&a_href_cc: Allow the case of undefined {""} - it is sometimes needed.
[MyWeb.git] / Web.pm
diff --git a/Web.pm b/Web.pm
index 524cf14..5bc71e0 100644 (file)
--- a/Web.pm
+++ b/Web.pm
@@ -1,6 +1,6 @@
 # $Id$
 # Common functions for HTML/XHTML output generation
-# Copyright (C) 2003 Jan Kratochvil <project-www.jankratochvil.net@jankratochvil.net>
+# Copyright (C) 2003-2005 Jan Kratochvil <project-www.jankratochvil.net@jankratochvil.net>
 # 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -24,17 +24,35 @@ use strict;
 use warnings;
 
 use Exporter;
-sub Wrequire ($);
-sub Wuse ($@);
+sub Wrequire($%);
+sub Wuse($@);
 our $W;
-our @EXPORT=qw(&Wrequire &Wuse &a_href &a_href_cz &vskip &img &centerimg &rightimg $W &top_dir &top_dir_disk);
-our @ISA=qw(Exporter);
+our @EXPORT=qw(
+               &Wrequire &Wuse
+               &path_web &path_abs_disk
+               &uri_escaped
+               &a_href &a_href_cc &text_cc
+               &vskip
+               &img &centerimg &rightimg &leftimg
+               $W
+               &input_hidden_persistents
+               &escapeHTML
+               &form_method
+               );
+our @ISA=qw(Tie::Handle Exporter);
+
+my %packages_used_hash;        # $packages_used_hash{$W->{"__PACKAGE__"}}{"_done"}=1;
+my %packages_used_array;
 
 BEGIN
 {
-       sub Wrequire ($)
+       use Carp qw(cluck confess);
+       $W->{"__My::Web_init"}=1;
+
+       # $args{"first"}=1
+       sub Wrequire ($%)
        {
-       my($file)=@_;
+       my($file,%args)=@_;
 
 #              print STDERR "Wrequire $file\n";
                $file=~s#/#::#g;
@@ -42,10 +60,26 @@ BEGIN
                my $class=$file;
                $file=~s#::#/#g;
                $file.=".pm";
-               my $aref=($W->{"packages_used"}{$Apache::Registry::curstash}||=[]);
-               push @$aref,$class
-                               if !{ map(($_=>1),@$aref) }->{$class};  # Prevent duplicated entries.
-               CORE::require $file;
+               my %callers;
+               for (my $depth=0;defined caller($depth);$depth++) {
+                       $callers{caller($depth)}=1;
+                       }
+               my $selfpkg=__PACKAGE__;
+               $callers{$selfpkg}=1;
+               for my $target ($class,__PACKAGE__) {
+                       for my $caller (keys(%callers)) {
+                               next if $packages_used_hash{$caller}{$target}++;
+                               cluck "Appending to the '_done' package list: caller=$caller,target=$target"
+                                               if $packages_used_hash{$caller}{"_done"};
+                               if ($args{"first"}) {
+                                       unshift @{$packages_used_array{$caller}},$target;
+                                       }
+                               else {
+                                       push @{$packages_used_array{$caller}},$target;
+                                       }
+                               }
+                       }
+               eval { CORE::require "$file"; } or confess $@;
                1;      # Otherwise 'require' would already file above.
        }
 
@@ -59,183 +93,545 @@ BEGIN
                $file->import(@list);
                1;
        }
+
+       sub import
+       {
+       my($class,@rest)=@_;
+
+               local $Exporter::ExportLevel=$Exporter::ExportLevel+1;
+               Wrequire("$class");
+               return $class->SUPER::import(@rest);
+       }
 }
 
-BEGIN { Wuse 'WebConfig'; }    # for %WebConfig
-require CGI;   # for &escapeHTML
+use WebConfig; # see also below: Wuse 'WebConfig';
 require Image::Size;   # for &imgsize
 use File::Basename;    # &basename
 use Carp qw(cluck confess);
 use URI::Escape;
 require HTTP::BrowserDetect;
 require HTTP::Negotiate;
-require Geo::IP;
-require CGI;
-
-
-# Undo 'www/engine/httpd-restart' as it may use obsolete Perl for 'mod_perl'
-delete $ENV{"PERLLIB"};
-delete $ENV{"LD_LIBRARY_PATH"};
+our $have_Geo_IP; BEGIN { $have_Geo_IP=eval { require Geo::IP; 1; }; }
+# Do not: use ModPerl::Util qw(exit);
+# to prevent in mod_perl2: "exit" is not exported by the ModPerl::Util module
+# I do not know why.
+use POSIX qw(strftime);
+use Tie::Handle;
+use Apache2::Const qw(HTTP_MOVED_TEMPORARILY OK HTTP_OK);
+use URI;
+use URI::QueryParam;
+use Cwd;
+require HTTP::Date;
+require Storable;
+require Digest::MD5;
+require Data::Compare;
+use Data::Dumper;
+require Encode;
+use Apache2::RequestUtil;
+use Apache2::Filter;
+use Apache2::Connection;
+require MIME::Base64;
+use Apache2::ServerUtil;
+require MIME::Types;
+require MIME::Parser;
+use Apache2::RequestRec;
+use Apache2::RequestIO;
+use Apache2::Response;
 
 
 #our $W;
-               # $W->{"title"}
-               # $W->{"head"}
-               # $W->{"head_css"}
-               # $W->{"force_charset"}
-               # %{$W->{"packages_used"}
-               # $W->{"heading_done"}
-               # $W->{"footer_passed"}
-               # %{$W->{"headers"}}
-               # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
-               # @{$W->{"packages_used"}{$Apache::Registry::curstash}}}
-               # %{$W->{"args"}}
 
 sub init ($%)
 {
 my($class,%args)=@_;
 
-       print STDERR "$class->init ".$ENV{"REQUEST_URI"}."\n";
-
-       my $packages_used_save=$W->{"packages_used"};
-       $W={ %WebConfig,%args };        # override %WebConfig settings
-       $W->{"packages_used"}=$packages_used_save;
-
-       $W->{"__PACKAGE__"}||="Apache::ROOT".$Apache::Registry::curstash;
-
-       $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
+       print STDERR "$class->init ".Apache2::RequestUtil->request()->unparsed_uri()."\n";
+
+       # We need to track package dependencies, so we need to call it from &init.
+       # We cannot do it in BEGIN { } block
+       # as it would not be tracked for each of the toplevel users later.
+       Wuse 'WebConfig';
+       Wrequire 'My::Hash';
+
+       # $W={} can get somehow created very easily.
+       # Do not: cluck "W not empty:\n".Dumper($W) if keys(%$W);
+       # to prevent (of $W->{"headers_in"}): TODO: Enumeration may not be expected.
+       cluck "W not empty; __PACKAGE__ was: ".$W->{"__PACKAGE__"} if keys(%$W);
+       $W=My::Hash->new({},"My::Hash::Sub","My::Hash::Push");
+       bless $W,$class;
+       %$W=(
+               "__PACKAGE__"=>scalar(caller()),
+               %WebConfig,
+               %args,  # override %WebConfig settings
+               );
 
-       do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
-       do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
-       do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
-       do { $W->{$_}=1  if !defined $W->{$_}; } for ("heading");
-       do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
-       do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
-       do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
-       do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
-       do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
-       do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
-       do { $W->{$_}="" if !defined $W->{$_}; } for ("head_css");
+       # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
+       # $Apache2::Registry::curstash is no longer supported.
+       do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
+       exit_hook_start();
+       # Package dependencies tracking only:
+       Wrequire $W->{"__PACKAGE__"},"first"=>1;
+
+       do { $W->{$_}=0  if !defined $W->{$_}; } for "detect_ent";
+       do { $W->{$_}=0  if !defined $W->{$_}; } for "detect_js";
+       do { $W->{$_}=1  if !defined $W->{$_}; } for "have_css";        # AFAIK it does not hurt anyone.
+       do { $W->{$_}=0  if !defined $W->{$_}; } for "css_inherit";
+       do { $W->{$_}=1  if !defined $W->{$_}; } for "footer";
+       do { $W->{$_}=1  if !defined $W->{$_}; } for "footer_delimit";
+       do { $W->{$_}=1  if !defined $W->{$_}; } for "footer_ids";
+       do { $W->{$_}=1  if !defined $W->{$_}; } for "indexme";
+       do { $W->{$_}="" if !defined $W->{$_}; } for "body_attr";
+       do { $W->{$_}="en-US" if !defined $W->{$_}; } for "language";
 
        my $footer_any=0;
-       for (qw(footer_mailme footer_ids)) {
+       for (qw(footer_ids)) {
                $W->{$_}=0 if !$W->{"footer"};
                $footer_any=1 if $W->{$_};
                }
        $W->{"footer"}=0 if !$footer_any;
        $W->{"footer_delimit"}=0 if !$W->{"footer"};
 
-       $W->{"r"}=Apache->request();
+       $W->{"r"}=Apache2::RequestUtil->request();
+
+       $W->{"r"}->push_handlers("PerlCleanupHandler"=>\&cleanup);
+
+       $W->{"web_hostname"}||=$W->{"r"}->hostname();
+
+       tie *STDOUT,$W->{"r"};
+       select *STDOUT;
+       $|=1;
+
+       $W->{"headers_in"}=$W->{"r"}->headers_in();
+       Wrequire 'My::Hash::Merge';
+       $W->{"headers_in"}=My::Hash::Merge->new(
+                       $W->{"headers_in"},
+                       My::Hash::Sub->new({
+                               "_remote_ip"=>sub { return $W->{"r"}->connection()->remote_ip(); },
+                               }),
+                       );
+       Wrequire 'My::Hash::Readonly';
+       $W->{"headers_in"}=My::Hash::Readonly->new($W->{"headers_in"});
+       
+       if ($W->{"r"}->method() eq "GET" || $W->{"r"}->method() eq "HEAD") {
+               for (\$W->{"http_safe"}) {
+                       # Do not: # Extend the current ETag system instead if you would need it:
+                       #         cluck "Explicitely NOT HTTP-Safe for method \"".$W->{"r"}->method()."\"?!?"
+                       #                       if defined($$_) && !$$_;
+                       # as sometimes it just does not make sense to cache it.
+                       $$_=1 if !defined $$_;
+                       }
+               }
+       else {
+               for (\$W->{"http_safe"}) {
+                       cluck "Undefined HTTP-Safe-ty for method \"".$W->{"r"}->method()."\"!"
+                                       if !defined($$_);
+                       $$_=0 if !defined $$_;
+                       }
+               }
+       # Used only if: $W->{"http_safe"}
+       # but we would cause on different method(): Appending to the '_done' package list
+       Wrequire 'My::Hash::RecordKeys';
+       if ($W->{"http_safe"}) {
+               $W->{"headers_in_RecordKeys"}=My::Hash::RecordKeys->new($W->{"headers_in"});
+               $W->{"headers_in"}=$W->{"headers_in_RecordKeys"};
+               }
 
-       $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
-          if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
-               { $W->{"have_ent"}=0; }
-       elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
-               { $W->{"have_ent"}=1; }
-       else
-               { delete $W->{"have_ent"}; }
-       if ($W->{"detect_ent"} && !defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
-               $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
-                               .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
-                                               ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
-                               .'" />'."\n";
-               }
-       $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
-       $W->{"r"}->args($W->{"QUERY_STRING"});
-       $ENV{"QUERY_STRING"}=$W->{"QUERY_STRING"};
-       # Do not: $W->{"r"}->args()
-       # as it parses only QUERY_STRING (not POST data).
-       $W->{"args"}={ CGI->new()->Vars() };
-       for (keys(%{$W->{"args"}})) {
-               my @vals=split /\x00/,$W->{"args"}{$_};
-               next if @vals<=1;
-               $W->{"args"}{$_}=[@vals];
-               }
-
-       do { $W->{$_}=$ENV{"HTTP_ACCEPT"} if !defined $W->{$_}; } for ("accept");
-       do { $W->{$_}=$ENV{"HTTP_USER_AGENT"} if !defined $W->{$_}; } for ("user_agent");
-
-       $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
+       {
+               local $_=$W->{"r"}->args() || "";
+               if ($W->{"detect_ent"}) {
+                                if (/[&]amp;have_ent/)
+                               { $W->{"have_ent"}=0; }
+                       elsif (    /[&]have_ent/)
+                               { $W->{"have_ent"}=1; }
+                       else
+                               { delete $W->{"have_ent"}; }
+                       if (!defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
+                               $W->{"head_push"}='<meta http-equiv="Refresh" content="0; URL='
+                                               .escapeHTML("http://".$W->{"web_hostname"}."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
+                                                               ."?".($_ || "detect_ent_glue=1").'&have_ent=detect')
+                                               .'" />'."\n";
+                               }
+                       }
+               s/([&])amp;/$1/g;
+               $W->{"r"}->args($_);
+               }
+
+       $W->{"args"}=URI->new("?".$W->{"r"}->args())->query_form_hash();
+       $W->merge_post_args() if $W->{"r"}->method() eq "POST";
+       # Prepare '$args' first to (FIXME: Why?) prevent: Not a reference
+       my $args=$W->{"args"};
+       $W->{"args_orig"}=Storable::dclone($args);
+
+       $W->{"browser"}=sub {
+               # Lazy-evaluation, we may not need the "User-Agent" header at all.
+               return our $r||=HTTP::BrowserDetect->new($W->{"headers_in"}{"User-Agent"});
+               };
 
        if (!defined $W->{"have_style"}) {
-               $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
+               $W->{"have_style"}=sub {
+                       # Lazy-evaluation, we may not need the "User-Agent" header at all.
+                       return our $r||=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
+                       };
                }
 
        $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
        if ($W->{"detect_js"} && !$W->{"have_js"}) {
-               $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
+               # Do not: <script />
+               # as at least Lynx inhibits any further HTML output.
+               # Do not: text/javascript
+               # as it does not look as registered, at least according to: MIME::Types $VERSION 1.15
+               # "application/javascript" so far standardized till 2005-12-08 by:
+               #       http://www.ietf.org/internet-drafts/draft-hoehrmann-script-types-03.txt
+               $W->{"head_push"}='<script type="application/javascript" src="'.uri_escaped(path_web('/My/HaveJS.pm')).'"></script>'."\n";
                }
 
-       do { args_check(%$_) if $_; } for ($W->{"args_check"});
+       # Required by &_args_check below.
+       $W->{"_init_done"}=1;
+
+       do { _args_check(%$_) if $_; } for $W->{"args_check"};
 
        return $W;
 }
 
-sub top_dir_disk ()
+sub form_method($)
 {
-       do { return $_ if $_; } for ($W->{"top_dir"});
-       return $INC[0]; # fallback
+my($method)=@_;
+
+       my $r=q{method="}.$method.q{"};
+       return $r." ".q{enctype="application/x-www-form-urlencoded" accept-charset="us-ascii utf-8"} if $method eq "post";
+       return $r." ".                                            q{accept-charset="us-ascii utf-8"} if $method eq "get";
+       cluck "Undefined method: $method";
+       return $r;
 }
 
-sub top_dir (;$)
+sub merge_post_args($)
 {
-my($in)=@_;
+my($class)=@_;
 
-       if (my $uri=$ENV{"REQUEST_URI"}) {
-               if ($W->{"args"}{"Wabs"}) {
-                       # FIXME: $in may not be defined here!
-                       # to prevent: Use of uninitialized value in ...
-                       if ($in=~m#^/#) {
-                               $in=~s#^/*##;
-                               }
-                       else {
-                               $in=$ENV{"REQUEST_URI"}."/".$in;
-                               $in=~tr#/#/#s;
-                               1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
-                               }
-                       return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
+       my @post_args=$class->read_post_args();
+       while (@post_args) {
+               my $name=shift @post_args;
+               my $data=shift @post_args;
+               my $ref=\$W->{"args"}{$name};
+                  if (!defined $$ref)       { $$ref=$data; }
+               elsif (!ref $$ref)           { $$ref=[$$ref,$data]; }
+               elsif ("ARRAY" eq ref $$ref) { push @$$ref,$data; }
+               else {
+                       cluck "Ignoring POST argument \"$name\", orig is weird:\n",Dumper($$ref);
                        }
-               $uri.="Index" if $uri=~m#/$#;
-               if (defined $in) {
-                       my($inpath,$inquery)=split /[?]/,$in,2;
-                       $inpath=~tr///cs;
-                       $uri=~tr///cs;
-                       for (;;) {
-                               my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
-                               my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
-                               last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
-                               $in=$in2;
-                               $uri=$uri2;
+               }
+       return;
+}
+
+# Do not: use CGI;
+# as CGI parsing of POST vs. QUERY_STRING data, multiple-valued keys etc.
+# is too dense and causes weird problems, together with mod_perl etc.
+sub read_post_args($)
+{
+my($class)=@_;
+
+       local $_=$class->http_headers_in_for("Content-type")->content_type();
+       return $class->read_multipart_form_data() if $_ eq "multipart/form-data";
+       return $class->read_application_x_www_form_urlencoded() if $_ eq "application/x-www-form-urlencoded";
+       cluck "Unknown POST data body, ignored: $_";
+       return;
+}
+
+sub read_application_x_www_form_urlencoded($)
+{
+my($class)=@_;
+
+       my $body="";
+       for (;;) {
+               my $got=$W->{"r"}->read(my($buf),0x1000);
+               # Do not: cluck "Error reading POST data: $!" if !defined $got;
+               # as it should be done using: APR::Error exceptions
+               last if !$got;
+               $body.=$buf;
+               }
+       return URI->new("?".$body)->query_form();
+}
+
+sub read_multipart_form_data($)
+{
+my($class)=@_;
+
+       my $parser=MIME::Parser->new();
+       # FIXME: No unlink()s done!
+       $parser->output_under("/tmp");
+
+       local *R_FH;
+       tie *R_FH,$W->{"r"};
+       local *FH;
+       tie *FH,"My::Web::ReadMerged",
+                       join("",map(($_.": ".$W->{"headers_in"}{$_}."\n"),qw(
+                                       Content-type
+                                       )))."\n",
+                       \*R_FH;
+       my $body=$parser->parse(\*FH);
+       cluck "No multipart POST request body?" if !$body->is_multipart();
+
+       return map((
+                       $_->head()->mime_attr("content-disposition.name")
+                       =>
+                       join("",@{$_->body()})
+                       ),$body->parts());
+
+       # TODO: Globalize, make it IO::* compatible, split to the merging part + IO::Scalar.
+       package My::Web::ReadMerged;
+
+       require Tie::Handle;
+       require Exporter;
+       our @ISA=qw(Tie::Handle Exporter);
+       use Carp qw(cluck confess);
+
+       sub READLINE($)
+       {
+       my($self)=@_;
+
+               confess "Slurp not yet implemented" if !defined $/;
+               # Apache2::RequestIO does not support 'READLINE'!
+               for (;;) {
+                       if (defined $self->{"data"} && $self->{"data"}=~s{^.*\Q$/\E}{}) {
+                               $self->{"offset"}+=length $&;
+                               return $&;
+                               }
+                       my $fh_orig=$self->{"fh_orig"};
+                       if (!$fh_orig) {
+                               my $r=$self->{"data"};
+                               delete $self->{"data"};
+                               $self->{"offset"}+=length $r if defined $r;
+                               return $r;
                                }
+                       my $got=read $fh_orig,my($buf),0x1000;
+                       cluck "Error reading POST data: $!" if !defined $got;
+                       delete $self->{"fh_orig"} if !$got;
+                       cluck "INTERNAL: fh_orig should not exist here" if !defined $self->{"data"};
+                       $self->{"data"}.=$buf;
                        }
-               $uri=~s#^/*##;
-               $uri=~s#[^/]+#..#g;
-               $uri=File::Basename::dirname($uri);
-               my $r=$uri.(defined $in ? $in : "");
-#              1 while $r=~s#^[.]/##;
-#              $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
-               return $r;
+       }
+
+       sub TELL($)
+       {
+       my($self)=@_;
+
+               return $self->{"offset"};
+       }
+
+       sub TIEHANDLE($$$)
+       {
+       my($class,$data,$fh_orig)=@_;
+
+               my $self=bless {},$class;
+               $self->{"data"}=$data;
+               $self->{"offset"}=0;
+               $self->{"fh_orig"}=$fh_orig;
+               return $self;
+       }
+}
+
+sub cleanup($)
+{
+my($apache_request)=@_;
+
+       cluck "CORE::GLOBAL::exit hook not ran" if !$W->{"_exit_done"};
+       cluck "packages not finalized" if !$packages_used_hash{$W->{"__PACKAGE__"}}{"_done"};
+       cache_finish();
+       # Sanity protection.
+       $W=undef();
+       exit_hook_stop();
+       return OK;
+}
+
+# PerlResponseHandler is RUN_FIRST and &ModPerl::Util::exit returns OK, so no (sane) go.
+# PerlLogHandler is already too late to be able to produce any output.
+my $exit_orig;
+sub exit_hook
+{
+       cluck "Missing ->init while in exit_hook()" if !$W->{"_init_done"};
+       # &footer will call us recursively!
+       footer() if !$W->{"_exit_done"}++;
+       return &{$exit_orig}(@_);
+}
+sub exit_hook_start
+{
+       do { cluck "exit_hook_start() twice?"; return; } if defined $exit_orig;
+       $exit_orig=\&CORE::GLOBAL::exit;
+       # Prevent: Subroutine CORE::GLOBAL::exit redefined
+       no warnings 'redefine';
+       *CORE::GLOBAL::exit=\&exit_hook;
+}
+sub exit_hook_stop
+{
+       do { cluck "exit_hook_stop() without exit_hook_start()?"; return; }
+                       if \&exit_hook ne \&CORE::GLOBAL::exit;
+       do { cluck "INTERNAL: exit_orig uninitialized"; return; }
+                       if !$exit_orig;
+       # Prevent: Subroutine CORE::GLOBAL::exit redefined
+       no warnings 'redefine';
+       *CORE::GLOBAL::exit=$exit_orig;
+       $exit_orig=undef();
+}
+
+# Be aware other parts of code (non-My::Web) will NOT use this function!
+# Do not: Wprint $W->{"heading"},"undef"=>1;
+# as we would need to undef() it to turn it off and it would get defaulted in such case.
+# Do not: exists $W->{"heading"}
+# as we use a lot of 'for $W->{"heading"}' which instantiates it with the value: undef()
+sub Wprint($%)
+{
+my($text,%args)=@_;
+
+       cluck "undef Wprint" if !defined $text && !$args{"undef"};
+       delete $args{"undef"};
+       cluck join(" ","Invalid arguments:",keys(%args)) if keys(%args);
+       return if !defined $text;
+       # Do not: cluck "utf-8 untested" if Encode::is_utf8($text);
+       # as it is valid here.
+       $W->{"r"}->puts($text);
+}
+
+sub request_check(;$)
+{
+my($self)=@_;
+
+       # Use &eval to prevent: Global $r object is not available. Set:\n\tPerlOptions +GlobalRequest\nin ...
+       confess "Calling sensitive dynamic code from a static code" if !eval { Apache2::RequestUtil->request(); };
+       # Do not: confess "Calling sensitive dynamic code without My::Web::init" if !$W->{"__PACKAGE__"};
+       # as it is valid at least while preparing arguments to call: &project::Lib::init
+}
+
+# Do not: use CGI;
+# as it is too much backward compatible regarding the charset encodings etc.
+# and the resulting code is too dense with no additional functionality for the recent content.
+sub escapeHTML($)
+{
+my($text)=@_;
+
+       local $_=$text;
+       s{&}{&amp;}gso;
+       s{<}{&lt;}gso;
+       s{>}{&gt;}gso;
+       s{"}{&quot;}gso;
+       return $_;
+}
+
+# /home/user/www/webdir
+sub dir_top_abs_disk()
+{
+       our $dir_top_abs_disk;
+       if (!$dir_top_abs_disk) {
+               my $selfpkg_relpath=__PACKAGE__;
+               $selfpkg_relpath=~s{::}{/}g;
+               $selfpkg_relpath.=".pm";
+               my $selfpkg_abspath=$INC{$selfpkg_relpath} or do {
+                       cluck "Unable to find self package $selfpkg_relpath";
+                       return;
+                       };
+               $selfpkg_abspath=~s{/*\Q$selfpkg_relpath\E$}{} or do {
+                       cluck "Unable to strip myself \"$selfpkg_relpath\" from the abspath: $selfpkg_abspath";
+                       return;
+                       };
+               cluck "INC{myself} is relative?: $selfpkg_abspath" if $selfpkg_abspath!~m{^/};
+               $dir_top_abs_disk=$selfpkg_abspath;
+               }
+       return $dir_top_abs_disk;
+}
+
+sub unparsed_uri()
+{
+       request_check();
+       if (!$W->{"unparsed_uri"}) {
+               # Do not: $W->{"r"}
+               # as we may be called before &init from: &My::Project::init
+               my $r=Apache2::RequestUtil->request();
+               cluck "Calling ".'&unparsed_uri'." from a static code, going to fail" if !$r;
+               my $uri_string=$r->unparsed_uri() or cluck "Valid 'r' missing unparsed_uri()?";
+               my $uri=URI->new_abs($uri_string,"http://".$W->{"web_hostname"}."/");
+               $W->{"unparsed_uri"}=$uri;
+               }
+       return $W->{"unparsed_uri"};
+}
+
+sub in_to_uri_abs($)
+{
+my($in)=@_;
+
+       # Otherwise we may have been already processed and thus legally relativized.
+       # FIXME data: Currently disabled, all the data are too violating such rule.
+       if (0 && !ref $in) {
+               my $uri_check=URI->new($in);
+               $uri_check->scheme() || $in=~m{^\Q./\E} || $in=~m{^/}
+                               or cluck "Use './' or '/' prefix for all the local references: $in";
+               }
+       my $uri=URI->new_abs($in,unparsed_uri());
+       $uri=$uri->canonical();
+       return $uri;
+}
+
+# $args{"uri_as_in"}=1 to permit passing URI objects as: $in
+# $args{"abs"}=1;
+sub path_web($%)
+{
+my($in,%args)=@_;
+
+       cluck if !$args{"uri_as_in"} && ref $in;
+       my $uri=in_to_uri_abs($in);
+       if (uri_is_local($uri)) {
+               # Prefer the $uri values over "args_persistent" values.
+               # &query_form_hash comes from: URI::QueryParam
+               $uri->query_form_hash({
+                               map({
+                                       my $key=$_;
+                                       my $val=$W->{"args"}{$key};
+                                       (!defined $val ? () : ($key=>$val));
+                                       } keys(%{$W->{"args_persistent"}})),
+                               %{$uri->query_form_hash()},
+                               });
                }
-       return top_dir_disk().$in;
+       return $uri->abs(unparsed_uri()) if $W->{"args"}{"Wabs"} || $args{"abs"};
+       return $uri->rel(unparsed_uri());
+}
+
+sub path_abs_disk_register($)
+{
+my($path_abs_disk)=@_;
+
+       $W->{"path_abs_disk_register"}{$path_abs_disk}=1;
+}
+
+# $args{"uri_as_in"}=1 to permit passing URI objects as: $in
+sub path_abs_disk($%)
+{
+my($in,%args)=@_;
+
+       cluck if !$args{"uri_as_in"} && ref $in;
+       my $uri=in_to_uri_abs($in);
+       cluck if !uri_is_local($uri);
+       my $path=$uri->path();
+       cluck "URI compatibility: ->path() not w/leading slash of URI \"$uri\"; path: $path" if $path!~m{^/};
+       my $r=dir_top_abs_disk().$path;
+       path_abs_disk_register $r if !defined $args{"register"} || $args{"register"};
+       return $r;
 }
 
 sub fatal (;$);
 
-sub args_check (%)
+sub _args_check (%)
 {
 my(%tmpl)=@_;
 
        while (my($name,$regex)=each(%tmpl)) {
-               my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
+               my $name_html="Parameter <span class=\"quote\">".escapeHTML($name)."</span>";
                $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
                $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
                fatal "$name_html passed as multivar although singlevar expected"
                                if ref $W->{"args"}{$name} && !ref $regex;
-               $regex=${$regex}[0] if ref $regex;
+               $regex=$regex->[0] if ref $regex;
                for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
                        $val="" if !defined $val;
-                       fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
-                                                       ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
+                       fatal "$name_html <span class=\"quote\">".escapeHTML($val)."</span>"
+                                                       ." does not match the required regex <span class=\"quote\">".escapeHTML($regex)."</span> "
                                        if $regex ne "" && $val!~/$regex/;
                        }
                }
@@ -253,44 +649,60 @@ sub fatal (;$)
 my($msg)=@_;
 
        $msg="UNKNOWN" if !$msg;
-
-       $W->{"indexme"}=0;      # For the case no heading was sent yet.
-       My::Web->heading();
-       print "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
+       cluck "FATAL: $msg";
+
+       # Do not send it unconditionally.
+       # The intial duplicated '<?xml...' crashes Gecko parser.
+       $W->{"heading_done"}=0 if $W->{"header_only"};
+       # Do not send it unconditionally.
+       # Prevents warn: Headers already sent
+       if (!$W->{"heading_done"}) {
+               $W->{"indexme"}=0;      # For the case no heading was sent yet.
+               $W->{"header_only"}=0;  # assurance for &heading
+               $W->{"content_type"}="text/html";       # Force HTML and avoid strictly checked XHTML.
+               My::Web->heading();
+               }
+       Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
                        ."<p>You can report this problem's details to"
                        ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
-       footer();
+       exit;
 }
 
-sub footer (;$)
+sub footer_packages_used_comments()
 {
-       exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
-
-       print vskip if $W->{"footer_delimit"};
+       my $packages_used=$packages_used_array{$W->{"__PACKAGE__"}};
+       for my $package (@$packages_used) {
+               my $cvs_id=(eval('$'.$package."::CVS_ID")
+#                              || $package     # debug
+                               );
+               Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
+               }
+}
 
-       if ($W->{"heading"}) {
-               do { &{$_}() if $_; } for ($W->{"footing_delimit"});
+sub footer()
+{
+       cluck 'Explicit &footer call is deprecated, !_exit_dne' if !$W->{"_exit_done"};
+       exit if $W->{"footer_done"}++;  # deadlock prevention:
+       &{$_}() for reverse @{$W->{"footer_sub_push"}};
+       if ($W->{"header_only"}) {
+               $packages_used_hash{$W->{"__PACKAGE__"}}{"_done"}=1;
+               exit;
                }
 
-       print "<hr />\n" if $W->{"footer"};
+       Wprint vskip if $W->{"footer_delimit"};
+       &{$_}() for reverse @{$W->{"footing_delimit_sub_push"}};
+       Wprint "<hr />\n" if $W->{"footer"};
 
-       if ($W->{"footer_mailme"}) {
-               print '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
-                               ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
-                               ."this.elements['msghtml'].value='';"
-                               ."this.submit();"
-                               .'">'."\n";
-                       print '<p align="right">'."\n";
-                               print '<input name="msgscript" type="hidden" />'."\n";
-                               print '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
-                               print '<input name="submit" type="submit" value="Quick Note" />'."\n";
-                       print '</p>'."\n";
-               print '</form>'."\n";
-               }
+       # Never update the package list while we examine it!
+       $packages_used_hash{$W->{"__PACKAGE__"}}{"_done"}=1;
+
+       # Dump the whole packages stack or just the primary one?
+       #my $packages_used=$packages_used_array{$W->{"__PACKAGE__"}};
+       my $packages_used=[$W->{"__PACKAGE__"}];
 
        if ($W->{"footer_ids"}) {
-               print '<p class="cvs-id">';
-               print join("<br />\n",map({ my $package=$_;
+               Wprint '<p class="cvs-id">';
+               Wprint join("<br />\n",map({ my $package=$_;
                        my $cvs_id=(eval('$'.$package."::CVS_ID")
 #                                      || $package     # debug
                                        );
@@ -304,62 +716,50 @@ sub footer (;$)
                                        my $file=$package;
                                        $file=~s#::#/#g;
                                        my $ext;
-                                       for (qw(.html.pl .pl .pm),"") {
+                                       my @tried;
+                                       for (qw(.pm)) {
                                                $ext=$_;
-                                               last if -r top_dir_disk()."/$file$ext";
-                                               cluck "Class file $file not found" if !$ext;
+                                               my $path_abs_disk=path_abs_disk("/$file$ext");
+                                               push @tried,$path_abs_disk;
+                                               last if -r $path_abs_disk;
+                                               cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
                                                }
                                        $file.=$ext;
+                                       my $viewcvs;
+                                       if ((my $file_cvs=$file)=~s{^My/}{}) {
+                                               $viewcvs=$W->{"viewcvs_My"}.$file_cvs;
+                                               }
+                                       else {
+                                               $viewcvs=$W->{"viewcvs"}.$file;
+                                               }
                                        $cvs_id_split[2]=""
-                                                       .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
+                                                       .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $viewcvs))[0]."?rev=".$cvs_id_split[2],
                                                                        $cvs_id_split[2]);
-                                       # FIXME: Use 'CVS/Repository' here.
-                                       my $viewcvs=$W->{"viewcvs"};
-                                       $viewcvs=~s#(/viewcvs)/.*$#$1/MyWeb/# if $file=~s#^My/##;
-                                       $cvs_id_split[1]=a_href($viewcvs.$file,
-                                                       ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
-                                       $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
+                                       $cvs_id_split[1]=a_href($viewcvs,($package!~/^Apache2::/ ? $package : $cvs_id_split[1]));
+                                       $cvs_id_split[5]=&{$W->{"cvs_id_author_sub"}}($cvs_id_split[5]);
                                        }
                                join " ",@cvs_id_split;
                                }
-                       } (
-                                       $W->{"__PACKAGE__"},
-                                       __PACKAGE__,
-                                       @{$W->{"packages_used"}{$Apache::Registry::curstash}},
-                                       )));
-               print "</p>\n";
+                       } @$packages_used));
+               Wprint "</p>\n";
                }
 
-       for my $package (
-                       $W->{"__PACKAGE__"},
-                       __PACKAGE__,
-                       @{$W->{"packages_used"}{$Apache::Registry::curstash}},
-                       ) {
-               my $cvs_id=(eval('$'.$package."::CVS_ID")
-#                              || $package     # debug
-                               );
-               print '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
-               }
+       footer_packages_used_comments();
 
-       if ($W->{"heading"}) {
-               do { &{$_}() if $_; } for ($W->{"footing"});
-               }
+       do { Wprint $_ if $_; } for $W->{"footing"};
 
-       print "</body></html>\n";
-       exit(0);
+       Wprint "</body></html>\n";
+       exit;
 }
 
-sub header (%)
+# Existing entries are overwritten.
+sub header(%)
 {
 my(%pairs)=@_;
 
        while (my($key,$val)=each(%pairs)) {
                do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
-               for ($W->{"headers_lc"}{lc $key} || ()) {
-                       delete $W->{"headers"}{$_};
-                       }
-               $W->{"headers_lc"}{lc $key}=$key;
-               $W->{"headers"}{$key}=$val;
+               $W->{"r"}->headers_out()->set($key,$val);
                }
 }
 
@@ -377,90 +777,184 @@ my($size)=@_;
        return $size;
 }
 
-sub url_is_local ($)
+sub uri_is_local($)
 {
-my($url)=@_;
+my($in)=@_;
 
-       return $url!~m#^[a-z]+://#;
+       my $uri_rel=in_to_uri_abs($in)->rel(unparsed_uri());
+       # Do not: defined $uri_rel->("userinfo"|"host"|"port")();
+       # as they fail to be called for schemes not supporting them.
+       return 0 if $uri_rel->scheme();
+       return 0 if $uri_rel->authority();
+       return 1;
 }
 
-sub a_href ($;$%)
+# &path_web still may be required for &uri_escaped !
+sub uri_escaped($)
 {
-my($url,$contents,%args)=@_;
+my($uri)=@_;
+
+       cluck if !ref $uri;
+       my $urient=escapeHTML($uri);
+       return $uri    if $uri eq $urient;
+       request_check();
+       return $urient if uri_is_local $uri;
+       return $uri    if defined $W->{"have_ent"} && !$W->{"have_ent"};        # non-ent client
+       return $urient if $W->{"have_ent"};     # ent client
+       # Unknown client, &escapeHTML should not be needed here:
+       return escapeHTML(path_web('/My/Redirect.pm?location='.uri_escape($uri->abs(unparsed_uri()))));
+}
+
+our $a_href_inhibited;
+sub a_href($;$%)
+{
+my($in,$contents,%args)=@_;
 
+       request_check();
        do { $$_=1 if !defined $$_; } for (\$args{"size"});
        if (!defined $contents) {
-               $contents=$url;
+               $contents=$in;
                $contents=File::Basename::basename($contents) if $args{"basename"};
-               $contents=CGI::escapeHTML($contents);
+               $contents=~s/^mailto:([-.\w]+@[-.\w]+)$/$1/;
+               $contents=escapeHTML($contents);
                }
        $contents=~s#<a\b[^>]*>##gi;
        $contents=~s#</a>##gi;
+       return $contents if $a_href_inhibited;
 
-       $url=top_dir($url) if url_is_local $url && $url=~m#^/#;
-
-       my $r='<a href="';
-       my $urlent=CGI::escapeHTML($url);
-          if ($url eq $urlent)
-               { $r.=$url; }
-       elsif (url_is_local $url)
-               { $r.=$urlent; }
-       elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
-               { $r.=$url; }
-       elsif ($W->{"have_ent"})        # ent client
-               { $r.=$urlent; }
-       else    # unknown client, &CGI::escapeHTML should not be needed here
-               { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
+       my $path_web=path_web $in,%args;
+       my $r="";
+       $r.='<a href="';
+       $r.=uri_escaped $path_web;
        $r.='"';
        do { $r.=" $_" if $_; } for ($args{"attr"});
        $r.='>'.$contents.'</a>';
-       if ($args{"size"} && url_is_local($url) && ($args{"size"}>=2 || $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) { # Downloadable?
-               $url=top_dir_disk().$url if $url=~m#^/#;
-               if (!-r $url)
-                       { cluck "File not readable: $url"; }
-               else {
-                       $r.='&nbsp;('.size_display((stat($url))[7]).')';
-                       }
+       if ($args{"size"} && uri_is_local($in) && ($args{"size"}>=2 || $in=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) {   # Downloadable?
+               my $path_abs_disk=path_abs_disk $in,%args;
+               cluck "File not readable: $path_abs_disk" if !-r $path_abs_disk;
+               $r.='&nbsp;('.size_display((stat($path_abs_disk))[7]).')';
                }
        return $r;
 }
 
+sub a_href_inhibit($$;@)
+{
+my($self,$sub,@sub_args)=@_;
+
+       local $a_href_inhibited=1;
+       return &{$sub}(@sub_args);
+}
+
+sub input_hidden_persistents()
+{
+       request_check();
+       return join("",map({
+               my $key=$_;
+               my $val=$W->{"args"}{$key};
+               (!defined $val ? () : '<input type="hidden"'
+                               .' name="'.escapeHTML($key).'"'
+                               .' value="'.escapeHTML($val).'"'
+                               .' />'."\n");
+               } (keys(%{$W->{"args_persistent"}}))));
+}
+
+sub http_moved($$;$)
+{
+my($self,$url,$status)=@_;
+
+       $url=path_web($url,"abs"=>1);
+       $status||=HTTP_MOVED_TEMPORARILY;
+       $W->{"r"}->status($status);
+       $W->{"r"}->headers_out()->{"Location"}=$url;
+       $W->{"header_only"}=1;
+       $W->{"content_type"}=0;
+       $W->{"charset"}=0;
+       My::Web->heading();
+       exit;
+       die "NOTREACHED";
+}
+
 sub remote_ip ()
 {
-       # Do not: PerlModule                 Apache::ForwardedFor
-       #         PerlPostReadRequestHandler Apache::ForwardedFor
-       # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
+       # Do not: PerlModule                 Apache2::ForwardedFor
+       #         PerlPostReadRequestHandler Apache2::ForwardedFor
+       # As 'Apache2::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
        # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
        # We must take the last item ourselves.
-       my $r=$ENV{"HTTP_X_FORWARDED_FOR"} || $W->{"r"}->get_remote_host();
-       $r=~s/^.*,\s*//;
+       # Be VERY sure you always retrieve all the headers unconditionally to hit: My::Hash::RecordKeys
+       my $x_forwarded_for=$W->{"headers_in"}{"X-Forwarded-For"};
+       $x_forwarded_for=~s/^.*,\s*// if $x_forwarded_for;
+       my $remote_ip=$W->{"headers_in"}{"_remote_ip"};
+       my $r;
+       $r||=$x_forwarded_for;
+       $r||=$remote_ip;
        return $r;
 }
 
-sub is_cz ()
+sub _cc()
 {
-       return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
+       my $r;
+       $r||=Geo::IP->new()->country_code_by_addr(remote_ip()) if $have_Geo_IP;
+       $r||="";
+       return $r;
 }
 
-sub a_href_cz ($$;%)
+# $url={"JP"=>"http://specific",...};
+# $url={""=>"http://default",...};
+sub a_href_cc($$;%)
 {
 my($url,$contents,%args)=@_;
 
-       return a_href $url,$contents,%args if is_cz();
+       # A bit ineffective but we must process all the possibilities to get stable 'headers_in' hits!
+       my %map=map(($_=>a_href($url->{$_},$contents,%args)),keys(%$url));
+       my $r;
+       $r||=$map{_cc()};
+       $r||=$map{""};
+       return $r if $r;
        return $contents;
 }
 
+# $tree={"JP"=>"specific",...};
+# $tree={""=>"default",...};
+sub text_cc($)
+{
+my($tree)=@_;
+
+       cluck if !$tree->{""};
+       my $r;
+       $r||=$tree->{_cc()};
+       $r||=$tree->{""};
+       return $r;
+}
+
 sub make ($)
 {
 my($cmd)=@_;
 
-       system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
+       # FIXME: &alarm, --timeout is now infinite.
+       # FIXME: Try to remove bash(1).
+       # FIXME: Use: @PATH_FLOCK@
+       my @argv=('flock',dir_top_abs_disk(),'bash','-c',$cmd.' >&2');
+       print STDERR join(" ","SPAWN:",@argv)."\n";
+       system @argv;
+}
+
+sub make_file($$)
+{
+my($self,$file)=@_;
+
+       cluck "Pathname not absolute: $file" if $file!~m{^/};
+       return if -f $file;
+       # TODO: Somehow quickly check dependencies?
+       return make('make -s --no-print-directory'
+                                       .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'");
 }
 
 sub img_size ($$)
 {
 my($width,$height)=@_;
 
+       cluck if !defined $width || !defined $height;
        return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
                        ." width=\"$width\" height=\"$height\"";
 }
@@ -473,76 +967,122 @@ my(%args)=@_;
        return [ map(($args{$_}),@fields) ];
 }
 
-my @img_variants=(
-               { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
-               { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
-               );
-my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
-
-sub img_src ($)
+# Returns: 'HTTP::Headers' instance.
+sub http_headers_in_for($@)
 {
-my($file_base)=@_;
+my($self,@headers)=@_;
 
-       if (!url_is_local($file_base)) {
-               return $file_base if !wantarray();
-               return ($file_base,$file_base);
-               }
-       # Known image extension?
-       if ($file_base=~m#$img_variants_re#o) {
-               return $file_base if !wantarray();
-               return ($file_base,$file_base) if $file_base!~m#^/#;
-               return (top_dir($file_base),top_dir_disk().$file_base);
-               }
+       # Limit these entries to generate proper 'Vary' header.
+       return HTTP::Headers->new(map(($_=>$W->{"headers_in"}{$_}),@headers));
+}
 
-       my $file_base_disk;
-       my $file_base_uri;
-       if ($file_base!~m#^/#) {
-               $file_base_disk=$file_base_uri=$file_base;
-               }
-       else {
-               $file_base_disk=top_dir_disk().$file_base;
-               $file_base_uri=top_dir($file_base);
-               }
-
-       my @nego_variants;
-       for my $var (@img_variants) {
-               my $file=$file_base_disk.".".$var->{"id"};
-               # TODO: Somehow quickly check dependencies?
-               make('make -s --no-print-directory'
-                                               .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
-                               if !-f $file;
-               push @nego_variants,negotiate_variant(
-                               %$var,
-                               "size"=>(stat $file)[7],
-                               );
+# Input: $self is required!
+# Input: Put the fallback variant as the first one.
+# Returns: always only scalar!
+sub Negotiate_choose($$)
+{
+my($self,$variants)=@_;
+
+       my $best=HTTP::Negotiate::choose($variants,
+                       # Do not: $W->{"r"}
+                       # to prevent: Can't locate object method "scan" via package "Apache2::RequestRec" at HTTP/Negotiate.pm line 84.
+                       # Do not: $W->{"r"}->headers_in()
+                       # to prevent: Can't locate object method "scan" via package "APR::Table" at HTTP/Negotiate.pm line 84.
+                       # Do not: HTTP::Headers->new($W->{"r"}->headers_in());
+                       # to prevent empty result or even: Odd number of elements in anonymous hash
+                       $self->http_headers_in_for(qw(
+                                       Accept
+                                       Accept-Charset
+                                       Accept-Encoding
+                                       Accept-Language
+                                       )));
+       $best||=$variants->[0][0];      # $variants->[0]{"id"}; &HTTP::Negotiate::choose failed?
+       return $best;
+}
+
+# FIXME: Use for "content-type": MIME::Types
+my @img_variants=(
+       { "id"=>"svg","qs"=>0.9,"content-type"=>"image/svg+xml" },
+       { "id"=>"png","qs"=>0.8,"content-type"=>"image/png" },
+       { "id"=>"gif","qs"=>0.7,"content-type"=>"image/gif" },
+       # Do not prefer these to avoid fedding them for '*/*' browsers.
+       { "id"=>"dia","qs"=>0.6,"content-type"=>"application/x-dia-diagram" },
+       { "id"=>"fig","qs"=>0.6,"content-type"=>"image/x-xfig" },
+       { "id"=>"fig","qs"=>0.6,"content-type"=>"application/x-xfig" },
+       { "id"=>"sxd","qs"=>0.6,"content-type"=>"application/vnd.sun.xml.draw" },
+       { "id"=>"sxi","qs"=>0.6,"content-type"=>"application/vnd.sun.xml.impress" },
+       );
+# Unsupported by Image::Size 2.992: sxd sxi dia
+#   Supported by Image::Size 2.992: fig png gif jpeg
+#   Expensive by Image::Size 2.992: svg
+my %img_map=(
+       "svg" =>[qw(png gif)],  # svg
+       "png" =>[qw(png gif)],
+       "jpeg"=>[qw(jpeg)],
+       "dia" =>[qw(png gif)],  # svg
+       "fig" =>[qw(fig png gif)],
+       "sxd" =>[qw(png gif)],
+       "sxi" =>[qw(png gif)],
+       );
+
+# Returns: ($path_web,$path_abs_disk)
+# URI path segments support ignored here. Where it is used? (';' path segment options)
+sub _img_src($%)
+{
+my($in,%args)=@_;
+
+       cluck if !uri_is_local $in;
+       my $uri=in_to_uri_abs $in;
+       my $path_abs_disk=path_abs_disk $uri,%args,"uri_as_in"=>1,"register"=>0;
+
+       cluck "Not exists image path_abs_disk: $path_abs_disk" if !-r $path_abs_disk;
+       my($path_abs_disk_base,$ext_orig)=($path_abs_disk=~/^(.*)[.](\w+)$/) or cluck;
+       my $map_arrayref=$img_map{$ext_orig} or cluck;
+
+       my $ext=$ext_orig;
+       if (1!=@$map_arrayref) {
+               my @nego_variants;
+               for my $ext (@$map_arrayref) {
+                       my $path_abs_disk_variant=$path_abs_disk_base.".".$ext;
+                       path_abs_disk_register($path_abs_disk_variant);
+                       __PACKAGE__->make_file($path_abs_disk_variant);
+                       for my $var (@img_variants) {
+                               next if $var->{"id"} ne $ext;
+                               push @nego_variants,negotiate_variant(
+                                               %$var,
+                                               "size"=>(stat $path_abs_disk_variant)[7],
+                                               );
+                               }
+                       }
+               $ext=__PACKAGE__->Negotiate_choose(\@nego_variants);
                }
-       # Do not: ,$W->{"r"});
-       # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
-       my $ext=HTTP::Negotiate::choose(\@nego_variants);
-       $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 
-       return $file_base_uri.".".$ext if !wantarray();
-       return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
+       my $uri_path=$uri->path();
+       $uri_path=~s/\Q.$ext_orig\E$/.$ext/ or cluck;
+       $uri->path($uri_path);
+       return path_web($uri,%args,"uri_as_in"=>1),path_abs_disk($uri,%args,"uri_as_in"=>1);
 }
 
-sub img ($$;%)
+# $args{"attr"}
+sub img ($$%)
 {
-my($file_base,$alt,%attr)=@_;
+my($in,$alt,%args)=@_;
 
-       my($file_uri,$file_disk)=img_src $file_base;
-       my($width,$height)=Image::Size::imgsize($file_disk);
+       request_check();
+       my($path_web,$path_abs_disk)=_img_src($in,%args);
+       my($width,$height)=Image::Size::imgsize($path_abs_disk);
        $alt=~s/<[^>]*>//g;
-       $alt=CGI::escapeHTML($alt);
-       my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
-                       .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
-       return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
-       return a_href $attr{"a_href"},$content if $attr{"a_href"};
+       $alt=escapeHTML($alt);
+       my $content="<img src=\"".uri_escaped($path_web)."\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
+                       .(!$args{"attr"} ? "" : " ".$args{"attr"})." />";
+       do { return a_href((_img_src($_))[0],$content,"uri_as_in"=>1) if $_; } for $args{"a_href_img"};
+       do { return a_href $_,$content if $_; } for $args{"a_href"};
        return $content;
 }
 
 sub centerimg
 {
-       my $r.="";
+       my $r="";
        $r.='<table border="0" width="100%"><tr>'."\n";
        @_=( [@_] ) if !ref $_[0];
        for (@_) {
@@ -552,121 +1092,388 @@ sub centerimg
        return $r;
 }
 
+# Optional: Provide 'text' as 1==@args_img item.
 sub rightimg
 {
 my($text,@args_img)=@_;
 
-       # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
+       # FIXME: Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
+       #        <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
+       #        <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
+       # causes whole invisible projects in: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050719 Galeon/1.3.21
        return <<"HERE";
-<table border="0" width="100%">
-       <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
-       <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
+<table border="0" width="100%" class="textimg">
        <tr>
                <td align="left">
                        @{[ $text ]}
                </td>
+               <td>&nbsp;&nbsp;</td>
                <td align="right">
-                       @{[ &{\&img}(@args_img) ]}
+                       @{[ 1==@args_img ? $args_img[0] : &{\&img}(@args_img) ]}
                </td>
        </tr>
 </table>
 HERE
 }
 
-sub readfile ($$)
+# Optional: Provide 'text' as 1==@args_img item.
+sub leftimg
+{
+my($text,@args_img)=@_;
+
+       # FIXME: Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
+       #        <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
+       #        <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
+       # causes whole invisible projects in: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050719 Galeon/1.3.21
+       return <<"HERE";
+<table border="0" width="100%">
+       <tr>
+               <td align="center">
+                       @{[ 1==@args_img ? $args_img[0] : &{\&img}(@args_img) ]}
+               </td>
+               <td>&nbsp;&nbsp;</td>
+               <td align="left">
+                       @{[ $text ]}
+               </td>
+       </tr>
+</table>
+HERE
+}
+
+sub readfile($$)
 {
 my($class,$filename)=@_;
 
        local *F;
-       open F,$filename or die "Cannot open \"$filename\": $!";
-       local $/=undef();
-       my $data=<F>;
-       close F;
-       return $data;
+       open F,$filename or cluck "Cannot open \"$filename\": $!";
+       my $F=do { local $/=undef(); <F>; };
+       close F or cluck "Cannot close \"$filename\": $!";
+       return $F;
 }
 
-sub arr_keys (@)
+sub _no_cache($)
 {
-my(@arr)=@_;
+my($self)=@_;
+
+       header("Expires"=>HTTP::Date::time2str(1000000000));    # date in the past
+       header("Last-Modified"=>HTTP::Date::time2str());        # always modified
+       header("Cache-Control"=>join(", ",
+                       "no-cache",
+                       "no-store",
+                       "must-revalidate",
+                       "max-age=0",
+                       "pre-check=0",  # MSIE
+                       "post-check=0", # MSIE
+                       ));     # HTTP/1.1
+       header("Pragma"=>"no-cache");   # HTTP/1.0
+       header("Vary"=>"*");    # content may ba based on unpredictable sources
+}
+
+sub headers_in_filtered(@)
+{
+my(@keys)=@_;
+
+       return map(($_=>$W->{"headers_in"}{$_}),@keys);
+}
+
+our %uri_args_frozen_to_headers_in_keys;
+our %uri_args_headers_in_frozen_to_headers_out;
+
+sub uri_args_headers_in_frozen_get($)
+{
+my($headers_in_keys_arrayref)=@_;
 
-       my @r=();
-       while (@arr) {
-               push @r,shift @arr;     # key
-               shift @arr;     # val
+       my %uri_args_headers_in_hash=(
+               "uri_args_frozen"=>$W->{"uri_args_frozen"},
+               "headers_in"=>{ headers_in_filtered(@$headers_in_keys_arrayref) },
+               );
+       return do { local $Storable::canonical=1; Storable::freeze(\%uri_args_headers_in_hash); };
+}
+
+sub cache_output_filter($)
+{
+my($f)=@_;
+
+       while ($f->read(my $text,0x400)) {
+               cluck "utf-8 untested" if Encode::is_utf8($text);       # Possible here at all?
+               $f->print($text);
+               $W->{"digest-md5"}->add($text);
                }
-       return @r;
+       return OK;
 }
 
-sub heading ()
+sub cache_start()
 {
-my($class)=@_;
+       # Used only if: !$W->{"http_safe"}
+       # but we would cause on different method(): Appending to the '_done' package list
+       # &Wrequire it here even if it will not be later used; to be stable!
+       Wrequire 'My::Hash::RestrictTo';
+       if (!$W->{"http_safe"}) {
+               __PACKAGE__->_no_cache();
+               return;
+               }
 
-       return if $W->{"heading_passed"}++;
+       {
+               my %uri_args_hash=(
+                       "method"=>$W->{"r"}->method(),
+                       "uri"=>"http://".$W->{"web_hostname"}."/".$W->{"r"}->uri(),
+                       "args"=>$W->{"args_orig"},
+                       );
+               $W->{"uri_args_frozen"}=do { local $Storable::canonical=1; Storable::freeze(\%uri_args_hash); };
+               last if !(my $headers_in_keys_arrayref=$uri_args_frozen_to_headers_in_keys{$W->{"uri_args_frozen"}});
+
+               # Protection to be sure we are stable:
+               $W->{"headers_in"}=My::Hash::RestrictTo->new($W->{"headers_in"},@$headers_in_keys_arrayref);
+
+               $W->{"uri_args_headers_in_frozen"}=uri_args_headers_in_frozen_get($headers_in_keys_arrayref);
+               last if !(my $headers_out_hashref=$uri_args_headers_in_frozen_to_headers_out{$W->{"uri_args_headers_in_frozen"}});
+               header(%$headers_out_hashref);
+               my $status;
+               {
+                       # &meets_conditions will always deny the attempt if !2xx status().
+                       # At least ap_read_request() sets: r->status=HTTP_REQUEST_TIME_OUT;     /* Until we get a request */
+                       my $status_old=$W->{"r"}->status();
+                       $W->{"r"}->status(HTTP_OK);
+                       # Update httpd's 'r->mtime' as the header "Last-Modified" is just not enough for ap_meets_conditions():
+                       # &update_mtime() argument is really in _secs_, not in _msecs_ as the docs claim.
+                       # Be aware '*1000000' would overflow Perl integer anyway.
+                       # &set_last_modified would also override the "Last-Modified" headers_out!
+                       # &mtime may exist but somehow does not work.
+                       $W->{"r"}->update_mtime(HTTP::Date::str2time($headers_out_hashref->{"Last-Modified"}));
+                       $status=$W->{"r"}->meets_conditions();
+                       $W->{"r"}->status($status_old);
+                       }
+               last if OK==$status;
+               $W->{"r"}->status($status);
+               $W->{"header_only"}=1;  # Inhibit &footer output.
+               exit;
+               die "NOTREACHED";
+               }
 
-       # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
-       my $client_charset=$W->{"force_charset"} || "us-ascii";
-       header("Content-Style-Type"=>"text/css");
-       header("Content-Script-Type"=>"text/javascript");
+       $W->{"digest-md5"}=Digest::MD5->new();
+       $W->{"cache_active"}=1;
+       $W->{"r"}->add_output_filter(\&cache_output_filter);
+}
 
-       while (my($key,$val)=each(%{$W->{"headers"}})) {
-               $W->{"r"}->header_out($key,$val);
+sub cache_finish_last_modified()
+{
+       cluck "Not yet done now? W __PACKAGE__: ".$W->{"__PACKAGE__"}
+                       if !$packages_used_hash{$W->{"__PACKAGE__"}}{"_done"};
+       for my $package_orig (@{$packages_used_array{$W->{"__PACKAGE__"}}}) {
+               local $_=$package_orig.".pm";
+               s{::}{/}g;
+               path_abs_disk "/$_","register"=>1;
+               }
+       my $mtime_newest;
+       for my $path_abs_disk (keys(%{$W->{"path_abs_disk_register"}})) {
+               my $mtime=(stat $path_abs_disk)[9];
+               do { cluck "No mtime for: $path_abs_disk"; next; } if !$mtime;
+               $mtime_newest=$mtime if !$mtime_newest || $mtime_newest<$mtime;
                }
-       $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
+       cluck "No mtime_newest found for the current W __PACKAGE__: ".$W->{"__PACKAGE__"}
+                       if !$mtime_newest;
+       return HTTP::Date::time2str($mtime_newest);
+}
+
+
+sub cache_finish()
+{
+       # Do not: return if !$W->{"uri_args_frozen"};
+       # as we may have just gave 304 and 'exit;' without starting the caching.
+       return if !$W->{"cache_active"};
+
+       # Headers may not be complete in this case; not sure, just trying.
+       return if $W->{"r"}->connection()->aborted();
+
+       # Fill-in/check: %uri_args_frozen_to_headers_in_keys
+       my $headers_in_keys_stored_arrayref_ref=\$uri_args_frozen_to_headers_in_keys{$W->{"uri_args_frozen"}};
+       my @headers_in_keys=tied(%{$W->{"headers_in_RecordKeys"}})->accessed();
+       if (!$$headers_in_keys_stored_arrayref_ref
+                       || !Data::Compare::Compare(\@headers_in_keys,$$headers_in_keys_stored_arrayref_ref)) {
+               cluck "Non-matching generated 'headers_in_keys' per 'uri_args_frozen' key:\n"
+                                               .Dumper(\@headers_in_keys,$$headers_in_keys_stored_arrayref_ref)
+                               if $$headers_in_keys_stored_arrayref_ref;
+               # Build or possibly prevent such further warn dupes:
+               $$headers_in_keys_stored_arrayref_ref=\@headers_in_keys;
+               # Build or regenerate as obsoleted now:
+               $W->{"uri_args_headers_in_frozen"}=uri_args_headers_in_frozen_get(\@headers_in_keys);
+               }
+
+       # Prepare 'headers_out' for the future reusal:
+       my %headers_out;
+       # Do not: $W->{"digest-md5"}->b64digest();
+       # as it will not provide the trailing filling '='s.
+       # RFC 1864 is not clear if they should be there but its sample provides them.
+       # Do not try to provide canonical "\r\n" form of newlines as is said by RFC 1864.
+       # RFC 2068 (HTTP/1.1) section 14.16 says the newlines should NOT be converted for HTTP.
+       # ',""' to avoid breaking the headers by its default "\n".
+       $headers_out{"Content-MD5"}=MIME::Base64::encode_base64($W->{"digest-md5"}->digest(),"");
+       # In fact we could also use MD5 for ETag as if we know ETag we also know MD5.
+       # But this way we do not need to calculate MD5 and we still can provide such ETag. So.
+       # $W->{"r"}->set_etag() ?
+       $headers_out{"ETag"}='"'.Digest::MD5::md5_base64($W->{"uri_args_headers_in_frozen"}).'"';
+       # $W->{"r"}->set_content_length() ?
+       $headers_out{"Content-Length"}=$W->{"r"}->bytes_sent();
+       my %Vary=map(($_=>1),(@headers_in_keys));
+       for (keys(%Vary)) {
+               next if !/^_/;
+               $Vary{"*"}=1;
+               delete $Vary{$_};
+               }
+       %Vary=("*"=>1) if $Vary{"*"};
+       $headers_out{"Vary"}=join(", ",sort keys(%Vary)) if keys(%Vary);
+       # $W->{"r"}->set_last_modified() ?
+       $headers_out{"Last-Modified"}=cache_finish_last_modified();
+
+       # Fill-in/check: %uri_args_headers_in_frozen_to_headers_out
+       my $headers_out_stored_hashref_ref=\$uri_args_headers_in_frozen_to_headers_out{$W->{"uri_args_headers_in_frozen"}};
+       if (!$$headers_out_stored_hashref_ref
+                       || !Data::Compare::Compare(\%headers_out,$$headers_out_stored_hashref_ref)) {
+               cluck "Non-matching generated 'headers_out' per 'uri_args_headers_in_frozen' key:\n"
+                                               .Dumper(\%headers_out,$$headers_out_stored_hashref_ref)
+                               if $$headers_out_stored_hashref_ref;
+               # Build or possibly prevent such further warn dupes:
+               $$headers_out_stored_hashref_ref=\%headers_out;
+               }
+
+###print STDERR Dumper(\%uri_args_frozen_to_headers_in_keys,\%uri_args_headers_in_frozen_to_headers_out);
+}
 
-       return if $W->{"heading_done"}++;
-       exit if $W->{"r"}->header_only();
+sub heading()
+{
+my($class)=@_;
 
-       if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
-               print '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
+       if (!$W->{"header_only"}) {
+               header("Content-Style-Type"=>"text/css");
+               # Do not: text/javascript
+               # as it does not look as registered, at least according to: MIME::Types $VERSION 1.15
+               # "application/javascript" so far standardized till 2005-12-08 by:
+               #       http://www.ietf.org/internet-drafts/draft-hoehrmann-script-types-03.txt
+               header("Content-Script-Type"=>"application/javascript");
+               # $W->{"r"}->content_languages() ?
+               do { header("Content-Language"=>$_) if $_; } for $W->{"language"};
+               }
+       # TODO: Support also: private
+       header("Cache-Control"=>"public");      # HTTP/1.1
+
+       # Use $W->{"charset"}=0 to disable charset.
+       $W->{"charset"}="us-ascii"
+                       if !defined $W->{"charset"} && (!defined($W->{"content_type"}) || $W->{"content_type"});
+
+       # Workaround bug
+       #   https://bugzilla.mozilla.org/show_bug.cgi?id=120556
+       # of at least
+       #   Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b) Gecko/20050217
+       # http://validator.w3.org/ does not send ANY "Accept" headers!
+       if (!defined $W->{"content_type"}) {
+               # Be _stable_ for "headers_in".
+               my $accept=$W->{"headers_in"}{"Accept"};
+               my $user_agent=$W->{"headers_in"}{"User-Agent"}||"";
+               $W->{"content_type"}="application/xhtml+xml"
+                               if !$accept && $user_agent=~m{^W3C_Validator/}i;
+               # Be _stable_:
+               my $negotiated=$class->Negotiate_choose([
+                               # Put the fallback variant as the first one.
+                               # Rate both variants the same to prefer "text/html" for undecided clients.
+                               # At least
+                               #   Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b) Gecko/20050217
+                               # prefers "application/xhtml+xml" over "text/html" itself:
+                               #   text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
+                               negotiate_variant(
+                                               "id"=>"text/html",
+                                               "content-type"=>"text/html",
+                                               "qs"=>0.6,
+                                               (!$W->{"charset"} ? () : "charset"=>$W->{"charset"}),
+                                               "lang"=>$W->{"language"},
+                                               ),
+                               negotiate_variant(
+                                               "id"=>"application/xhtml+xml",
+                                               "content-type"=>"application/xhtml+xml",
+                                               "qs"=>0.6,
+                                               (!$W->{"charset"} ? () : "charset"=>$W->{"charset"}),
+                                               "lang"=>$W->{"language"},
+                                               ),
+                               # application/xml ?
+                               # text/xml ?
+                               ]);
+               $W->{"content_type"}=$negotiated if !defined $W->{"content_type"};
                }
-       print '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
-       print '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
+       # mod_perl doc: If you set this header via the headers_out table directly, it
+       #               will be ignored by Apache. So do not do that.
+       my $type;
+       if ($W->{"content_type"}) {
+               $type=MIME::Types->new()->type($W->{"content_type"});
+               cluck "MIME::Types type '".$W->{"content_type"}."' not known" if !$type;
+               }
+       cluck "charset='".$W->{"charset"}."' does not match content-type='".$W->{"content_type"}."'"
+                       if ($W->{"charset"} ? 1 : 0) != (!$type ? 0 : $type->isAscii());
+       $W->{"r"}->content_type($W->{"content_type"}.(!$W->{"charset"} ? "" : "; charset=".$W->{"charset"}))
+                       if $W->{"content_type"};
+
+       cache_start();
+       # We still can append headers before we put out some text.
+       # FIXME: It is not clean to still append them without overwriting.
+       return if $W->{"heading_done"};
+       Wprint '<?xml version="1.0" encoding="'.$W->{"charset"}.'"?>'."\n"
+                       if (!$W->{"header_only"} || $W->{"header_only"} eq "xml") && (0
+                                       || $W->{"content_type"}=~m{^application/\w+[+]xml$}
+                                       || $W->{"content_type"} eq "text/vnd.wap.wml");
+       return if $W->{"header_only"};
+       # Split 'heading_done' for the proper handling of: /project/Rel.pm
+       $W->{"heading_done"}++;
+
+       Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
+       Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="'.$W->{"language"}.'">'."\n";
        my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
+       # Do not: cluck if $title=~/[<>]/;
+       # as it is not solved just by: &a_href_inhibit
+       # as sometimes titles use also: <i>...</i>
        $title=~s#<[^>]*>##g;
-       print "<head>";
-       print "<title>$title</title>\n";
-
+       Wprint "<head>";
+       Wprint "<title>$title</title>\n";
        if ($W->{"have_css"}) {
-               print <<'HERE';
-<style type="text/css"><!--
-.cvs-id   { font-family: monospace; }
-.error    { color: red;   background-color: transparent; }
-.quote    { font-family: monospace; }
-.nowrap   { white-space: nowrap; }
-.centered { text-align: center; }
-.tab-bold { font-weight: bold; }
-.tab-head { font-weight: bold; }
-/*
-.tab-head { font-weight: bold; color: yellow; background-color: transparent; }
-body {
-               background-color: black;
-               color: white;
-               }
-:link    { color: aqua;   background-color: transparent; }
-:visited { color: teal;   background-color: transparent; }
-h1,h2    { color: yellow; background-color: transparent; }
-*/
-td       { padding: 2px; }
-caption  { caption-side: bottom; }
-.footer img { vertical-align: middle; }
+               # Everything can get overriden later.
+               for my $css ("/My/Web.css",@{$W->{"css_push"}}) {
+                       Wprint <<"HERE";
+<link rel="stylesheet" type="text/css" href="@{[ uri_escaped(path_web $css) ]}" />
 HERE
-               print $W->{"head_css"}."\n";
-               print "--></style>\n";
+                       }
+               if ($W->{"css_inherit"}) {
+                       $W->{"js_push"}="/My/css_inherit.js";
+                       }
+               }
+       for my $js (@{$W->{"js_push"}}) {
+               # Do not: <script />
+               # as at least Lynx inhibits any further HTML output.
+               # Do not: text/javascript
+               # as it does not look as registered, at least according to: MIME::Types $VERSION 1.15
+               # "application/javascript" so far standardized till 2005-12-08 by:
+               #       http://www.ietf.org/internet-drafts/draft-hoehrmann-script-types-03.txt
+               Wprint <<"HERE";
+<script type="application/javascript" src="@{[ uri_escaped(path_web $js) ]}"></script>
+<script type="text/javascript"        src="@{[ uri_escaped(path_web $js) ]}"></script>
+HERE
+               }
+       Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
+       for my $head (@{$W->{"head_push"}}) {
+               $head=&{$head}() if "CODE" eq ref $head;
+               Wprint $head;
                }
-
-       print '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
-       print $W->{"head"};
        for my $type (qw(prev next index contents start up)) {
-               do { print '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
+               do { Wprint '<link rel="'.$type.'" href="'.uri_escaped(path_web $_).'" />'."\n" if $_; }
+                               for ($W->{"rel_$type"});
                }
-       print "</head><body";
-#      print ' bgcolor="black" text="white" link="aqua" vlink="teal"'
+       Wprint "</head><body";
+#      Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 #                      if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
-       print ">\n";
+       Wprint $W->{"body_attr"};
+       Wprint ">\n";
 
-       if ($W->{"heading"}) {
-               do { &{$_}() if $_; } for ($W->{"heading"});
-               }
+       do { Wprint $_ if $_; } for $W->{"heading"};
 }
 
+BEGIN {
+       delete $W->{"__My::Web_init"};
+       }
+
 1;