mod_perl-2.0 compatible version.
authorshort <>
Sat, 30 Jul 2005 21:15:06 +0000 (21:15 +0000)
committershort <>
Sat, 30 Jul 2005 21:15:06 +0000 (21:15 +0000)
Web.pm

diff --git a/Web.pm b/Web.pm
index 524cf14..9268953 100644 (file)
--- a/Web.pm
+++ b/Web.pm
@@ -27,11 +27,13 @@ use Exporter;
 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 &a_href &a_href_cz &vskip &img &centerimg &rightimg $W &top_dir &top_dir_disk &Wprint &input_hidden_persistents);
+our @ISA=qw(Exporter Tie::Handle);
 
 BEGIN
 {
+       $W->{"__My::Web_init"}=1;
+
        sub Wrequire ($)
        {
        my($file)=@_;
@@ -42,9 +44,13 @@ 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.
+               my $who=$W->{"__PACKAGE__"};
+               $who||="__My::Web" if $W->{"__My::Web_init"};
+               if ($who) {
+                       my $aref=($W->{"packages_used"}{$who}||=[]);
+                       push @$aref,$class
+                                       if !{ map(($_=>1),@$aref) }->{$class};  # Prevent duplicated entries.
+                       }
                CORE::require $file;
                1;      # Otherwise 'require' would already file above.
        }
@@ -69,53 +75,56 @@ 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"};
+my $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);
+use URI;
+use URI::QueryParam;
 
 
 #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->{"packages_used"}{$W->{"__PACKAGE__"}}}
+               # @{$W->{"packages_used"}{"__My::Web"}}
                # %{$W->{"args"}}
 
 sub init ($%)
 {
 my($class,%args)=@_;
 
-       print STDERR "$class->init ".$ENV{"REQUEST_URI"}."\n";
+       print STDERR "$class->init ".Apache2::RequestUtil->request()->unparsed_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;
+       # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
+       # $Apache2::Registry::curstash is no longer supported.
+       do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
 
        $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 
        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");
+       do { $W->{$_}="" if !defined $W->{$_}; } for ("body_attr");
+       do { $W->{$_}="en-US" if !defined $W->{$_}; } for ("language");
 
        my $footer_any=0;
        for (qw(footer_mailme footer_ids)) {
@@ -125,35 +134,38 @@ my($class,%args)=@_;
        $W->{"footer"}=0 if !$footer_any;
        $W->{"footer_delimit"}=0 if !$W->{"footer"};
 
-       $W->{"r"}=Apache->request();
+       $W->{"r"}=Apache2::RequestUtil->request();
 
        $W->{"QUERY_STRING"}=$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]
-                                               ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
-                               .'" />'."\n";
+       if ($W->{"detect_ent"}) {
+                        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 (!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"};
+       # Workaround: &CGI::Vars behaves weird if strings passed both as POST data and in: $QUERY_STRING
+       do { $W->{"r"}->args(""); delete $ENV{"QUERY_STRING"}; } if $W->{"r"}->method() eq "POST";
        # 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/,$W->{"args"}{$_};
+       $W->{"args"}={ CGI->new($W->{"r"})->Vars() };
+       for my $name (keys(%{$W->{"args"}})) {
+               my @vals=split /\x00/,$W->{"args"}{$name};
                next if @vals<=1;
-               $W->{"args"}{$_}=[@vals];
+               $W->{"args"}{$name}=[@vals];
                }
 
-       do { $W->{$_}=$ENV{"HTTP_ACCEPT"} if !defined $W->{$_}; } for ("accept");
-       do { $W->{$_}=$ENV{"HTTP_USER_AGENT"} if !defined $W->{$_}; } for ("user_agent");
+       do { $W->{$_}=$W->{"r"}->headers_in()->{"Accept"}     if !defined $W->{$_}; } for ("accept");
+       do { $W->{$_}=$W->{"r"}->headers_in()->{"User-Agent"} if !defined $W->{$_}; } for ("user_agent");
 
        $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 
@@ -168,7 +180,34 @@ my($class,%args)=@_;
 
        do { args_check(%$_) if $_; } for ($W->{"args_check"});
 
-       return $W;
+       $ENV{"HOSTNAME"}||=&{$W->{"web_hostname_sub"}}();
+
+       return bless $W,$class;
+}
+
+sub Wprint($)
+{
+my($text)=@_;
+
+       $W->{"r"}->puts($text);
+}
+
+# local *FH;
+# tie *FH,ref($W),$W;
+sub TIEHANDLE($)
+{
+my($class,$W)=@_;
+
+       my $self={};
+       $self->{"W"}=$W or confess "Missing W";
+       return bless $self,$class;
+}
+
+sub WRITE
+{
+my($self,$scalar,$length,$offset)=@_;
+
+       Wprint substr($scalar,0,$length);
 }
 
 sub top_dir_disk ()
@@ -177,19 +216,20 @@ sub top_dir_disk ()
        return $INC[0]; # fallback
 }
 
-sub top_dir (;$)
+# $args{"abs"}
+sub top_dir (;$%)
 {
-my($in)=@_;
+my($in,%args)=@_;
 
-       if (my $uri=$ENV{"REQUEST_URI"}) {
-               if ($W->{"args"}{"Wabs"}) {
+       if (my $uri=$W->{"r"}->unparsed_uri()) {
+               if ($W->{"args"}{"Wabs"} || $args{"abs"}) {
                        # 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;
+                               $in=$uri."/".$in;
                                $in=~tr#/#/#s;
                                1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
                                }
@@ -231,7 +271,7 @@ my(%tmpl)=@_;
                $W->{"args"}{$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($val)."</span>"
@@ -253,10 +293,13 @@ sub fatal (;$)
 my($msg)=@_;
 
        $msg="UNKNOWN" if !$msg;
+       cluck "FATAL: $msg";
 
        $W->{"indexme"}=0;      # For the case no heading was sent yet.
+       $W->{"heading_done"}=0; # for the case of already sent {"header_only"}==1
+       $W->{"header_only"}=0;  # assurance for &heading
        My::Web->heading();
-       print "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
+       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();
@@ -266,31 +309,38 @@ sub footer (;$)
 {
        exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 
-       print vskip if $W->{"footer_delimit"};
+       Wprint vskip if $W->{"footer_delimit"};
 
-       if ($W->{"heading"}) {
-               do { &{$_}() if $_; } for ($W->{"footing_delimit"});
-               }
+       do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 
-       print "<hr />\n" if $W->{"footer"};
+       Wprint "<hr />\n" if $W->{"footer"};
 
        if ($W->{"footer_mailme"}) {
-               print '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
+               Wprint '<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";
+                       Wprint input_hidden_persistents()."\n";
+                       Wprint '<p align="right">'."\n";
+                               Wprint '<input name="msgscript" type="hidden" />'."\n";
+                               Wprint '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
+                               Wprint '<input name="submit" type="submit" value="Quick Note" />'."\n";
+                       Wprint '</p>'."\n";
+               Wprint '</form>'."\n";
                }
 
+       my @packages_used=(
+                       $W->{"__PACKAGE__"},
+                       __PACKAGE__,
+                       @{$W->{"packages_used"}{"__My::Web"}},
+                       map((!$_ ? () : @$_),$W->{"packages_used"}{$W->{"__PACKAGE__"}}),
+                       );
+       my %packages_used;
+       @packages_used=grep((!$packages_used{$_}++),@packages_used);
        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")
 #                                      || $package     # debug
                                        );
@@ -304,48 +354,38 @@ sub footer (;$)
                                        my $file=$package;
                                        $file=~s#::#/#g;
                                        my $ext;
+                                       my @tried;
                                        for (qw(.html.pl .pl .pm),"") {
                                                $ext=$_;
-                                               last if -r top_dir_disk()."/$file$ext";
-                                               cluck "Class file $file not found" if !$ext;
+                                               my $pathname=top_dir_disk()."/$file$ext";
+                                               push @tried,$pathname;
+                                               last if -r $pathname;
+                                               cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
                                                }
                                        $file.=$ext;
                                        $cvs_id_split[2]=""
                                                        .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?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]));
+                                       $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
+                                                       ($package!~/^Apache2::/ ? $package : $cvs_id_split[1]));
                                        $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($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}},
-                       ) {
+       for my $package (@packages_used) {
                my $cvs_id=(eval('$'.$package."::CVS_ID")
 #                              || $package     # debug
                                );
-               print '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
+               Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
                }
 
-       if ($W->{"heading"}) {
-               do { &{$_}() if $_; } for ($W->{"footing"});
-               }
+       do { &{$_}() if $_; } for ($W->{"footing"});
 
-       print "</body></html>\n";
+       Wprint "</body></html>\n";
        exit(0);
 }
 
@@ -384,6 +424,28 @@ my($url)=@_;
        return $url!~m#^[a-z]+://#;
 }
 
+sub url_out($%)
+{
+my($url,%args)=@_;
+
+       return $url if !url_is_local $url;
+       $url=top_dir($url,%args) if $url=~m#^/# || $args{"abs"};
+
+       my $uri=URI->new($url);
+       # Prefer the $uri values over "args_persistent" values.
+       $uri->query_form_hash({
+                       map({
+                               my $key=$_;
+                               my $val=$W->{"args"}{$key};
+                               (!defined $val ? () : ($key=>$val));
+                               } keys(%{$W->{"args_persistent"}})),
+                       %{$uri->query_form_hash()},
+                       });
+       $url="".$uri;
+
+       return $url;
+}
+
 sub a_href ($;$%)
 {
 my($url,$contents,%args)=@_;
@@ -397,7 +459,7 @@ my($url,$contents,%args)=@_;
        $contents=~s#<a\b[^>]*>##gi;
        $contents=~s#</a>##gi;
 
-       $url=top_dir($url) if url_is_local $url && $url=~m#^/#;
+       $url=url_out($url,%args);
 
        my $r='<a href="';
        my $urlent=CGI::escapeHTML($url);
@@ -425,20 +487,47 @@ my($url,$contents,%args)=@_;
        return $r;
 }
 
+sub input_hidden_persistents()
+{
+       return join("",map({
+               my $key=$_;
+               my $val=$W->{"args"}{$key};
+               (!defined $val ? () : '<input type="hidden"'
+                               .' name="'.CGI::escapeHTML($key).'"'
+                               .' value="'.CGI::escapeHTML($val).'"'
+                               .' />'."\n");
+               } (keys(%{$W->{"args_persistent"}}))));
+}
+
+sub http_moved($$;$)
+{
+my($self,$url,$status)=@_;
+
+       $url=url_out($url,"abs"=>1);
+       $status||=HTTP_MOVED_TEMPORARILY;
+       $W->{"r"}->status($status);
+       $W->{"r"}->headers_out()->{"Location"}=$url;
+       $W->{"header_only"}=1;
+       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();
+       my $r=$W->{"r"}->headers_in()->{"X-Forwarded-For"} || $W->{"r"}->get_remote_host();
        $r=~s/^.*,\s*//;
        return $r;
 }
 
 sub is_cz ()
 {
+       return 0 if !$have_Geo_IP;
        return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 }
 
@@ -473,9 +562,28 @@ my(%args)=@_;
        return [ map(($args{$_}),@fields) ];
 }
 
+# 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
+                       HTTP::Headers->new(%{$W->{"r"}->headers_in()}));
+       $best||=$variants->[0]{"id"};   # &HTTP::Negotiate::choose failed?
+       return $best;
+}
+
 my @img_variants=(
-               { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
-               { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
+               { "id"=>"png","qs"=>0.9,"content-type"=>"image/png" },
+               { "id"=>"gif","qs"=>0.7,"content-type"=>"image/gif" },
                );
 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 
@@ -516,10 +624,7 @@ my($file_base)=@_;
                                "size"=>(stat $file)[7],
                                );
                }
-       # Do not: ,$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?
+       my $ext=__PACKAGE__->Negotiate_choose(\@nego_variants);
 
        return $file_base_uri.".".$ext if !wantarray();
        return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
@@ -597,76 +702,97 @@ my(@arr)=@_;
        return @r;
 }
 
+sub no_cache($)
+{
+my($self)=@_;
+
+       header("Expires"=>"Mon, 26 Jul 1997 05:00:00 GMT");     # date in the past
+       header("Last-Modified"=>strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime()));        # always modified
+       header("Cache-Control"=>"no-cache, must-revalidate");   # HTTP/1.1
+       header("Pragma"=>"no-cache");   # HTTP/1.0
+}
+
 sub heading ()
 {
 my($class)=@_;
 
-       return if $W->{"heading_passed"}++;
-
        # $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");
+       do { header("Content-Language"=>$_) if $_; } for $W->{"language"};
+       $class->no_cache() if $W->{"no_cache"};
 
        while (my($key,$val)=each(%{$W->{"headers"}})) {
-               $W->{"r"}->header_out($key,$val);
+               $W->{"r"}->headers_out()->{$key}=$val;
                }
-       $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
-
-       return if $W->{"heading_done"}++;
        exit if $W->{"r"}->header_only();
+       return if $W->{"header_only"};
+       # 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"}++;
 
+       my $lang=($W->{"language"}||"en-US");
+       # 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
+       my $mime=$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,
+                                       "charset"=>$client_charset,
+                                       "lang"=>$lang,
+                                       ),
+                       negotiate_variant(
+                                       "id"=>"application/xhtml+xml",
+                                       "content-type"=>"application/xhtml+xml",
+                                       "qs"=>0.6,
+                                       "charset"=>$client_charset,
+                                       "lang"=>$lang,
+                                       ),
+                       # application/xml ?
+                       # text/xml ?
+                       ]);
+       $W->{"r"}->content_type("$mime; charset=$client_charset");
        if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
-               print '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
+               Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
                }
-       print '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
-       print '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
+       Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
+       Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="'.$lang.'">'."\n";
        my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
        $title=~s#<[^>]*>##g;
-       print "<head>";
-       print "<title>$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.
+               Wprint <<"HERE";
+<link rel="stylesheet" type="text/css" href="@{[ url_out("/My/Web.css") ]}" />
 HERE
-               print $W->{"head_css"}."\n";
-               print "--></style>\n";
                }
-
-       print '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
-       print $W->{"head"};
+       Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
+       Wprint $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="'.$_.'" />'."\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 { &{$_}() if $_; } for ($W->{"heading"});
 }
 
+BEGIN {
+       delete $W->{"__My::Web_init"};
+       }
+
 1;