1 package Catalyst::View::ContentNegotiation::XHTML;
4 use MooseX::Types::Moose qw/Num Str ArrayRef/;
5 use MooseX::Types::Structured qw/Tuple/;
6 use HTTP::Negotiate qw/choose/;
8 use namespace::clean -except => 'meta';
10 # Remember to bump $VERSION in View::TT::XHTML also.
11 our $VERSION = '1.102';
17 isa => ArrayRef[Tuple[Str, Num, Str]],
19 builder => '_build_variants',
24 [qw| xhtml 1.000 application/xhtml+xml |],
25 [qw| html 0.900 text/html |],
29 after process => sub {
31 if ( my $accept = $self->pragmatic_accept($c) and $c->response->headers->{'content-type'} =~ m|text/html|) {
32 my $headers = $c->request->headers->clone;
33 $headers->header('Accept' => $accept);
34 if ( choose($self->variants, $headers) eq 'xhtml') {
35 $c->response->headers->{'content-type'} =~ s|text/html|application/xhtml+xml|;
38 $c->response->headers->push_header(Vary => 'Accept');
41 sub pragmatic_accept {
43 my $accept = $c->request->header('Accept') or return;
44 if ($accept =~ m|text/html|) {
45 $accept =~ s!\*/\*\s*([,]+|$)!*/*;q=0.5$1!;
48 $accept =~ s!\*/\*\s*([,]+|$)!text/html,*/*;q=0.5$1!;
59 Catalyst::View::ContentNegotiation::XHTML - Adjusts the response Content-Type
60 header to application/xhtml+xml if the browser accepts it.
64 package MyApp::View::TT;
67 use namespace::clean -except => 'meta';
69 extends qw/Catalyst::View::TT/;
70 with qw/Catalyst::View::ContentNegotiation::XHTML/;
76 This is a simple Role which sets the response C<Content-Type> to be
77 C<application/xhtml+xml> if the users browser sends an C<Accept> header
78 indicating that it is willing to process that MIME type.
80 Changing the C<Content-Type> to C<application/xhtml+xml> causes browsers to
81 interpret the page as XML, meaning that your markup must be well formed.
85 This is useful when you're developing your application, as you know that all
86 pages you view are parsed as XML, so any errors caused by your markup not
87 being well-formed will show up at once.
89 Whilst this module is has been tested against most popular browsers including
90 Internet Explorer, it may cause unexpected results on browsers which do not
91 properly support the C<application/xhtml+xml> MIME type.
93 =head1 METHOD MODIFIERS
97 Changes the response C<Content-Type> if appropriate (from the requests
102 =head2 pragmatic_accept
104 Some browsers (such as Internet Explorer) have a nasty way of sending Accept
105 */* and this claiming to support XHTML just as well as HTML. Saving to a file
106 on disk or opening with another application does count as accepting, but it
107 really should have a lower q value then text/html. This sub takes a pragmatic
108 approach and corrects this mistake by modifying the Accept header before
109 passing it to content negotiation.
115 Returns an array ref of 3 part arrays, comprising name, priority, output
116 mime-type, which is used for the content negotiation algorithm.
118 =head1 PRIVATE METHODS
120 =head2 _build_variants
122 Returns the default variant attribute contents.
128 =item L<Catalyst::View::TT::XHTML> - Trivial Catalyst TT view using this role.
130 =item L<http://www.w3.org/Protocols/rfc2616/rfc2616-sec12.html> - Content
137 Should be split into a base ContentNegotiation role which is consumed by
138 ContentNegotiation::XHTML.
144 =item Maintainer and contributor of various features - David Dorward (dorward) C<< <david@dorward.me.uk> >>
146 =item Original author and maintainer - Tomas Doran (t0m) C<< <bobtfish@bobtfish.net> >>
154 =item Florian Ragwitz (rafl) C<< <rafl@debian.org> >> - Conversion into a
155 Moose Role, which is what the module should have been originally.
161 This module itself is copyright (c) 2008 Tomas Doran and is licensed under the
162 same terms as Perl itself.