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package Plack::Middleware::ContentLength;
use strict;
use warnings;
use parent qw( Plack::Middleware );
use Plack::Util;
sub call {
my $self = shift;
my $res = $self->app->(@_);
return $self->response_cb($res, sub {
my $res = shift;
my $h = Plack::Util::headers($res->[1]);
if (!Plack::Util::status_with_no_entity_body($res->[0]) &&
!$h->exists('Content-Length') &&
!$h->exists('Transfer-Encoding') &&
defined(my $content_length = Plack::Util::content_length($res->[2]))) {
$h->push('Content-Length' => $content_length);
}
});
}
1;
__END__
=head1 NAME
Plack::Middleware::ContentLength - Adds Content-Length header automatically
=head1 SYNOPSIS
# in app.psgi
builder {
enable "Plack::Middleware::ContentLength";
$app;
}
# Or in Plack::Handler::*
$app = Plack::Middleware::ContentLength->wrap($app);
=head1 DESCRIPTION
Plack::Middleware::ContentLength is a middleware that automatically
adds C<Content-Length> header when it's appropriate i.e. the response
has a content body with calculable size (array of chunks or a real
filehandle).
This middleware can also be used as a library from PSGI server
implementations to automatically set C<Content-Length> rather than in
the end user level.
=head1 AUTHOR
Tatsuhiko Miyagawa
=head1 SEE ALSO
Rack::ContentLength
=cut
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