Plack::Middleware::Deflater(3pm)			User Contributed Perl Documentation			  Plack::Middleware::Deflater(3pm)

NAME

       Plack::Middleware::Deflater - Compress response body with Gzip or Deflate

SYNOPSIS

	 use Plack::Builder;

	 builder {
	   enable sub {
	       my $app = shift;
	       sub {
		   my $env = shift;
		   my $ua = $env->{HTTP_USER_AGENT} || '';
		   # Netscape has some problem
		   $env->{"psgix.compress-only-text/html"} = 1 if $ua =~ m!^Mozilla/4!;
		   # Netscape 4.06-4.08 have some more problems
		    $env->{"psgix.no-compress"} = 1 if $ua =~ m!^Mozilla/4.0[678]!;
		   # MSIE (7|8) masquerades as Netscape, but it is fine
		   if ( $ua =~ m!MSIE (?:7|8)! ) {
		       $env->{"psgix.no-compress"} = 0;
		       $env->{"psgix.compress-only-text/html"} = 0;
		   }
		   $app->($env);
	       }
	   };
	   enable "Deflater",
	       content_type => ['text/css','text/html','text/javascript','application/javascript'],
	       vary_user_agent => 1;
	   sub { [200,['Content-Type','text/html'],["OK"]] }
	 };

DESCRIPTION

       Plack::Middleware::Deflater is a middleware to encode your response body in gzip or deflate, based on "Accept-Encoding" HTTP request
       header. It would save the bandwidth a little bit but should increase the Plack server load, so ideally you should handle this on the
       frontend reverse proxy servers.

       This middleware removes "Content-Length" and streams encoded content, which means the server should support HTTP/1.1 chunked response or
       downgrade to HTTP/1.0 and closes the connection.

CONFIGURATIONS

       content_type
	     content_type => 'text/html',
	     content_type => [ 'text/html', 'text/css', 'text/javascript', 'application/javascript', 'application/x-javascript' ]

	   Content-Type header to apply deflater. if content-type is not defined, Deflater will try to deflate all contents.

       vary_user_agent
	     vary_user_agent => 1

	   Add "User-Agent" to Vary header.

ENVIRONMENT VALUE

       psgix.no-compress
	   Do not apply deflater

       psgix.compress-only-text/html
	   Apply deflater only if content_type is "text/html"

LICENSE

       This software is licensed under the same terms as Perl itself.

AUTHOR

       Tatsuhiko Miyagawa

SEE ALSO

       Plack, <http://httpd.apache.org/docs/2.2/en/mod/mod_deflate.html>

perl v5.14.2							    2012-06-18					  Plack::Middleware::Deflater(3pm)