# NAME Plack::Middleware::Expires - mod\_expires for plack # SYNOPSIS use Plack::Builder; builder { enable 'Expires', content_type => qr!^image/!i, expires => 'access plus 3 months'; $app; } # DESCRIPTION Plack::Middleware::Expires is Apache's mod\_expires for Plack. This middleware controls the setting of Expires HTTP header and the max-age directive of the Cache-Control HTTP header in server responses. Note: Expires works only for successful response and If exists Expires HTTP header already, this middleware does not override. # CONFIGURATIONS - content\_type content_type => qr!^image!, content_type => 'text/css', content_type => [ 'text/css', 'application/javascript', qr!^image/! ] Content-Type header to apply Expires - Expires Same format as the Apache mod\_expires expires => 'M3600' # last_modified + 1 hour expires => 'A86400' # access + 1 day expires => 'modification plus 3 years 3 month 3 day' expires => 'access plus 3 days' # AUTHOR Masahiro Nagano # SEE ALSO [http://httpd.apache.org/docs/2.2/en/mod/mod\_expires.html](http://httpd.apache.org/docs/2.2/en/mod/mod\_expires.html) # LICENSE This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.