NAME Plack::Middleware::ETag - Adds automatically an ETag header. SYNOPSIS use Plack::Builder; my $app = builder { enable "Plack::Middleware::ETag", file_etag => [qw/inode mtime size/]; sub {['200', ['Content-Type' => 'text/html'}, ['hello world']]}; }; DESCRIPTION Plack::Middleware::ETag adds automatically an ETag header. You may want to use it with "Plack::Middleware::ConditionalGET". my $app = builder { enable "Plack::Middleware::ConditionalGET"; enable "Plack::Middleware::ETag", file_etag => "inode"; sub {['200', ['Content-Type' => 'text/html'}, ['hello world']]}; }; CONFIGURATION file_etag If the content is a file handle, the ETag will be set using the inode, modified time and the file size. You can select which attributes of the file will be used to set the ETag: enable "Plack::Middleware::ETag", file_etag => [qw/size/]; cache_control It's possible to add 'Cache-Control' header. enable "Plack::Middleware::ETag", cache_control => 1; Will add "Cache-Control: must-revalidate" to the headers. enable "Plack::Middleware::ETag", cache_control => [ 'must-revalidate', 'max-age=3600' ]; Will add "Cache-Control: must-revalidate, max-age=3600" to the headers. AUTHOR franck cuny SEE ALSO LICENSE This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.