Plack::Middleware::ETag - Adds automatically an ETag header. [![Build Status](https://travis-ci.org/franckcuny/plack-middleware-etag.svg?branch=travis-ci)](https://travis-ci.org/franckcuny/plack-middleware-etag) ## SYNOPSIS ```perl 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". ```perl 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: ```perl enable "Plack::Middleware::ETag", file_etag => [qw/size/]; ``` ### cache_control It's possible to add 'Cache-Control' header. ```perl enable "Plack::Middleware::ETag", cache_control => 1; ``` Will add "Cache-Control: must-revalidate" to the headers. ```perl enable "Plack::Middleware::ETag", cache_control => [ 'must-revalidate', 'max-age=3600' ]; ``` Will add "Cache-Control: must-revalidate, max-age=3600" to the headers. ```perl check_last_modified_header ``` Will not add an ETag if there is already a Last-Modified header. ## AUTHOR Franck Cuny ## LICENSE This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.