Catalyst::Plugin::DetachIfNotModified - Short-circuit requests with If-Modified-Since headers
In your Catalyst class:
use Catalyst qw/ DetachIfNotModified /;
In a controller method:
my $item = ... $c->detach_if_not_modified_since( $item->timestamp ); # Do some CPU-intensive stuff or generate response body here.
This plugin will allow your Catalyst app to handle requests with
If the content of a web page has not been modified since a given date, you can quickly bail out and avoid generating a web page that you do not need to.
This can improve the performance of your website.
This should be used with Plack::Middleware::ConditionalGET.
$c->detach_if_not_modified_since( @timestamps );
This sets the
Last-Modified header in the response to the
maximum timestamp, and checks if the request contains a
If-Modified-Since header that not less than the maximum timestamp. If it
does, then it will set the response status code to
Modified) and detach.
@timestamps is a list of unix epochs or objects with an
method, such as a DateTime object.
This should only be used with GET or HEAD requests.
If you later need to reset the
Last-Modified header after calling
this method, you can use
Be careful when aggregating a collection of objects into a single timestamp, e.g. the maximum timestamp from a list. If a member is removed from that collection, then the maximum timestamp won't be affected, and the result is that an outdated web page may be cached by user agents.
The development version is on github at https://github.com/robrwo/Catalyst-Plugin-DetachIfNotModified and may be cloned from git://github.com/robrwo/Catalyst-Plugin-DetachIfNotModified.git
Please report any bugs or feature requests on the bugtracker website https://github.com/robrwo/Catalyst-Plugin-DetachIfNotModified/issues
When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.
Robert Rothenberg email@example.com
This module is based on code created for Science Photo Library https://www.sciencephoto.com.
COPYRIGHT AND LICENSE
This software is Copyright (c) 2020 by Robert Rothenberg.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)