NAME
Catalyst::Plugin::DetachIfNotModified - Short-circuit requests with If-Modified-Since headers
VERSION
version v0.3.1
SYNOPSIS
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.DESCRIPTION
This plugin will allow your Catalyst app to handle requests with If-Modified-Since headers.
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.
METHODS
detach_if_not_modified_since
$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 304 (Not Modified) and detach.
The @timestamps is a list of unix epochs or objects with an epoch 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
$c->res->headers->remove_header('Last-Modified');CAVEATS
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 If a member is removed from that collection, then the maximum timestamp won't be affected, and the result is that an outdated web page may be cached by user agents.
SUPPORT FOR OLDER PERL VERSIONS
Since v0.3.0, the this module requires Perl v5.14 or later.
Future releases may only support Perl versions released in the last ten years.
If you need this module on earlier Perls, please use one of the v0.2.x versions of this module. Significant bug or security fixes may be backported to those versions.
SEE ALSO
Catalyst::Plugin::Cache::HTTP::Preempt
Plack::Middleware::ConditionalGET
SOURCE
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
BUGS
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.
AUTHOR
Robert Rothenberg <rrwo@cpan.org>
This module is based on code created for Science Photo Library https://www.sciencephoto.com.
COPYRIGHT AND LICENSE
This software is Copyright (c) 2020-2023 by Robert Rothenberg.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)