Catalyst - Customizing the view to stop IE from caching JSON

John Wang — Tue, 25 Jul 2006 10:49:00 -0500

Often times you'll want to customize your response specific to the View being used, e.g. setting extra headers. This can be done directly in your View class by creating a process method. All View base classes have a process method defined in Catalyst::View that gets called at rendering time. By adding a process method in your subclass and redispatching to the parent you can do some preliminary processing.

One use is preventing IE from caching JSON responses by setting the Cache-Control and Pragma HTTP response headers. You can do this in the application's JSON view as follows:

package MyApp::View::JSON;
use strict; use warnings;
use base qw/Catalyst::View::JSON/;

sub process {
  my $self = shift;
  my $c = $_[0];
  $c->res->header( 'Cache-Control' =>
    'no-store, no-cache, must-revalidate,'.
    'post-check=0, pre-check=0, max-age=0'
  );
  $c->res->header( 'Pragma' => 'no-cache' );
  $c->res->header( 'Expires' => 'Thu, 01 Jan 1970 00:00:00 GMT' );
  $self->NEXT::process(@_);
}

1;

Your process method will get called, set it's response headers and then use NEXT to call C::V::JSON's process method.

Dev411 Blog: Catalyst - Customizing the view to stop IE from caching JSON

Catalyst - Customizing the view to stop IE from caching JSON