ignore part of URL to force caching?

António P. P. Almeida appa at perusio.net
Fri Oct 5 10:20:00 UTC 2012

On 5 Out 2012 12h09 CEST, igor at sysoev.ru wrote:

> On Fri, Oct 05, 2012 at 11:49:12AM +0200, António P. P. Almeida
> wrote:
>> On 4 Out 2012 20h20 CEST, aweber at comcast.net wrote:
>>> I would like to "override" the intent of the app server that is
>>> basically disabling any caching of the backend file.  For example,
>>> they are embedding a "noCache=#######" parameter at the end of the
>>> URL (there are other parameters following, but if I can check the
>>> url up-to the "?"  that would suit me fine).
>>> This is actually a dynamically generated SWF file, but the file is
>>> then constant for a reasonable amount of time such that I'd like
>>> to cache it for a few minutes.
>>> Is there a way in a specific "location" to tell nginx to ignore
>>> the parameters (or any portion of the URL) when determining the
>>> cached object for that URL?  In other words, tell nginx to cache
>>> content for that location, say only 5min, and ignore all
>>> parameters when determining whether to cache and how to match
>>> cached content?
>> If I understand correctly. Inside your main cached location you can
>> do:
>> if ($request_uri ~* noCache) {
>> return 418;
>> }
>> error_page 418 =200 @other-cached-location;
>> And add @other-cached-location:
>> location @other-cached-location {
>> # Set your cache parameters here and serve the content.
>> }
> There is proxy_cache_key for this.

I was under the impression that there wasn't a specific location for
the swf files. If there is in fact the proxy already has all you need
for doing it much easier.

--- appa

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