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Re: Nginx http proxy caching

May 10, 2010 03:24PM
On Mon, May 10, 2010 at 03:02:09PM -0400, Jim Ursetto wrote:

> Vinay Y S Wrote:
> -------------------------------------------------------
> > Hi,
> > Is there developer documentation on how http
> > caching works in nginx? I'm
> > seeing weird caching behavior where it's caching
> > responses with Cache-Control: private headers.
>
> nginx completely ignores the `private` keyword and
> will cache your document regardless.
>
> > As I've asked in another thread, I'm also trying
> > to understand how I can
> > enable/disable caching per request based on a
> > cookie or a header set by
> > upstream server.
>
> You can send `Cache-control: max-age=0` or
> `Cache-control: no-cache` to disable nginx proxy cache.
>
> Note that because `private` is ignored, you cannot tell
> nginx to not use the proxy cache while still allowing
> the browser to cache (for example,
> `Cache-control: max-age=3600, private`). You can only
> disable the proxy cache in the configuration file based
> on the current Location. I don't really understand this
> behavior; I think private should be honored.

You are right, "private" should be ignored.
However, you may say nginx "X-Accel-Expires: 0" to not cache such
responses. You may say different cache times for nginx and
browsers/transit proxies:

X-Accel-Expires: 500
Cache-Control: max-age=100


--
Igor Sysoev
http://sysoev.ru/en/

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Subject Author Posted

Nginx http proxy caching

Vinay Y S January 19, 2010 01:00AM

Re: Nginx http proxy caching

Jim Ursetto May 10, 2010 03:02PM

Re: Nginx http proxy caching

Igor Sysoev May 10, 2010 03:24PM

Re: Nginx http proxy caching

Jim Ursetto May 10, 2010 03:43PM

Re: Nginx http proxy caching

Jim Ursetto May 10, 2010 03:46PM

Re: Nginx http proxy caching

Ryan Malayter May 10, 2010 05:58PM

Re: Nginx http proxy caching

Maxim Dounin May 10, 2010 09:10PM

Re: Nginx http proxy caching

Ryan Malayter May 14, 2010 09:16AM

Re: Nginx http proxy caching

Ryan Malayter May 14, 2010 10:34AM



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