Client Cache Time vs. Server Cache Time

Hi Guys,

I’d like to setup a reverse proxy that functions as follows.

Servers responds telling the client to cache content for 1 hour, but a
the same time tells Nginx to cache the content for 24 hours.

Every hour client still re-request content but it’s served from cache.

If something changes on the origin servers I can still dump the cache on
Nginx, which will get a fresh copy.

Is something like this currently supported?

Thanks
Warrick

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,228499,228499#msg-228499

Hello!

On Wed, Jul 11, 2012 at 09:15:53AM -0400, WarrickF wrote:

Nginx, which will get a fresh copy.

Is something like this currently supported?

Yes.

  1. Instruct nginx to ignore Cache-Control / Expires headers you
    use to control expiration on client.

  2. Either use explicit expiration set by proxy_cache_valid, or use
    X-Accel-Expires header to control expiration from backend.

See here for more details:

http://nginx.org/r/proxy_ignore_headers
http://nginx.org/r/proxy_cache_valid

Maxim D.