# Proxy\_cache - how to change expires? **URL:** \ **Category:** NGINX\ **Created:** [May 13, 2010, 9:52am UTC](https://www.ruby-forum.com/t/proxy-cache-how-to-change-expires/188522 "2010-05-13T09:52:35Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![CSSSSdric\_Jeanneret](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@CSSSSdric\_Jeanneret](https://www.ruby-forum.com/u/CSSSSdric_Jeanneret)\ **Post date:** [May 13, 2010, 9:52am UTC](https://www.ruby-forum.com/t/proxy-cache-how-to-change-expires/188522/1 "2010-05-13T09:52:35Z")
Hello! I’m using nginx as a proxy-cache for OSM tiles. My problem is this sentence in documentation : “”“The cache honors backend’s Cache-Control, Expires, and etc since version 0.7.48"”"[1] I saw that we’re supposed to be able to override some headers, like “expires” with proxy\_ignore\_headers[2], but it doesn’t seem to work. OSM has an expires set to 3 hours. I’d like to keep tiles for 5 days, so I have: proxy\_ignore\_client\_abort on; proxy\_ignore\_headers “Expires” “X-Accel-Expires”; proxy\_cache\_valid 200 302 7d; proxy\_cache\_valid 404 1m; But it seems my cache is really reseted each 3 hours (for now there isn’t many traffic on this vhost, it’s just a proof of concept for a client). Did I miss something in the documentation ? if so, what ? Maybe I don’t use the right configuration, too. Any hints ? Thank you ! Best regards, C. [1] [Module ngx\_http\_proxy\_module](http://wiki.nginx.org/NginxHttpProxyModule#proxy_cache) [2] [Module ngx\_http\_proxy\_module](http://wiki.nginx.org/NginxHttpProxyModule#proxy_ignore_headers) ---
**Author:** ![CSSSSdric\_Jeanneret](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@CSSSSdric\_Jeanneret](https://www.ruby-forum.com/u/CSSSSdric_Jeanneret)\ **Post date:** [May 13, 2010, 12:21pm UTC](https://www.ruby-forum.com/t/proxy-cache-how-to-change-expires/188522/2 "2010-05-13T12:21:49Z")
Hello! On Thu, May 13, 2010 at 09:51:37AM +0200, Cédric Jeanneret wrote: > proxy\_ignore\_headers “Expires” “X-Accel-Expires”; > proxy\_cache\_valid 200 302 7d; > proxy\_cache\_valid 404 1m; > > But it seems my cache is really reseted each 3 hours (for now there > isn’t many traffic on this vhost, it’s just a proof of concept for a > client). > > Did I miss something in the documentation ? if so, what ? > Maybe I don’t use the right configuration, too. Any hints ? Expires may be set via Cache-Control as well (max-age=). You have to ignore it too. Maxim D. ---
**Author:** ![CSSSSdric\_Jeanneret](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@CSSSSdric\_Jeanneret](https://www.ruby-forum.com/u/CSSSSdric_Jeanneret)\ **Post date:** [May 13, 2010, 12:25pm UTC](https://www.ruby-forum.com/t/proxy-cache-how-to-change-expires/188522/3 "2010-05-13T12:25:20Z")
On Thu, May 13, 2010 at 09:51:37AM +0200, Cédric Jeanneret wrote: > OSM has an expires set to 3 hours. I’d like to keep tiles for 5 days, so I have: > Maybe I don’t use the right configuration, too. Any hints ? > nginx sets an expiration time at the moment when a response is cached. > If you did not ignore the headers some time ago, previously cached > responses will be valid for 3 hours only. New responses should be > cached for 7 days. – Igor S. > **[Igor Sysoev](http://sysoev.ru/en/)** ---
**Author:** ![CSSSSdric\_Jeanneret](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@CSSSSdric\_Jeanneret](https://www.ruby-forum.com/u/CSSSSdric_Jeanneret)\ **Post date:** [May 13, 2010, 7:13pm UTC](https://www.ruby-forum.com/t/proxy-cache-how-to-change-expires/188522/4 "2010-05-13T19:13:25Z")
On Thu, May 13, 2010 at 12:24 PM, Igor S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > “expires” with proxy\_ignore\_headers[2], but it doesn’t seem to work. > > Igor S. > [Igor Sysoev](http://sysoev.ru/en/) > > * * * > > nginx mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://nginx.org/mailman/listinfo/nginx) Oh, thank you for the Cache-Control hint. I just added it, I’ll see what happens from now. Thank you for the quick answer. See you! C.