# Cach override headers

**URL:** <https://www.ruby-forum.com/t/cach-override-headers/211247>\
**Category:** NGINX\
**Created:** [August 30, 2011, 7:22pm UTC](https://www.ruby-forum.com/t/cach-override-headers/211247 "2011-08-30T19:22:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [August 30, 2011, 7:22pm UTC](https://www.ruby-forum.com/t/cach-override-headers/211247/1 "2011-08-30T19:22:38Z")

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Hi  
Could anyone supply a concise list of the headers that an upstream  
server may return which will override my cache age/time values as set in  
nginx.conf  
I believe there are quite a few but would like a definitive list

Many thanks