proxy_cache only if custom header is set by upstream

[ThomasLohner]

Hi,

i know how to *prevent* caching if custom headers are set by upstream
with proxy_cache_bypass and proxy_no_cache.

This time i'd like to do the opposite, i want the response to be cached
*only* if a custom header is present.

I tried something like:

set $nocache 1;

proxy_no_cache $nocache;

...

if ($upstream_http_myheader = 1) {

  set $nocache 0;

}

But this doesn't work. Any ideas or am i missing something?

cheers

Thomas Lohner

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,226461,226461#msg-226461