Can't get a simple proxy to cache anything
nginx_list at chezphil.org
Sun Jan 24 12:56:35 UTC 2021
Maxim Dounin wrote:
> You haven't configured any proxy_cache_valid directives (see
> http://nginx.org/r/proxy_cache_valid for details), and the
> response doesn't have any cache validity headers, such as
> "Expires" or "Cache-Control: max-age=...".
Thanks Maxim! It now seems to work.
I guess I was expecting the proxy_cache_path inactive=... time
to determine how long things were cached for. I think I have a
better understanding now. Let me check if I have this right:
The upstream server doesn't specify any Cache-Control or Expires
headers. It does supply an ETag and Last-Modified. I'd like to
cache these files for a long time (say 18 months), but revalidate
using the ETag (say after 5 minutes). So I have:
proxy_cache_path ... inactive=18M;
proxy_cache_valid 200 5m; # Beware M = Month, m = minute.
Is that right?
I have some other questions:
1. What proxy_cache_key should I be using? I am unsure of the difference
between e.g. host and proxy_host, and uri and request_uri. I currently
Do I need "$is_args$args" ?
2. Is there any way to indicate the cache status in the access log? I.e.
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