I had best caching experience when I started using the openresty nginx bundle. It's a build of nginx that contains a bunch of Lua modules that make it a lean application server. With that I could create cache keys that exactly matched my (complex) business requirements

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> On Jun 27, 2017, at 5:43 PM, deivid__ <nginx-forum@forum.nginx.org> wrote:
>
> Hi.
>
> I'm trying to use 2 level proxying to cache files delivered with
> X-Accel-Redirect. This kinda works, the only thing missing is getting the
> cache_key to be the filename.
>
>
> If `proxy_cache` is unset (or set to the default), the caching mechanism
> "works":
> - Every request gets cached (good)
> - Different URLs that map to the same file get mapped to different cache
> keys (bad)
> - I get the header "X-Banana" with the correct file path (good)
>
> If `proxy_cache` is set to `$sent_http_x_test_header`:
> - Every request gets cached (good)
> - All URLs map to the same cache (very bad!)
> - I don't get the 'X-Banana' header at all
>
> This leads me to believe that in the second case, `$sent_http_x_test_header`
> is empty. But it's not in the first case? Why? What can I do?
>
> Full config below:
>
>
> proxy_cache_path /cache/nginx levels=1:2 keys_zone=cache:10m inactive=24h;
>
> upstream backend {
> server unix:///tmp/streaming-backend.sock;
> }
>
> server {
> listen 443 ssl;
> listen [::]:443 ssl;
> include /etc/nginx/ssl;
> index index.html;
> server_name pilotage.streamall.pw;
> gzip off;
>
> proxy_cache_min_uses 1;
> proxy_cache cache;
> proxy_cache_valid 200 24h;
>
> location /v/ {
> rewrite /v/(.+) /$1 break;
> proxy_pass http://127.0.0.1:9999/;
>
> proxy_request_buffering off; # needs 1.7.11
> proxy_ignore_headers X-Accel-Expires Expires Cache-Control
> Set-Cookie;
>
> # proxy_cache_key $sent_http_x_test_header;
> add_header X-Proxy-Cache $upstream_cache_status;
> add_header X-Banana $sent_http_x_test_header;
>
> }
>
> }
>
> server {
> listen 9999;
> location / {
> uwsgi_pass backend;
> include uwsgi_params;
>
> proxy_set_header X-Real-IP $remote_addr;
> proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
> }
>
> location /converted/ {
> internal;
> root /nfs/;
> add_header X-Test-Header $document_uri;
> }
> }
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,275178,275178#msg-275178
>
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