Clean up nginx rules for content caching (#4343)

creator-node/nginx_conf/nginx.conf

@@ -35,18 +35,13 @@ http {
         # Match the paths /ipfs/<cid: string> and /content/<cid: string>.
         # If present in cache, serve. Else, hit upstream server + update cache + serve.
         # http://nginx.org/en/docs/http/ngx_http_core_module.html#location
-        location ~ (/ipfs/|/content/|/file_lookup/) {
+        location ~ (/ipfs/|/content/) {
             proxy_cache cache;
             proxy_pass http://127.0.0.1:3000;
 
             # Set client IP as `X-Forwarded-For` response header
             proxy_set_header X-Forwarded-For $remote_addr;
 
-            # proxy_cache_use_stale + proxy_cache_background_update -> deliver stale content when client requests
-            # an item that is expired or in the process of being updated from origin server
-            proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
-            proxy_cache_background_update on;
-
             # Cache responses with certain status codes for some duration before considered stale.
             # Stale implies content will be fetched from the upstream server. Stale content WILL NOT
             # BE REMOVED from the cache.