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I've configured my system with NginX listening on port 80, serving static content and proxying dynamic requests to a backend server.
I can configure NginX to cache content generated by the backend, but I want this cached content be served only when the Backend responds with an error http 5xx, or when it's totally down.
We tried the proxy_cache_use_stale option with max-age of 1 second, it worked but it has one negative side.. which is simply dozens of requests being served from cache during this 1 second cache-aged-content. These requests served from cache will miss further Backend processing (Stats for example).
We can only afford to live with this negativity IF the backend was down,
Thus, the cache will act as a backup or a failover solution. But as long as the backend is up and responding, no requests should be served from cache.
I would appreciate any hints
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Go to the “Web Server” tab. In the “nginx settings” section, select the “Enable nginx caching” checkbox. (Optional) You can customize nginx caching settings. If you are not familiar with nginx caching, we recommend that you keep the default settings.
Cache both static and dynamic content from your proxied web and application servers, to speed delivery to clients and reduce the load on the servers.
Nginx caches the responses in the disk, proxy_cache_path specifies the path where the responses are to be stored. proxy_cache defines the shared memory zone used for storing the cache keys and other metadata. proxy_cache_key defines the caching key.
Take a look at proxy_cache_use_stale
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