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Setting "inactive" time via HTTP header - 2 years ago

Nginx has “X-Accel-Expires” header field to set the caching time of a response in seconds. This allows caching rules to be partially controlled by the application that is generating the response. Similarly, is it possible to support a “X-Accel-Inactive” header field to control the removal of the cache entry without specifying "inactive=nnn" in proxy_cache_path? The objective is t