uwsgi_cache_key

The uwsgi_cache_key directive is utilized to define a custom key that NGINX will use to store responses in the uWSGI cache. This directive can be essential in scenarios where the cache needs to be segmented based on certain parameters such as session IDs, user authentication states, or any other variable that impacts the content served for a given request. By default, NGINX would use a hash of the request URI, but with this directive, you can explicitly specify how the cache key should be constructed.

The directive works by allowing a single argument, which is a string that can include variables, constants, or both, thereby offering a flexible way to build the caching key. For instance, you might want to include the variable $http_cookie if you want different cache entries based on user sessions. The key defined here is critical for ensuring that cache entries are hit accurately, ensuring the expected responses are retrieved when the same request is made subsequently.