proxy_headers_hash_max_size

Описание

The `proxy_headers_hash_max_size` directive is used in the NGINX HTTP server to set the maximum size of the hash table that stores the keys of HTTP headers when using the `proxy_set_header` directive. This is particularly relevant when NGINX operates as a reverse proxy, as it facilitates the mapping of the incoming headers to the corresponding backend server headers. The parameter for this directive is a number that determines how many hash entries can be created. In scenarios where a large number of different headers may be set or modified, increasing this value can help prevent hash table collisions and improve performance. It's essential to strike a balance—setting this value too high can lead to increased memory consumption, while a value set too low may lead to hashing conflicts, resulting in potential issues in header retrieval. The directive can be used in the `http`, `server`, and `location` contexts, allowing for flexible configuration at different levels of the NGINX hierarchy. When properly configured, it enhances the ability of NGINX to manage proxy headers efficiently, especially under high-load conditions with numerous distinct header types.

Пример конфига

proxy_headers_hash_max_size 1024;