srcache_methods

The srcache_methods directive allows the user to define which HTTP request methods can be cached by the subrequest caching mechanism of the ngx_srcache module. By default, caching is generally restricted to safe methods such as GET and HEAD, but this directive offers flexibility to include other methods such as POST, PUT, and DELETE if the application requires it. This can be particularly useful in scenarios where the backend resources can remain unchanged after a POST request or where the response to a PUT or DELETE request might need to be cached for performance optimization.

The syntax for this directive accepts one or more HTTP method names as arguments, which are defined in a bitmask format. In practice, this means you can combine several methods within the directive, allowing you to fine-tune caching strategies according to your application's requirements. When configuring this directive, it is crucial to balance the need for cache efficiency with the risk of serving outdated content, especially for methods known to modify server state. So, implementations should also consider other directives and caching policies to control cache behavior comprehensively.

The location of the srcache_methods directive can be within the http, server, or location context, allowing developers to set this behavior at various scopes in the server configuration. This configuration flexibility enables tailored caching strategies across different parts of an application based on specific needs, such as API endpoints or static resource paths.