memc_flags_to_last_modified
The `memc_flags_to_last_modified` directive sets the Memcached flags to the Last-Modified timestamp of the cached response.
Description
The memc_flags_to_last_modified directive modifies how flags are set in responses coming from Memcached. When this directive is enabled and the cached response is served, it converts the existing Memcached flags into an HTTP Last-Modified timestamp format. This allows users to manage cache expiration and validation based on the content's modification time, providing better control over caching behavior and enabling efficient cache invalidation strategies.
The directive can take a flag parameter, which should be specified based on how the flags are utilized in your caching strategy. Specifying this flag will dictate how Memcached interprets and sets these timestamps. Specifically, this behavior comes into play when handling cache hits; instead of using fixed or default flags, the response will reflect the actual last modification time, allowing for more dynamic and context-aware caching scenarios.
For instance, when creating an application that heavily relies on the freshness of data, using this directive can improve user experience by ensuring that users are receiving the most up-to-date content as soon as it changes. It is particularly useful in scenarios involving frequent updates of the cached content, as clients can then manage cache state effectively using the provided Last-Modified header.
Config Example
location /foo {
set $memc_key $arg_key;
memc_pass 127.0.0.1:11211;
memc_flags_to_last_modified some_flag;
}Ensure the flags parameter is correctly set; incorrect flags can lead to unexpected behavior.
Using this directive without a proper caching strategy may result in stale data being served if not managed carefully.