srcache_store_ranges
The `srcache_store_ranges` directive controls whether range requests are cached using the transparent subrequest caching method.
Description
The srcache_store_ranges directive is used in NGINX configurations to specify whether or not to store responses for range requests in the cache when using the subrequest-based caching mechanism provided by the ngx_srcache module. When enabled (set to 'on'), NGINX caches the responses for range requests, which is particularly useful when clients request partial content of a resource, such as media files. This can lead to enhanced performance as the server can serve subsequent range requests directly from the cache, minimizing backend load and improving response times.
When srcache_store_ranges is set to 'off', the responses for range requests are not stored, which means that every range request is forwarded to the upstream server, regardless of whether a full version of the resource is available in cache. The setting is context-sensitive and can be declared in 'http', 'server', or 'location' blocks. The behavior is controlled by a simple flag, making it straightforward to modify caching behavior for range requests within specific contexts of your NGINX configuration.
Config Example
location /files {
srcache_store_ranges on;
srcache_store 200;
# other configurations ...
}Ensure that range requests are actually sent by the clients before testing the caching behavior of this directive, or else you may not see the effects in action.
Configuring multiple caching layers may lead to unexpected behavior; make sure to comprehend the interaction between those layers.
Caching media files effectively with this directive requires careful attention to response headers such as 'Content-Length'.