How do you send "commands" to a RESTful server?
Use case: My server caches certain information so that it does not have to read the database every time that information is requested. I need a way to send a command from my client application to tell the server to flush the cache. Would you use POST or PUT on some URL like ".../flush_cache"?
The "command" is not really data that needs "Representational State Transfer", unless the state being transferred is the result of the command -- "switch is off", "cache is flushed", etc. As a general rule, how does REST send commands to the server?