This is essentially a cache-control type header sonos polls continuously to know when to invalidate its cache. response.favorites is calculated by pulling all favorite cloudcast ids, concatenating and md5 'ing them response.catalog updates every SONOS_CATALOG_EXPIRATION minutes Return Streaming end point for a cloudcast Sonos calls this function to report when an account has been added to the Sonos system for the device. Return an empty response to avoid erroring. addToContainer adds a new cloudcast (id) to a playlist (parentId) The Crux of the menu system, this starts on an id "root" and allow you to navigate a type of tree system including content and lists Sonos calls this function to report play status changes. We do not need this information, so we re just returning an empty response to avoid erroring. Returns all Metadata for a specific cloudcast reorderContainer reorders cloudcasts within a playlist Used by Sonos to report on radio stream failures. Return an empty response to avoid erroring. renameContainer sets a new name to a playlist removeFromContainer removes a cloudcast from a playlist createContainer creates a new playlist. Figure out who the user is from the session_id Sonos calls this endpoint every "interval" (we set that below; 300) seconds. Its like a ping request to keep track of listener minutes. NOTE: We are interntionally ignoring this function call for now deleteContainer deletes a playlist by id. id comes in as 'playlist-id' so we have to parse it first