Most API endpoints return either an
ETag or a
Last-Modified header. You are encouraged to use conditional requests and cache resources and lists of resources on your client.
Making a conditional request and receiving a 304 response does not count against your Rate Limit, so we encourage you to use it whenever possible.
Last-Modified header applies to response messages only. The value of this response header indicates the last time a specific resource or a group of resources was last changed. It may then be used to retrieve values from the server only if something changed on the server in the meantime.
Similar mechanism can be used with the