We have a web service where we'd like to deliver responses that vary depending on what time it is (local time) for the client. Conceptually, let's see we have REST endpoint to report what meal is coming up next (good for Hobbits):
GET http://.../nextMeal
Response: "Next meal is lunch!"
I want to be able to make the GET request without encoding the time is a query parameter, I would think this should be possible using a HTTP header. Googling around I see there are some old drafts proposing this but nothing official nor widely adopted.
Is there such a standard? If not, why not...?