Sending POST data with GET request valid?

Question

Using Curl for example, I can \"post\" data in a GET request. Is this a valid thing to do? With that I mean:

• Is it not forbidden by any RFC specification?

Answer 1

There is a "good reason" use case out there.

elasticsearch uses entity-body data in GET requests to try to use the GET verb as a read while also allowing a more complicated specification than url alone allows (easily).