HTTP GET request with parameters in body and Content-Type header

[khiav223577]

We're trying to replace our custom json-parser middleware in our project with grape formatter middleware recently,
and found that if we send a GET request with parameters in body and with application/json Content-Type, parameters will disappear.

It looks like grape doesn't accept this kind of request

grape/lib/grape/middleware/formatter.rb

Lines 78 to 81 in f5d9831

	def read_body_input
	return unless
	(request.post? || request.put? || request.patch? || request.delete?) &&
	(!request.form_data? || !request.media_type) &&

I'm not sure if setting Content-Type HTTP header in GET request is a good practice or not.
Could grape support this just like it do for DELETE in #448? Or add this kind of support into config, so that we can do our own configuration?

[dblock]

Do the RFCs say that you can/cannot have a body on a GET with a content-type? I imagine we'd want to stick to whatever that says.

I don't see a problem parsing a body on a GET, but this is a pretty major breaking change, so it would need to be done carefully, major version upgrade & al. Something configurable (list of methods allowing a body?) may be a good way to start.