Update GET and DELETE requests to take body

[spruce-bruce]

The HTTP spec says that GET and DELETE requests don't have bodies, but sometimes you gotta.

Also, elastic search does a lot of GET body requests for large search requests (search is the most obvious use case for GET bodies).

Right now get takes a body object, but it just converts it to a query string and appends to the path. That functionality should either be removed or amended to add that to the body conditionally.

[chrisshiplet]

Technically the spec allows for GET requests to have bodies and even clarified in 2014 by removing their message-body SHOULD be ignored (https://stackoverflow.com/a/983458), fetch throws a TypeError when you attempt to do this, and the maintainers seem to disagree with that spec (whatwg/fetch#551) so I don't see this happening in the foreseeable future.

[mkotsollaris]

Is there any more clarification on this issue? The HTTP protocol explicitly mentions that GET requests can have a body; is that impossible by using fetch? 🤯

[spruce-bruce]

Fetch throws an error if you attach a body to the request. I haven't seen any new updates that make me think anything has changed