HTTP methods

monerod endpoints supports multiple HTTP methods that do not necessarily make sense.

For example:

curl \
	http://127.0.0.1:18081/get_limit \
	-H 'Content-Type: application/json' \
	--request DELETE

This is sending an HTTP DELETE request, which should be a GET.

monerod will respond to this the same as GET, POST, PUT, and TRACE.

Cuprate's behavior

TODO: decide allowed HTTP methods for Cuprate https://github.com/Cuprate/cuprate/pull/233#discussion_r1700934928.