Add support for "X-HTTP-Method-Override" header. #4
Description
Some HTTP clients only have the ability to send GET and POST requests. And some HTTP servers can only accept GET and POST requests. So, for those situations, there is a convention people have used with a specific header (X-HTTP-Method-Override).
There are at least 3 different headers that I have seen from different sources. But, as long as we support one, that should allow people to build an accessible REST API.
It might make sense to only let the header override the verb for POST requests. (There is very little reason to override a DELETE request with a header to tell it to be a GET.)