honors spec content-type for POST requests when no body. see https:/…

[kwv]

#1022

[shockey]

The code looks good to me, but based on the discussion in #1022, it's not clear to me if this a use case we're going to support (sending content-type for empty POSTs).

@webron, would appreciate your input here 😄

[marjan-georgiev]

This feature is the only thing preventing us from using this library in our application. It would be great if it got merged in.

[shockey]

@webron, bump

[webron]

I'm not convinced this is the right solution, and will be closing the PR without merging. Merging this PR will cause, in some cases, completely invalid requests. If you take the application/json example, you're telling the API producer that you're sending it an application/json- making it try to parse an empty string as a JSON which is just not a valid JSON. I'd be happy to reconsider if someone shows concrete information as to why it should be allowed, but until then...