Azure : Web API - The requested resource does not support http method 'GET'

I was running a web API on Azure and doing a POST.

The full error is:

{
    "Message": "The requested resource does not support http method 'GET'."
}

That's weird because the method is decorated with  [HttpPost] and I was doing a POST.

Then I noticed that I was calling Azure with a http connection.

Changing to https fixed the issue.

Enjoy!