I need to POST a JSON from a client to a server. I'm using Python 2.7.1 and simplejson. The client is using Requests. The server is CherryPy. I can GET a hard-coded JSON from the server (code not shown), but when I try to POST a JSON to the server, I get "400 Bad Request". Here is my client code: data = {'sender': 'Alice', 'receiver': 'Bob', 'message': 'We did it!'} data_json = simplejson.dumps(da