[Python] How can I POST JSON data with Python's Requests library?

I need to POST JSON content 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 hard-coded JSON content from the server (the code is not shown), but when I try to POST JSON content 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(data)
payload = {'json_payload': data_json}
r = requests.post("http://localhost:8080", data=payload)


Here is the server code.

class Root(object):

def __init__(self, content):
self.content = content
print self.content # This works

exposed = True

def GET(self):
cherrypy.response.headers['Content-Type'] = 'application/json'
return simplejson.dumps(self.content)

def POST(self):
self.content = simplejson.loads(cherrypy.request.body.read())


How can I fix this problem?

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