Error in request, cache key

[a21250450]

Error:
Traceback (most recent call last):
  File "/root/DNSaaS.py", line 497, in requestToken
    response, content = h.request(target.geturl(), 'POST', json.dumps(msgJson), headers)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 2135, in request
    cachekey,
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1796, in _request
    conn, request_uri, method, body, headers
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1737, in _conn_request
    response = conn.getresponse()
  File "/usr/lib/python2.7/httplib.py", line 1108, in getresponse
    raise ResponseNotReady()
ResponseNotReady

    def requestToken(self, user, password, tenant):
        """
        Method responsible ask for a token.

        :param user: User name
        :param password: Password
        :param tenant: Tenant name
        :rtype : object
        """
        headers = {
            'Accept': 'application/json',
            'Content-Type': 'application'
        }
        target = urlparse(self.__apiurlAAA)

        h = http.Http()
        msgJson = {"auth": {"tenantName": tenant, "passwordCredentials": {"username": user, "password": password}}}
        try:
            response, content = h.request(target.geturl(), 'POST', json.dumps(msgJson), headers)
        except:
            traceback.print_ex()
            return -1, "Server API not reachable,chega aqui "
        response_status = response.get("status")
        return response_status, content

Hello, someone can help me with these errors, I'm trying to make the orders with the postman?

Thanks