title: Data field not properly loading dict for Request
body: <p>I am trying to push this JSON into the data request, but I tink that the format is not passing in correctly. I keep getting a bad request. I know this request works when I put it in my REST client. 
  Am I not formating JSON correctly forthe post request?</p>
  
  <pre><code>import json
  import requests
  import pprint
  
  
  json_obj1 = """
    'dateStart': '2019-11-25T00:00:00.000Z',
    'dateEnd': '2019-11-26T23:59:59.999Z',
    'subscriptions': 
      {
        'category': {
          'name': 'Accessories',
          'childrenUuids': [],
          'uuid': 'c35cb71f-5dcd-4ae3-86b3-d642208ad7f5'
        },
        'geography': {
          'uuid': 'ad63a8ff-f636-44e1-9fe0-1d1664dfd530',
          'name': 'New York',
          'geoType': 'METRO',
          'childrenUuids': []
        }
      }
  
  """
  
  
  s = requests.session()
  
  
  s.headers = {'Content-Type': 'application/json'}
  infra_link = &lt;someURL&gt;
  infra_content = s.request(
      method='POST', url=infra_link, data=json_obj1, headers=s.headers,
  ).text
  </code></pre>
  
  <p>RESULT:</p>
  
  <p>{"timestamp":"2019-11-27T16:22:49.885+0000","status":400,"error":"Bad '
  'Request","exception":"org.springframework.http.converter.HttpMessageNotReadableException","message":"Bad '
   'Request","path":"/index"}')</p>