docs: def submit(recaptcha_challenge_field,
             recaptcha_response_field,
             private_key,
             remoteip,
             use_ssl=False):
      """
      Submits a reCAPTCHA request for verification. Returns RecaptchaResponse
      for the request
  
      recaptcha_challenge_field -- The value of recaptcha_challenge_field
      from the form
      recaptcha_response_field -- The value of recaptcha_response_field
      from the form
      private_key -- your reCAPTCHA private key
      remoteip -- the user's ip address
      """
  
      if not (recaptcha_response_field and recaptcha_challenge_field and
              len(recaptcha_response_field) and len(recaptcha_challenge_field)):
          return RecaptchaResponse(
              is_valid=False,
              error_code='incorrect-captcha-sol'
          )
  
      if getattr(settings, "NOCAPTCHA", False):
          params = urlencode({
              'secret': want_bytes(private_key), 
              'response': want_bytes(recaptcha_response_field), 
              'remoteip': want_bytes(remoteip),
          })
      else:
          params = urlencode({
          'privatekey': want_bytes(private_key),
          'remoteip':  want_bytes(remoteip),
          'challenge':  want_bytes(recaptcha_challenge_field),
          'response':  want_bytes(recaptcha_response_field),
          })
  
      if not PY2:
          params = params.encode('utf-8')
  
      if use_ssl:
          verify_url = 'https://%s/recaptcha/api/verify' % VERIFY_SERVER
      else:
          verify_url = 'http://%s/recaptcha/api/verify' % VERIFY_SERVER
  
      if getattr(settings, "NOCAPTCHA", False):
          verify_url = 'https://%s/recaptcha/api/siteverify' % VERIFY_SERVER
  
      req = Request(
          url=verify_url,
          data=params,
          headers={
              'Content-type': 'application/x-www-form-urlencoded',
              'User-agent': 'reCAPTCHA Python'
          }
      )
  
      httpresp = urlopen(req)
      if getattr(settings, "NOCAPTCHA", False):
          data = json.loads(httpresp.read().decode('utf-8'))
          return_code = data['success']
          return_values = [return_code, None]
          if return_code:
              return_code = 'true'
          else:
              return_code = 'false'
      else:
          return_values = httpresp.read().splitlines()
          return_code = return_values[0]
  
      httpresp.close()
  
      if (return_code == "true"):
          return RecaptchaResponse(is_valid=True)
      else:
          return RecaptchaResponse(is_valid=False, error_code=return_values[1])