code: def require_representation(self, req):
          
          try:
              type_, subtype, _ = parse_mime_type(req.content_type)
              content_type = '/'.join((type_, subtype))
          except:
              raise falcon.HTTPUnsupportedMediaType(
                  description="Invalid Content-Type header: {}".format(
                      req.content_type
                  )
              )
  
          if content_type == 'application/json':
              body = req.stream.read()
              return json.loads(body.decode('utf-8'))
          else:
              raise falcon.HTTPUnsupportedMediaType(
                  description="only JSON supported, got: {}".format(content_type)
              )
docs: Require raw representation dictionary from falcon request object.
  
          This does not perform any field parsing or validation but only uses
          allowed content-encoding handler to decode content body.
  
          Note:
              Currently only JSON is allowed as content type.
  
          Args:
              req (falcon.Request): request object
  
          Returns:
              dict: raw dictionary of representation supplied in request body