code: async def read(self) -> bytes:
          
          if self._body is None:
              try:
                  self._body = await self.content.read()
                  for trace in self._traces:
                      await trace.send_response_chunk_received(self._body)
              except BaseException:
                  self.close()
                  raise
          elif self._released:
              raise ClientConnectionError('Connection closed')
  
          return self._body
docs: Read response payload.