code: def log_request(resp):
      
      l = "[{4}] {0} {1} {2} <{3}>".format(request.remote_addr, request.method,
                                           request.url, request.endpoint,
                                           resp.status_code)
      c = str(resp.status_code)[0]
      if c in ['1', '2'] or resp.status_code == 304:
          app.http_logger.info(l)
      elif c == '3':
          app.http_logger.warn(l)
      else:
          app.http_logger.error(l)
      return resp
docs: Log a request.