AttributeError: 'Response' object has no attribute 'status_code'

[sentry]

Sentry Issue: FLAGSMITH-API-69B

InvalidHeader: Invalid HTTP Header: 'TRANSFER-ENCODING'
(1 additional frame(s) were not displayed)
...
  File "gunicorn/http/parser.py", line 41, in __next__
    self.mesg = self.mesg_class(self.cfg, self.unreader, self.source_addr, self.req_count)
  File "gunicorn/http/message.py", line 259, in __init__
    super().__init__(cfg, unreader, peer_addr)
  File "gunicorn/http/message.py", line 62, in __init__
    self.set_body_reader()
  File "gunicorn/http/message.py", line 461, in set_body_reader
    super().set_body_reader()
  File "gunicorn/http/message.py", line 186, in set_body_reader
    raise InvalidHeader("TRANSFER-ENCODING", req=self)

AttributeError: 'Response' object has no attribute 'status_code'
(3 additional frame(s) were not displayed)
...
  File "gunicorn/workers/sync.py", line 69, in run_for_one
    self.accept(listener)
  File "gunicorn/workers/sync.py", line 31, in accept
    self.handle(listener, client, addr)
  File "gunicorn/workers/sync.py", line 157, in handle
    self.handle_error(req, client, addr, e)
  File "gunicorn/workers/base.py", line 278, in handle_error
    self.log.access(resp, req, environ, request_time)
  File "common/gunicorn/logging.py", line 37, in access
    "response_status": resp.status_code,

Exception in worker process

Root cause

When gunicorn rejects a request during parsing, handle_error() builds the Response by hand and sets only resp.status. Our PrometheusGunicornLogger.access() reads resp.status_code, which then raises AttributeError.

Suggested fix

Read the status resiliently on the error path rather than assuming status_code exists — e.g. getattr(resp, "status_code", None), or derive it from resp.status (int(resp.status.split()[0]) when resp.status is a string), mirroring how gunicorn's own logger tolerates responses that never went through start_response().