fix(gateway): FabriX 가 맞는 인증 조합에도 간헐 401 — 4개 조합 뒤 유력 조합 1초 쉬고 한 번 더

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

5_django_backend/tests/test_gateway.py

@@ -126,6 +126,26 @@ async def test_401_retries_other_auth_shape_and_remembers(upstream):
     assert len(calls) == n + 1 and calls[-1].headers["x-openapi-token"] == "Bearer tok"
 
 
+@override_settings(FABRIX_ENV=FULL_ENV)
+async def test_flaky_401_on_right_auth_is_retried_once(upstream, monkeypatch):
+    """FabriX 가 맞는 조합에도 가끔 401 — 4개 다 돈 뒤 맨 앞 조합 한 번 더."""
+    from apps.gateway import views
+
+    monkeypatch.setattr(views, "RETRY_PAUSE_S", 0)
+    hits = {"n": 0}
+
+    def handler(req: httpx.Request) -> httpx.Response:
+        hits["n"] += 1
+        if hits["n"] <= 4:
+            return httpx.Response(401, content=b"flaky")
+        return httpx.Response(200, json={"choices": []})
+
+    calls = upstream(handler)
+    resp = await _post({"messages": []})
+    assert resp.status_code == 200 and len(calls) == 5
+    assert calls[0].headers.get("x-openapi-token") == calls[4].headers.get("x-openapi-token")
+
+
 @override_settings(FABRIX_ENV=FULL_ENV)
 async def test_stream_upstream_error_becomes_sse_error(upstream):
     upstream(lambda r: _sse(b"boom", 500))