Testing OAuth token refresh logic in production. Endpoint /api/v2/oauth/tokens. Token expires every 60 seconds. Refresh endpoint returns 401 Unauthorized occasionally. Using Python SDK version 3.5. Environment US-EAST-1. Grant type client_credentials. Scope contacts.read. No rate limit headers visible in response. Stack trace attached.
POST /api/v2/oauth/tokens
Content-Type: application/x-www-form-urlencoded
grant_type=client_credentials&scope=contacts.read
Response 200 OK.
Next call to /api/v2/contacts returns 401 after 59 seconds.
Token refresh logic requires exponential backoff during transient network errors. For business continuity, implement a fallback cache for tokens when primary endpoint fails. Verify clock skew between client and cloud environment.
Sync NTP servers to prevent premature expiration failures. Async token handling ensures stable DR flows.
Postman caching headers causing stale auth tokens. Clear chrome cookie storage for the domain before testing API calls. Check developer console network tab for 401 errors on refresh tokens.
Extension like REST Client might inject extra headers blocking requests. Incognito mode often bypasses these conflicts during troubleshooting sessions.