Browser DevTools Manual API Diagnosis Playbook

Debug browser API failures by opening the DevTools Network tab to capture and inspect failed requests, systematically checking for missing Bearer tokens, expired sessions, or CORS blocks. This isolates whether issues stem from client-side button flow or network reachability.

A 401 unauthorized error occurs when authentication headers are missing or sessions expire. Diagnose it by inspecting the network request in DevTools to validate Bearer token presence, then compare against a direct cURL request to isolate client-side logic from endpoint health.

Troubleshoot CORS blocks by capturing the failed cross-origin request in the browser DevTools Network tab to inspect response headers. Apply systematic checks to identify cross-origin blocking policies, comparing browser behavior against direct cURL endpoint verification.

Yes, use cURL to verify API endpoint health when browser requests time out. By executing direct cURL requests with the correct authentication headers, you isolate network reachability and endpoint availability from client-side button flow logic and CORS policies.

The best way to isolate client-side API failures is comparing browser-based request failures against direct cURL requests. This environment comparison technique separates endpoint health and network reachability from client-side authentication and CORS logic.