API Request Errors: Causes and Fixes

Quickly map timeout/network/4xx/5xx to concrete fixes.

Fast diagnosis map

• Timeout: increase timeout or check upstream latency.
• Network: verify URL, DNS and HTTPS certificate.
• 4xx: check auth token, request body, required fields.
• 5xx: retry and verify server health logs.

Step-by-step recovery

1. Replay the same request and capture full response headers.
2. Isolate request variables (auth, query, body) one by one.
3. Confirm whether failure is regional or global in your infrastructure.
4. Document fix and save a clean request template for your team.