Getting a 406 Not Acceptable Error – What’s Causing It and How Do I Fix It? or Why Am I Seeing a 406

406 not acceptable error? Classic header mismatch.

Server’s like “I only speak JSON,” but your request is like “here’s HTML.”

Debug steps:
1. Use curl -v to see the full convo.
2. Check server logs for exact rejection reasons.
3. If you’re using a CDN, purge cache—could be stale headers.

Tool: https://reqbin.com/ to mock requests.