Getting a 415 Error - What's Causing It and How Do I Fix It? or Why Am I Seeing a 415 Error and How C

415 error often means the server’s like "I dunno what this is." Even if your headers seem right, the payload might be off.

Try sending a minimal JSON payload, like `{}`, to rule out data issues.

Also, some frameworks (looking at you, Spring) need explicit configs to accept JSON.