HTTP 415 Unsupported Media Type

The body is in a format the endpoint does not accept — usually a Content-Type mismatch.

Why you would test it

Frequently caused by the client, not the server: a forgotten Content-Type header, or a form encoding where JSON was expected.

Endpoints that return 415

1 endpoint in this playground answers with 415. Every one is free, needs no signup, and can be called from the browser or with curl.

Other client error codes

All HTTP status codes · All 37 mock REST APIs · Getting started guide