HTTP 415 — Unsupported Media Type
4xx Client Error
What it means
The server does not accept the Content-Type the client sent.
What to do about it
The usual cause is a JSON body sent without Content-Type: application/json, or a form posted as JSON to an endpoint expecting multipart/form-data.
Where it sits
415 belongs to the 4xx family: The request contains something the server will not or cannot process. The fix is normally on the client side.
HTTP/1.1 415 Unsupported Media TypeChecking it yourself
# see the status code and headers only
curl -sI https://example.com/path
# follow redirects and print each hop
curl -sIL -o /dev/null -w "%{http_code} %{url_effective}\n" https://example.com/path
# JavaScript
const r = await fetch(url);
console.log(r.status, r.statusText);