# unsupported_media_type

**HTTP 415 — Unsupported media type**

## When you see it

The request has no `Content-Type: application/json`.

## What to do

Set the header. The API speaks JSON only; there is no form or multipart endpoint in v1.

## The response

Every error is [RFC 9457](https://www.rfc-editor.org/rfc/rfc9457) problem+json:

```json
{
  "type": "https://devs.inittasks.com/errors/unsupported_media_type",
  "title": "Unsupported media type",
  "status": 415,
  "detail": "a sentence for a developer; never branch on it",
  "instance": "/todos/8E4F2A1B",
  "request_id": "3f9a1c7e-2b44-4d1e-9c30-5a7e8b2d1f60"
}
```

// Branch on `type`, never on `detail` or on the HTTP status alone — several codes share a status.