> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.usglobalmail.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.usglobalmail.com/_mcp/server.

# Unsupported media type

Returned as `application/problem+json` with `code` `unsupported_media_type` and HTTP status `415`.

The request `Content-Type` is not supported.

## Common causes

* A request with a body was sent without `Content-Type: application/json`, or with a different media type.

## How to resolve

* Set `Content-Type: application/json` on any request that has a body.

## Example

```json
{
  "type": "https://docs.usglobalmail.com/api/problems/unsupported_media_type",
  "title": "The request media type is not supported.",
  "status": 415,
  "code": "unsupported_media_type",
  "request_id": "req_8f3c2a1b9d",
  "instance": "/v1/mails"
}
```

> **Note**
>
> Retrying without changing the request will not help — fix the request first.