HTTP Status Code 415 indicates Unsupported Media Type. This status is returned when the server refuses to accept the request because the payload format is in a format that is not supported by the server for the requested resource. For instance, if a client attempts to upload a file with a media type that the server cannot process, such as sending a JSON payload to an endpoint that only accepts XML, the server will respond with this status code. Clients should check the Content-Type of their request to ensure it matches what the server expects for that endpoint.