Why Is Error "unsupported media Type" Reported When I Subimt a SQL Job?

In the REST API provided by DLI, the request header can be added to the request URI, for example, Content-Type.

Content-Type indicates the request body type or format. The default value is application/json.

URI for submitting a SQL job: POST /v1.0/{project_id}/jobs/submit-job

Content-Type can be only application/json. If Content-Type is set to text, "unsupported media Type" is displayed.