[Bug] oauth2: cannot fetch token: 415 Unsupported Media Type Response

[rv-qjohnston]

Describe the bug

Unable to generate an auth0 token using clientId and secret. Receive error that oauth2: cannot fetch token: 415 Unsupported Media Type Response.

Steps to reproduce

Create a data source with the below configuration:

• Auth Type: Oauth2
• Grant Type: Client Credentials
• Auth Style: In Params
• Client ID: **
• Client Secret: **
• Token URL: https://api.example.com/api/v1/auth/api-token
• Allowed hosts: https://api.example.com

When performing a query, receive this error:

oauth2: cannot fetch token: 415 Unsupported Media Type Response: {"type":"https://tools.ietf.org/html/rfc9110#section-15.5.16","title":"Unsupported Media Type","status":415,"traceId":"00-6faa912765b51b3bc33d48412c697167-95571988308e9835-00"}

Version Details:

• Grafana version : 10.4
• Plugin version : 2.9.1

Additional context

The below curl using api documentation works successfully to generate a token:

Request: curl --request POST \ --url https://api.example.com/api/v1/auth/api-token \ --header 'accept: application/json' \ --header 'content-type: application/json' \ --data '{ "clientId": "string", "secret": "string" }'

Response: { "token": *", "refresh_token": "***", "expires_in": 86400 }