Hi Everyone,
I am making Serverless App with SMIs. I calling a third-party API using axios.post and setting the header to

headers: {

          Authorization: `Basic ${base64Encode}`,

          'Content-Type': 'application/x-www-form-urlencoded'

}

But when sending the request, axios is setting 'Content-type' to 'application/json'.
Here is my code for calling the third-party API in server.js:

let base64Encode = buffer.Buffer.from(data.iparams.client_id + ":" + data.iparams.client_secret).toString('base64');

let accTknBody = {

  grant_type: "urn:ietf:params:oauth:grant-type:jwt-bearer",

  assertion: String(data.iparams.jwtToken)

}

let response = await axios.post(data.iparams.server_url + '/restapi/oauth/token', accTknBody, {

  headers: {

    Authorization: `Basic ${base64Encode}`,

    'Content-Type': 'application/x-www-form-urlencoded'

  }

});

Note: All the variables have correct values.

Any help is appreciated.
Thanks