How to create PUT request object with this library ?

[suchibharani]

Below is the example code.
// obtain a JWT-enabled version of request
var request = require('google-oauth-jwt').requestWithJWT();
request({
url: 'https://www.googleapis.com/gmail/v1/users/xx.xx@goldenequator.com/settings/sendAs/xxx@xxx.com',
method : 'PUT',
json : true,
jwt: {
// use the email address of the service account, as seen in the API console
email: 'xxx-email-sign@xxx-email-signature.iam.gserviceaccount.com',
// use the PEM file we generated from the downloaded key
keyFile: 'xxx-email-sign.pem',
// specify the scopes you wish to access - each application has different scopes
scopes: ['https://mail.google.com/','https://www.googleapis.com/auth/gmail.modify',
'https://www.googleapis.com/auth/gmail.readonly','https://www.googleapis.com/auth/gmail.settings.basic',
'https://www.googleapis.com/auth/gmail.settings.sharing'],
delegationEmail: 'xxxx@xxx.com'
}
}, function (err, res, body) {
console.log(res);
});

I tried using "qs" to pass params but no luck.
Please help me on this.

Thanks