Do GraphQL call from ServiceNow

// var instance = 'dev12345';
// var username = 'admin';
// var password = 'yourpassword';

var graphql = JSON.stringify({
  query: "query {\r\n  countries {\r\n    name\r\n  }\r\n}",
  variables: {}
})


// Instantiate request with ServiceNow API incidents table endpoint
var request = new GlideHTTPRequest('https://countries.trevorblades.com/');
// Add authentication data
//request.setBasicAuth(username, password);

// Add the Accept header to get JSON response
request.addHeader('Accept', 'application/json');

// Execute the GET request
var response = request.post(graphql);

// Print the results: status code and number of records returned
gs.print(response.getStatusCode());
gs.print('Countries Response: ' + response.getBody());