Modification to ImportJSON

ImportJSONBasicAuth.js

function ImportJSONBasicAuthentication(url, query, parseOptions, username, password) {

  var fetchOptions = {
    "headers" : {
       "Authorization" : 'Basic ' + Utilities.base64Encode(username + ':' + password)
    },
    muteHttpExceptions: true
  };

   return ImportJSONAdvanced(url, fetchOptions, query, parseOptions, includeXPath_, defaultTransform_);
}