VoxEngineHttpRequest.js

const sessionId = () => Math.floor(100000 * Math.random());
Net.httpRequest("https://api.dialogflow.com/v1/query?v=20170712&contexts=weather&query=" 
                + encodeURI(userSpeech) 
                + "&lang=en&sessionId=" 
                + sessionId() 
                + "&timezone=Europe/Moscow", (e) => {
       // here we receive the JSON and continue our scenario execution
    }, 
    { headers: ["Authorization: bearer 1799227ce77f446fa8d64749f70527ca"]});