modify xhr response

index.js

const chromeLauncher = require('chrome-launcher');
const CDP = require('chrome-remote-interface');
const atob = require('atob');
const btoa = require('btoa');

async function main() {
    const chrome = await chromeLauncher.launch({
        chromeFlags: [
            '--window-size=1200,800',
            '--user-data-dir=/tmp/chrome-testing',
            '--auto-open-devtools-for-tabs'
        ]
    });
    const protocol = await CDP({port: chrome.port});
    const {Runtime, Network} = protocol;
    await Promise.all([Runtime.enable(), Network.enable()]);
    //Runtime.consoleAPICalled(({args, type}) => console[type].apply(console, args.map(a => a.value)));
    await Network.setRequestInterception({
        patterns: [{
            urlPattern: '*api*',
            resourceType: 'XHR',
            interceptionStage: 'HeadersReceived'
        }]
    });
    Network.requestIntercepted(async ({interceptionId, request}) => {
        console.log(`Intercepted ${request.url} {interception id: ${interceptionId}}`);
        const response = await Network.getResponseBodyForInterception({interceptionId});
        const bodyData = response.base64Encoded ? atob(response.body) : response.body;
        const newBody = '{}'//bodyData + `\nconsole.log('Executed modified resource for ${request.url}');`;
        const newHeaders = [
            'Date: ' + (new Date()).toUTCString(),
            'Connection: closed',
            'Content-Length: ' + newBody.length,
            'Content-Type: application/json'
        ];

        Network.continueInterceptedRequest({
            interceptionId,
            rawResponse: btoa('HTTP/1.1 500 Internal Server Error' + '\r\n' + newHeaders.join('\r\n') + '\r\n\r\n' + newBody)
        });
    });
}

main();