How to Use KnoxProxy with Zapier

// Zapier Code by Zapier - Run JavaScript
// Input Data: proxy_url, target_url

const proxyUrl = inputData.proxy_url;
const targetUrl = inputData.target_url;

// Parse proxy URL
const url = new URL(proxyUrl);
const proxyHost = url.hostname;
const proxyPort = url.port;
const proxyAuth = Buffer.from(
  `${url.username}:${url.password}`
).toString('base64');

const http = require('http');
const https = require('https');

const response = await new Promise((resolve, reject) => {
  const proxyReq = http.request({
    host: proxyHost,
    port: proxyPort,
    method: 'CONNECT',
    path: new URL(targetUrl).host + ':443',
    headers: {
      'Proxy-Authorization': `Basic ${proxyAuth}`,
    },
  });

  proxyReq.on('connect', (res, socket) => {
    const req = https.request(
      targetUrl,
      { socket, agent: false },
      (res) => {
        let data = '';
        res.on('data', (chunk) => (data += chunk));
        res.on('end', () => resolve(data));
      }
    );
    req.end();
  });

  proxyReq.on('error', reject);
  proxyReq.end();
});

output = { body: response };