How to use the apply function from superagent

server.js

GitHub: socketio/engine.io

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// hack to access the sockets created by node-xmlhttprequest
// see: https://github.com/driverdan/node-XMLHttpRequest/issues/44
const request = require("http").request;
const sockets = [];
http.request = function (opts) {
  const req = request.apply(null, arguments);
  req.on("socket", (socket) => {
    sockets.push(socket);
  });
  return req;

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