Function testForHeaders

packages/engine.io/test/server.js:3506–3520

(headers, callback)

  describe("response headers", () => {
    function testForHeaders(headers, callback) {
      const engine = listen((port) => {
        engine.on("connection", (conn) => {
          conn.transport.once("headers", (headers) => {
            callback(headers);
            conn.close();
          });
          conn.send("hi");
        });
        new ClientSocket(`ws://localhost:${port}`, {
          extraHeaders: headers,
          transports: ["polling"],
        });
      });
    }

    it("should contain X-XSS-Protection: 0 for IE8", (done) => {
      const headers = {