const {PassThrough} = require('stream');
    protocol.registerStreamProtocol('app', ((request, callback) => {
      let url = new murl.URL(request.url);
      let newUrlOptions = {
        auth: url.auth,
        hash: url.hash,
        host: webpackDevServerUrl.host,
        hostname: url.hostname,
        href: url.href,
        path: url.path,
        pathname: url.pathname,
        protocol: webpackDevServerUrl.protocol,
        search: url.search,
        slashes: url.slashes,
        port: webpackDevServerUrl.port,
        query: url.query,
      };
      let newUrl = murl.format(newUrlOptions);
      const netRequest = net.request({
        method: 'GET',
        url: newUrl
      });

      netRequest.on('response', response => {
        console.log("netRequest response");
        const rv = new PassThrough();
        callback({
          statusCode: response.statusCode,
          headers: response.headers,
          data: rv
        });
        response.on('data', chunk => {
          rv.push(chunk);
        });
        response.on('end', () => {
          rv.push(null);
        });
      });

      netRequest.on('abort', () => {
        console.log("netRequest abort");
        callback({
          statusCode: 501
        })
      });

      netRequest.on('error', (error) => {
        console.log("netRequest error", error);
        callback({
          statusCode: error.code
        })
      });

      netRequest.end();
    }));