title: Keep-alive option in webpack-dev-server with http-proxy-middleware?
body: <p>We are using webpack-dev-server with http-proxy-middleware.  Our Protractor test cases keep timing out.  I suspect we need to have keep-alive set to true, but I don't see such an option either in webpack-dev-server nor in http-proxy-middleware.  Is it possible to configure keep-alive for wepack-dev-server?</p>
  
  <p>Thanks</p>