Only if your server code process each request in a separate thread. But that's also true, when using web-sockets or when using the GIF approach. When implementi

Only if your server code process each request in a separate thread. But that's also true, when using web-sockets or when using the GIF approach. When implementing real-time applications, you always have to write non-blocking asynchronous server code, for example using node.js or Twisted.