With browsers, this wasn't really possible because you needed to give the full response after a single request. But running locally you can test all you want.

With browsers, this wasn't really possible because you needed to give the full response after a single request. But running locally you can test all you want. The problem is when you can't get everybody to agree on a standard API, so you resort to hacks that make it work ASAP that then lead to more and more hacks till we get the insane user agents of today.