first of all good idea

[Frank Lemanschik]

Your Idea is good but it is not as new.

There is a big concept that your missing. In Backends we use Something Called Caching. So there will be never a long running request that don't gets Streamed we Cache the Resulting HTML in its final State.

but still nice idea but i can't find a case where this is faster then Other Methods.

[Matthew Phillips]

Not everything is cacheable.