HTTP 2 will support server push, what does this mean?

Question

I\'ve read a lot of things about HTTP 2 (which is still in development), so I also heard about the server push feature, but I my head, this is not clear.

Does this s

Answer 1

Essentially your understanding is correct, however, there is a lot more to it.

The server will only be able to send a resource to the client after a request for an HTTP page has been made and the resources required by that page for it to render properly, i.e. images, JavaScript files, CSS etc, have been identified. The mechanism responsible for this is the server side framework. In Java, this will be Servlet 4 and possibly JSF.

A server can not just send any resource to the client when it feels like it. Only under the above circumstance will it occur and a client will always be able to reject the server request to push a resource.

The mechanism of HTTP/2 server push has been really well designed and to get to grips with it I recommend this overview of HTTP/2 and this in depth article diving into the internals of the HTTP/2 protocol.