Am 29.05.2015 um 11:13 schrieb Mark Thomas:
On 15/05/2015 19:46, Rémy Maucherat wrote:
2015-05-13 22:57 GMT+02:00 Mark Thomas <ma...@apache.org>:
<snip/>
The next steps are to get a basic implementation working which means:
- figure out how to feed requests into Tomcat's processing chain
- figure out how to extract the response back into the HTTP/2
implementation.
Is it really a good idea to use the same API for HTTP/2 servlets ? I
haven't seen anything going on in the expert group.
The little discussion there has been has been around using a
RequestDispatcher to trigger server push. There is a strong implication
there that the existing API will be extended rather than a new one
added. Based on the general Java EE views on backwards compatibility I'm
expecting HTTP/2 to have to work (at some level) with existing Servlets.
What the extended API will look like for HTTP/2 is TBD at this point.
I have now plumbed in basic request/response processing.
Just a remark on what I have taken from some discussion elsewhere on
server push: the original idea for server push in HTTP/2 was being able
to send related content immediately without waiting for the client to
request it, e.g. JS, CSS, images accompanying a page and similar stuff.
The HTTP/2 server mechanism has no defined way to check, whether a
client would actually request it or already has it in some cache or
whether his request would have been served by a cache in between. It is
all up to servers to create heuristics about when they think server push
makes sense or not.
Even if there were an API for a webapp to request server push, the
webapp would face the same heuristics problem.
There might be other easier to solve use cases for HTTP/2 server push,
but that was the one I saw discussion about. It is definitely not the
kind of push we see in other APIs or protocols. The HTTP/2 push is
always triggered by a client request.
Hoping what I wrote makes sense ...
Rainer
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