Hi,

I looked inside the codes to find out the strategy of PUSH and got some
problems.

When fetching a resource the client has 3 possibilities:

   - the resource is not being pushed
   - the resource is being pushed, but the data has not yet arrived
   - the resource is being pushed, and the data has started to arrive

What is the strategy used when facing case 2 "the resource is being pushed,
but the data has not yet arrived"?

Jetty sends request as follows:

session.syn(new SynInfo(headers, true), new StreamFrameListener.Adapter()...

So IMO there will be some check up in "syn()" to determine if the
resource is being pushed, but I did not find related logic, so what is the
mechanism in JETTY to solve case 2 in order to avoid sending redundant
"GET"?
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