PAYARA-2890 HTTP/2 Server Push Issues #15
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First commit is the main fix. Stream was handling RST_STREAM response to push promise before transitioning stream state from sending the push promise, causing Http2SessionException. Fixed this by swapping the order of the operations.
Second commit addresses spurious NPE sourced at
org.glassfish.grizzly.http2.Http2SessionOutputSink$OutputQueueRecord.access$100(Http2SessionOutputSink.java:318). After splitting the class out I can't reproduce the error. Regardless of fix, this is a good OCD change anyway.