hg: jdk/jdk: 8238270: java.net HTTP/2 client does not decrease stream count when receives 204 response

[daniel.fuchs at oracle.com]

Changeset: fd72cd98180e
Author:    dfuchs
Date:      2020-04-20 13:15 +0100
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/fd72cd98180e

8238270: java.net HTTP/2 client does not decrease stream count when receives 204 response
Summary: The HTTP/2 Stream is updated to register a trivial data subscriber in case of 204 so that the END_STREAM is correctly processed.
Reviewed-by: chegar

! src/java.net.http/share/classes/jdk/internal/net/http/ExchangeImpl.java
! src/java.net.http/share/classes/jdk/internal/net/http/Stream.java
+ test/jdk/java/net/httpclient/Response204V2Test.java
! test/jdk/java/net/httpclient/http2/server/Http2TestExchangeImpl.java