hg: jdk/jdk12: 8218662: Allow 204 responses with Content-Length:0

[chris.hegarty at oracle.com]

Changeset: 4ce47bc1fb92
Author:    chegar
Date:      2019-02-08 12:23 +0000
URL:       http://hg.openjdk.java.net/jdk/jdk12/rev/4ce47bc1fb92

8218662: Allow 204 responses with Content-Length:0
Reviewed-by: michaelm

! src/java.net.http/share/classes/jdk/internal/net/http/MultiExchange.java
! test/jdk/java/net/httpclient/Response204.java