[jdk17u-dev] RFR: 8306040: HttpResponseInputStream.available() returns 1 on empty stream

[Sonia Zaldana Calles]

Hi all, 

This pull request contains a backport of commit [acaab6fd74f507bb6b18167505d88e505bdf24bd](https://github.com/openjdk/jdk/commit/acaab6fd74f507bb6b18167505d88e505bdf24bd) from the [openjdk/jdk](https://github.com/openjdk/jdk) repository. 

Testing: using the reproducer linked in the issue, I was able to verify the patch. 
I also ran the additional test case included in the original commit and all tests in ```test/jdk/java/net/httpclient/```. 

Note that patch is not clean because http tests and related classes have since been moved into a package of their own (namely ```/test/jdk/java/net/httpclient/lib```), which doesn’t exist in jdk 17. 

Only change introduced in my patch from the original commit: 

@@ -25,7 +25,7 @@
  * @test
  * @bug 8306040
  * @summary HttpResponseInputStream.available() returns 1 on empty stream
- * @library /test/lib /test/jdk/java/net/httpclient/lib
+ * @library /test/lib
  * @run junit/othervm HttpInputStreamAvailableTest
  *
  */

-------------

Commit messages:
 - Backport acaab6fd74f507bb6b18167505d88e505bdf24bd

Changes: https://git.openjdk.org/jdk17u-dev/pull/2263/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2263&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306040
  Stats: 163 lines in 2 files changed: 161 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2263.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2263/head:pull/2263

PR: https://git.openjdk.org/jdk17u-dev/pull/2263