RFR: 8304962: sun/net/www/http/KeepAliveCache/B5045306.java: java.lang.RuntimeException: Failed: Initial Keep Alive Connection is not being reused [v2]

[Daniel Jeliński]

> This PR fixes intermittent test failures.
> 
> The test was broken by 95ca94436d12974d98b1b999f9cc8408d64cbe3c, which changed the `/firstCall` handler to return chunked response (second parameter to `sendResponseHeaders` was `0`). The test verifies the behavior of KeepAliveStreamCleaner, which only works on responses containing `Content-Length` header, and sometimes fails on chunked streams.
> 
> ~~Additionally I removed the unnecessary byte-to-character-to-byte conversion introduced in the same commit.~~
> Fixed the test server output. The PrintWriter printed the result of `toString()` call on a byte array instead of sending the byte array contents.
> 
> No failures after 50 test runs. Without the change the test failed 3 times in 10.

Daniel Jeliński has updated the pull request incrementally with one additional commit since the last revision:

  Add a comment about closing the strean

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13194/files
  - new: https://git.openjdk.org/jdk/pull/13194/files/a8ebe81a..c201f8a1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13194&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13194&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13194.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13194/head:pull/13194

PR: https://git.openjdk.org/jdk/pull/13194