RFR: 8259631: Reapply pattern match instanceof use in HttpClientImpl

Tue Jan 12 16:10:06 UTC 2021

Hi,

The proposed change adds back [1] `instanceof` pattern match use to `HttpClientImpl` class. It was previously removed by [JDK-8258696](https://bugs.openjdk.java.net/browse/JDK-8258696) due to docs build failure.

Aleksei

[1] `git rollback be41468c --no-commit`

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Commit messages:
 - Revert "8258696: Temporarily revert use of pattern match instanceof until docs-reference is fixed"

Changes: https://git.openjdk.java.net/jdk/pull/2051/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2051&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259631
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2051.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2051/head:pull/2051

PR: https://git.openjdk.java.net/jdk/pull/2051