RFR: 8286386: Address possibly lossy conversions in java.net.http [v2]

[Daniel Fuchs]

> In relation to [JDK-8244681](https://bugs.openjdk.java.net/browse/JDK-8244681), please find here a patch that addresses possibly lossy conversions in java.net.http

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

  Use char constant to avoid casts

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8656/files
  - new: https://git.openjdk.java.net/jdk/pull/8656/files/6ef906e0..bbcf238b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8656&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8656&range=00-01

  Stats: 29 lines in 1 file changed: 5 ins; 15 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8656.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8656/head:pull/8656

PR: https://git.openjdk.java.net/jdk/pull/8656