RFR: 8303965: java.net.http.HttpClient should reset the stream if response headers contain malformed header fields [v2]

[Daniel Fuchs]

> According to RFC 7540:
> 
> Endpoints MUST treat a request or response that contains
> undefined or invalid pseudo-header fields as malformed (Section 8.1.2.6).
> 
> Section-8.1.2.6 Malformed requests or responses that are detected MUST be treated as a stream error (Section 5.4.2) of type PROTOCOL_ERROR.
> 
> The current behavior is to close the connection with protocol error. This change makes it reset the stream instead.

Daniel Fuchs has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - add bug id to test
 - Merge branch 'master' into MalformedResponse-8303965
 - 8303965

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12976/files
  - new: https://git.openjdk.org/jdk/pull/12976/files/4e76e29d..101dbc64

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12976&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12976&range=00-01

  Stats: 66305 lines in 743 files changed: 57087 ins; 2356 del; 6862 mod
  Patch: https://git.openjdk.org/jdk/pull/12976.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12976/head:pull/12976

PR: https://git.openjdk.org/jdk/pull/12976