RFR: 8252304: Seed an HttpRequest.Builder from an existing HttpRequest [v10]

[Patrick Concannon]

> Hi,
> 
> Could someone please review our code for JDK-8252304: 'Seed an HttpRequest.Builder from an existing HttpRequest'?
> 
> This RFR proposes a new factory method for creating a new `HttpRequest` builder from an existing `HttpRequest`.
> This method can be used to build a new request equivalent to the given request, but with different attributes. For instance, it will allow the user to take an existing request and add or change a particular header, provide a new `URI`, etc.
> 
> 
> Kind regards,
> Patrick & Chris

Patrick Concannon has updated the pull request incrementally with one additional commit since the last revision:

  8252304: Fixed typo in newBuilder example; updated filter test cases to check for value to remove

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1059/files
  - new: https://git.openjdk.java.net/jdk/pull/1059/files/960eebc3..68ea89e1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1059&range=09
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1059&range=08-09

  Stats: 35 lines in 3 files changed: 19 ins; 4 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1059.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1059/head:pull/1059

PR: https://git.openjdk.java.net/jdk/pull/1059