RFR: 8276774: Cookie stored in CookieHandler not sent if user headers contain cookie [v5]

[Michael McMahon]

On Fri, 19 Nov 2021 10:12:15 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Hi,
>> 
>> Please find enclosed a patch that solves an unexpected interaction between server-set cookies and user-set cookies in the `java.net.HttpClient`.
>> 
>> In JDK 12 we fixed [JDK-8213189](https://bugs.openjdk.java.net/browse/JDK-8213189) to allow user-supplied header to take precedence over (that is, replace) system-headers. 
>> At the time the fact that server cookies would be added to the system-supplied headers by the `CookieHandler` (if present), and that a user-supplied cookie would therefore replace them (instead of simply appending to them)  was overlooked.
>> 
>> This fix proposes to restore the behavior of JDK 11 WRT to cookies - and arrange for user-supplied cookies to be appended to server-supplied cookies.
>
> Daniel Fuchs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   More review feedback

LGTM

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

Marked as reviewed by michaelm (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6408