RFR: 8325361: Make sun.net.www.MessageHeader final

[Korov]

On Thu, 29 Feb 2024 18:28:31 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Make sun.net.www.MessageHeader final, and remove `@SuppressWarnings("this-escape")`
>
> The test results came back green. So please integrate!

Hello @dfuch ， sorry for replying so late, I'am not a committer so I need your help to execute the next commant `/sponsor`, thank you very much for your help.

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PR Comment: https://git.openjdk.org/jdk/pull/18060#issuecomment-1972285992