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

[Alan Bateman]

On Sun, 25 Feb 2024 14:20:54 GMT, Korov <duke at openjdk.org> wrote:

> Make sun.net.www.MessageHeader final, and replace C-style array type declaration with Java-style array declaration.

The motivation for JDK-8325361 is to remove `@SuppressWarnings("this-escape")` from the constructor.

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PR Comment: https://git.openjdk.org/jdk/pull/17997#issuecomment-1962958347