RFR: 8263506: Make sun.net.httpserver.UnmodifiableHeaders unmodifiable [v2]

[Julia Boes]

On Mon, 22 Mar 2021 16:36:55 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> I guess this presumes that no reference to `headers` escapes? Can that be assumed?
>
> Yes - it's private - and that wasn't a problem before - was it? The problem was the put method that still put things into the map - and that will be taken care of if the map is unmodifiable.

Added (back) a `headers` field as per you suggestion, which is only accessed by `getFirst`.

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PR: https://git.openjdk.java.net/jdk/pull/3032