RFR: 8368695: Support 101 switching protocol in jdk.httpserver [v3]

[Josiah Noel]

On Mon, 13 Oct 2025 16:02:28 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Josiah Noel has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update UpgradeInputStream.java
>
> src/jdk.httpserver/share/classes/sun/net/httpserver/ExchangeImpl.java line 172:
> 
>> 170:         if (upgrade) {
>> 171:             uis_orig = new UpgradeInputStream(this, ris);
>> 172:         } else if (reqContentLen == -1L) {
> 
> Are we sure that `upgrade` and `reqConteLength != 0` are always exclusive? IIRC this is not the case for the HTTP/2 upgrade. The request body (if present) is sent through HTTP/1.1 and only after that is the connection upgraded to HTTP/2 - if the upgrade is accepted. Also the handler could very well ignore the upgrade and continue with HTTP/1.1.
> 
> It seems we need more discussion on whether we should support connection upgrade and what kind of API would be needed for that.

GET requests usually don't have bodies

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PR Review Comment: https://git.openjdk.org/jdk/pull/27751#discussion_r2426811348