RFR: 8373677: Clear text HttpServer connection could fail fast if receiving SSL ClientHello [v2]

[Daniel Jeliński]

On Mon, 15 Dec 2025 17:52:56 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> The first byte of a SSL ClientHello handshake record is 0x16 (22).
>> If the first byte received on a HTTP/1.1 clear connection is 0x16, the HTTP server could fail fast, return 400 bad request and immediately close the connection.
>> 
>> This changeset extends the fail fast behaviour for other ineligible bytes, such as any byte corresponding to ASCII characters <= 31.
>
> Daniel Fuchs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   minor test fix - unused import + obsolete comment

src/jdk.httpserver/share/classes/sun/net/httpserver/ServerImpl.java line 740:

> 738:                 Request req;
> 739:                 try {
> 740:                     req = new Request(rawin, rawout, newconnection && !https);

I'd skip the `!https` check here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28827#discussion_r2624113873