RFR: 8349910: Implement HTTP/3 for the HTTP Client API

[Jaikiran Pai]

On Tue, 22 Apr 2025 19:11:24 GMT, Artur Barashev <abarashev at openjdk.org> wrote:

>> test/jdk/java/net/httpclient/http3/H3QuicTLSConnection.java line 96:
>> 
>>> 94:         //System.setProperty("javax.net.ssl.trustStore", KEYSTORE);
>>> 95:         //System.setProperty("javax.net.ssl.trustStorePassword", PASSWORD);
>>> 96:         SSLContext context = new SimpleSSLContext().get();
>> 
>> FYI: We are moving away from using keystore files to generating keystores on the fly as needed. `SimpleSSLContext` is using a keystore file.
>
> `MD5NotAllowedInTLS13CertificateSignature` contains an example.

A lot of (existing) HttpClient tests in `test/jdk/java/net/httpclient` currently use this `SimpleSSLContext` construct to read the `testkeys` keystore that's available in the JDK repo's test directory. Moving to a dynamically created keystore instead of a keystore that's committed in the JDK repo seems reasonable. I think it would be better to do that as a separate task in future, since that would involve updating these existing tests to use this new mechanism too.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24751#discussion_r2055484535