Developer builds pure-Java QUIC stack to add HTTP/3 to async server framework

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A developer has built a from-scratch QUIC implementation in pure Java after finding no suitable existing options for the async, non-blocking server framework gumdrop. The Java ecosystem lacks a production-ready pure-Java QUIC library — the JDK's own support is client-only, Netty relies on native C bindings, and the only pure-Java option, Kwik, uses a blocking one-thread-per-connection model incompatible with gumdrop's design. The new stack includes packet protection, NewReno congestion control, 0-RTT, QPACK, HTTP/3 client and server support, and DNS-over-QUIC, all driven by a non-blocking event loop. It requires only Java 17 or later, with no native build steps or platform-specific binaries. The implementation is open-source and available on GitHub as part of the broader gumdrop framework.

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