Flupke is an open-source Java HTTP3 client and server implementation built on the Kwik QUIC library and QPACK for header compression, supporting HTTP/3 on Java 11 and higher. It initially functioned as a client but has supported HTTP/3 server functionality since June 2021, including experimental WebTransport support. The project is a work in progress by Peter Doornbosch, with releases available on Maven Central.
Flupke gives Java teams a ready-made HTTP/3 client and server stack on Java 11+, which matters because it packages QUIC and QPACK into a reusable library rather than forcing teams to assemble those pieces themselves. In the streaming delivery stack, that makes HTTP/3 experimentation more accessible for services that need low-latency transport or WebTransport tests. The clearest signal to watch is the Maven Central release line: Flupke publishes both the core library and flupke-samples, so version updates will show how quickly the project is maturing beyond its current work-in-progress status.
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