Implement CONNECT-UDP toy server backend

2 new commandline flags:
* `connect_udp_proxy_targets` sets the allow list of allowed CONNECT-UDP proxy target servers. Must be set for toy server to allow CONNECT-UDP requests.
* `proxy_server_label` sets the server label for proxy error headers per RFC 9209. If not set, one is randomly generated.

PiperOrigin-RevId: 483394501
6 files changed
tree: 83f983450d49789f22a875c52492f500c301d5f2
  1. build/
  2. depstool/
  3. quiche/
  4. .bazelrc
  5. BUILD.bazel
  10. WORKSPACE.bazel


QUICHE stands for QUIC, Http, Etc. It is Google‘s production-ready implementation of QUIC, HTTP/2, HTTP/3, and related protocols and tools. It powers Google’s servers, Chromium, Envoy, and other projects. It is actively developed and maintained.

There are two public QUICHE repositories. Either one may be used by embedders, as they are automatically kept in sync:

To embed QUICHE in your project, platform APIs need to be implemented and build files need to be created. Note that it is on the QUICHE team's roadmap to include default implementation for all platform APIs and to open-source build files. In the meanwhile, take a look at open source embedders like Chromium and Envoy to get started:

To contribute to QUICHE, follow instructions at

QUICHE is only supported on little-endian platforms.