Deprecate quic_ignore_user_agent_transport_parameter

This CL deprecates gfe2_reloadable_flag_quic_ignore_user_agent_transport_parameter, meaning that we will now completely ignore the Google-specific user agent transport parameter when it is received. This CL also changes clients to stop sending that transport parameter. Note that the user agent is still sent on HTTP request headers so there is no loss of information here.

PiperOrigin-RevId: 425912166
7 files changed
tree: 2233589686df23745bdb715ad63fbde177d77d12
  1. common/
  2. epoll_server/
  3. http2/
  4. quic/
  5. spdy/


QUICHE stands for QUIC, Http/2, 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.