There's a C++ implementation here, but I'm not sure how complete it is: https://github.com/http2d/core https://github.com/http2d/core I think nginx and Chrome

There's a C++ implementation here, but I'm not sure how complete it is: https://github.com/http2d/core https://github.com/http2d/core I think nginx and Chrome support SPDY which HTTP 2.0 was based on, so that performance should be able to be tested and be fairly representative of what we can expect.