sgcWebSockets supports HTTP/2 protocol on Server and Client components, implementation is made in 100% pure Delphi code without using any external library. We have tested our HTTP/2 implementation using h2spec which is a great tool for testing HTTP/2 protocol
https://github.com/summerwind/h2spec
The sgcWebSockets HTTP/2 Server and Client components have passed the 100% of h2spec tests. You can check the HTTP/2 test reports following the next link