There is probably more C# and Java tools than Go. There has been more time for libraries to build up. But to the general thrust of your question, because that'

There is probably more C# and Java tools than Go. There has been more time for libraries to build up. But to the general thrust of your question, because that's the problem Google was trying to solve? The built in libraries make it quite easy to write applications that speak HTTP/HTTPS in a reasonably scalable way. Rust will probably be comparable in the future, but isn't quite there yet. C/C++ remains a bit difficult, although it should become a lot easier if the C++ networking TS makes it in.