We are running into some issues that seem to be affected by http2 and I want to turn it off temporarily to troubleshoot. I tried the registry keys outlined in this question but that did not help with Windows Server 2016.
1) start -> regedit
2) Navigate to the folder/path: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters
3) Under the Parameters folder, right-click the white-space, add 2 new DWORD (32-bit) values:
EnableHttp2Tls and EnableHttp2Cleartext
4) Ensure both new values have been set to 0 (disabled) by right-clicking the value and clicking modify...
5) Restart the OS
Another solution, if you are only testing, is run Chrome without http2 enabled. from start run, chrome --disable-http2
Also, apparently a fix is coming, we just have to be patient for the rollout. See THIS article
来源：https://stackoverflow.com/questions/44660634/how-to-disable-http-2-on-iis-of-windows-server-2016