I found the apiserver has a flag named api-prefix, so I have tried to use it.

I set the flag to api1 and to keep compatible, I modified the flags of other components like below:

kubelet: --api-servers=https://master:6443/api1
kube-proxy: --master=https://master:6443/api1

I also tried to modified the flag of kube-controller-manager and kube-scheduler, but the error below was reported:

host must be a URL

So I keep the flag of these two components as before.

Now I am wondering about it is because the flag api-prefix is not implemented or the way I used them is wrong?