I tried to compile this and the esnistuff I followed the instructions here https://defo.ie/building-curl-openssl-with-esni.html
I tried to test it like the instructions from the link above
$ ./testclient.sh -H ietf.org
Running ./testclient.sh at 20190828-072413
./testclient.sh Summary:
Looks like 1 ok's and 0 bad's.
But I only get
Running ./testclient.sh at 20210427-025718
./testclient.sh Summary:
Looks like 0 ok's and 0 bad's.
I got 0 ok's