openssl s_client -showcerts -connect support.neherdata.com:443
openssl s_client -showcerts -connect support.neherdata.com:80
https://developer.apple.com/library/archive/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/Introduction/Introduction.html#//apple_ref/doc/uid/TP40010220-CH12-BBCFIHFH