How to get a remote server SSL certificate
openssl s_client -connect {HOSTNAME}:{PORT} -showcerts
Openssl
scripts/extract-cert.c:21:10: fatal error: openssl/bio.h: No such file or directory
sudo apt-get install -y libssl-dev
openssl s_client -connect {HOSTNAME}:{PORT} -showcerts
sudo apt-get install -y libssl-dev