https://www.sslshopper.com/certificate-decoder.html  <--키값확인


http://book.mixu.net/node/ch10.html <---good http https example


https://nodejs.org/api/tls.html <--키값 생성 및 적용


키값 생성


openssl genrsa -out ryans-key.pem 2048  <- key


openssl req -new -sha256 -key ryans-key.pem -out ryans-csr.pem  <-- csr


openssl x509 -req -days 36500 -in ryans-csr.pem -signkey ryans-key.pem -out ryans-cert.pem <-- sert