openssl s_client -state -connect postman-echo.com:443 | openssl x509 -text
openssl x509 -inform DER -in cacert.der -out cacert.pem
openssl x509 -inform der -in cacert.der -out cacert.crt
openssl s_client -state -connect postman-echo.com:443 | openssl x509 -text
openssl x509 -inform DER -in cacert.der -out cacert.pem
openssl x509 -inform der -in cacert.der -out cacert.crt