참고 : docs.oracle.com/javase/7/docs/api/javax/net/ssl/HttpsURLConnection.html HttpsURLConnection (Java Platform SE 7 ) Returns the server's principal which was established as part of defining the session. Note: Subclasses should override this method. If not overridden, it will default to returning the X500Principal of the server's end-entity certificate for certificate-bas docs.oracle.com (코드 예시)..