API 때문에 openssl 버전 관련 문제 발생해서 알아보게되었던 것들. CURL_SSLVERSION CURL_SSLVERSION_DEFAULT (0) CURL_SSLVERSION_TLSv1 (1) CURL_SSLVERSION_SSLv2 (2) CURL_SSLVERSION_SSLv3 (3) CURL_SSLVERSION_TLSv1_0 (4) CURL_SSLVERSION_TLSv1_1 (5) CURL_SSLVERSION_TLSv1_2 (6). SSL 테스트 방법 ssltest.sh 127.0.0.1 443 http://www.tuxad.de/blog/archives/2014/11/19/openssl_updatesenhancements_for_rhel__centos_5/index.html