Method SSLThreadLocks

external/cpp-httplib/httplib.h:7268–7272

        class SSLThreadLocks {
        public:
            SSLThreadLocks() {
                openSSL_locks_ =
                    std::make_shared<std::vector<std::mutex>>(CRYPTO_num_locks());
                CRYPTO_set_locking_callback(locking_callback);
            }

            ~SSLThreadLocks() { CRYPTO_set_locking_callback(nullptr); }