public ProviderBuilder defaultTlsProtocol(String defaultTlsProtocol) {
            this.defaultTlsProtocol = defaultTlsProtocol;
            return this;
        }
Specifies what the default TLS protocol should be for SSLContext identifiers
{@code TLS}, {@code SSL}, and {@code Default}.
common/src/main/java/org/conscrypt/Conscrypt.java