@Override
        public String toString() {
            return MoreObjects.toStringHelper(this)
                              .omitNullValues()
                              .add("mode", mode)
                              .add("tlsKeyPair", tlsKeyPair)
                              .add("trustedCertificates", trustedCertificates)
                              .toString();
        }
Returns an {@link SslContext} for the specified {@link SslContextMode} and {@link TlsKeyPair}.
Note that the returned {@link SslContext} should be released via
{@link ReferenceCountUtil#release(Object)} when it is no longer used.
core/src/main/java/com/linecorp/armeria/internal/common/SslContextFactory.java