static TlsProvider of(TlsKeyPair tlsKeyPair) {
        requireNonNull(tlsKeyPair, "tlsKeyPair");
        return builder().keyPair(tlsKeyPair).build();
    }
Returns a {@link TlsProvider} which always returns the specified {@link TlsKeyPair}.
core/src/main/java/com/linecorp/armeria/common/TlsProvider.java