@ForOverride
    protected SslContextBuilder newBuilderForServer() throws IOException {
        LOG.debug("Using certChainFile {}", serverSslConfig.getCertChainFile());
        try (InputStream keyInput = getKeyInputStream();
                InputStream certChainInput = new FileInputStream(serverSslConfig.getCertChainFile())) {
            return SslContextBuilder.forServer(certChainInput, keyInput);
        }
    }
This function is meant to call the correct overload of {@code SslContextBuilder.forServer()}.  It should not
apply any other customization.
zuul-core/src/main/java/com/netflix/zuul/netty/ssl/BaseSslContextFactory.java