我正在尝试发送一个x.509客户端证书，其中包含zuul forwardproxy的传出请求。证书包含在我加载的密钥库中 loadKeyMaterial() 在sslcontext上。
代码如下：

@Bean
    public CloseableHttpClient httpClient() throws Throwable {
        SSLContext sslcontext = SSLContexts.custom()
                .loadKeyMaterial(new File(keyStorePath), keyStorePass, keyStorePass, new PrivateKeyStrategy() {
                    @Override
                    public String chooseAlias(Map<String, PrivateKeyDetails> aliases, Socket socket) {
                        return alias;
                    }
                })
                .loadTrustMaterial(new File(keyStorePath), keyStorePass, new TrustSelfSignedStrategy())
                .build();

        SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                sslcontext,
                new String[] { "TLSv1.3" },
                new String[] { "TLS_DHE_RSAWITH_AES_256_GCM_SHA384" },
                SSLConnectionSocketFactory.getDefaultHostnameVerifier());

        return HttpClients.custom().setSSLSocketFactory(sslsf)
           .build();
    }

当我提出测试请求时 Received fatal alert: handshake_failure 在详细的日志上我看到了这个消息 No X.509 certificate for client authentication, use empty Certificate message instead . 如何使httpclient将证书作为x.509客户端证书发送？