我用的是 Apache HTTP client （版本 4.5.13 )在 Java 8 执行post调用，该调用要求客户端使用存储在.pfx文件中的证书进行身份验证。
这是我使用的代码：

public static void performClientRequest() throws Exception {
    //Trust Strategy to accept any server certificate
    TrustStrategy trustStrategy = new TrustStrategy() {
        public boolean isTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            return true;
        }
    };

    //Load PFX client certificate
    KeyStore clientStore  = KeyStore.getInstance("PKCS12"); 
    InputStream instream = new FileInputStream("C:\\client.pfx");
    try {
        clientStore.load(instream, null);
    } finally {
        instream.close();
    }

    //Create ssl context with key store and trust strategy 
    SSLContext sslContext = SSLContexts.custom()
            .loadKeyMaterial(clientStore, null)
            .loadTrustMaterial(trustStrategy)
            .build();

    //Create ssl socket factory from context
    SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE);

    //Create HTTP client
    HttpClient httpClient = HttpClients.custom()
            .setSSLSocketFactory(sslSocketFactory)
            .build();

    //Perform call
    URI url = new URI("https://mysite.foo"); 
    HttpPost request = new HttpPost(url);

    request.setHeader("Content-Type","application/json"); 
    request.setHeader("Accept", "application/json");

    String body = "...";
    StringEntity bodyEntity = new StringEntity(body);
    request.setEntity(bodyEntity);

    HttpResponse response = httpClient.execute(request);
    HttpEntity entity = response.getEntity();

    System.out.println("----------------------------------------");
    System.out.println(response.getStatusLine());
    EntityUtils.consume(entity);
}

我以前使用过这段代码，当时它运行得很好，但现在我尝试重新使用它，它只是不发送证书，服务器回复为：

HTTP/1.1 403 No client certificate supplied

我如何调试这个并发现为什么证书没有被发送？
注意：我在 C# 以及使用 Postman ，在这两种情况下，它都工作得很好，因此对服务器的客户机证书身份验证工作正常，但在我的java实现中不工作。