使用 Volley 时出现 SSL 异常

我在 Android 中使用 Volley 来执行我的应用程序请求。不幸的是，我收到以下错误：

com.android.volley.NoConnectionError: javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x61e15f78: Failure in SSL library, usually a protocol error
    error:1407743E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert inappropriate fallback (external/openssl/ssl/s23_clnt.c:744 0x5b647c58:0x00000000)

我用的是两个Fragments，里面一个ViewPager，在 onResume 期间请求其内容。请求 url 基本相同，但查询参数（设置内容类型，例如趋势与热门）。

url 的格式为https://host/api/content?type={hot/trending}。授权是通过请求标头完成的。

这个异常的奇怪之处在于，两个请求中只有一个失败，并且会不时改变哪个请求。在我在它们之间添加延迟后，异常停止发生（奇怪地指向某种竞争条件？）。但这似乎是一个糟糕的解决方法，我想以正确的方式解决这个问题。

有什么想法可能是什么原因造成的吗？

EDIT:

请求以标准方式创建，使用提供队列的单例，如下所示：

final RequestQueue requestQueue = RequestQueueSingleton.getInstance(getActivity()).getRequestQueue();
final GsonRequestGet<SearchApiWrapper> gsonRequest = new GsonRequestGet<>(clazz, url,successListener, errorListener);
gsonRequest.setRetryPolicy(new DefaultRetryPolicy(3000, 3, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
gsonRequest.setTag(mTag);
requestQueue.add(gsonRequest);

这是单例类：

public class RequestQueueSingleton {

    private static RequestQueueSingleton mInstance;
    private RequestQueue mRequestQueue;
    private Context mContext;

    public RequestQueueSingleton(Context context) {
        mContext = context;
        mRequestQueue = getRequestQueue();
    }

    /**
     * Returns a instance of this singleton
     */
    public static synchronized RequestQueueSingleton getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new RequestQueueSingleton(context);
        }
        return mInstance;
    }

    /**
     * Returns instance of the request queue
     */
    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(mContext.getApplicationContext());
        }
        return mRequestQueue;
    }
}

经过我们的评论，也许这可以帮助您：

Your requestQueue:

static {
    requestQueue = Volley.newRequestQueue(Application.getContext(), new HurlStack(null, ClientSSLSocketFactory.getSocketFactory()));
}

The ClientSSLSocketFactory:

public class ClientSSLSocketFactory extends SSLCertificateSocketFactory {
    private SSLContext sslContext;

    public static SSLSocketFactory getSocketFactory(){
        try
        {
            X509TrustManager tm = new X509TrustManager() {
                public void checkClientTrusted(X509Certificate[] xcs, String string) throws CertificateException {}

                public void checkServerTrusted(X509Certificate[] xcs, String string) throws CertificateException {}

                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
            };
            sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, new TrustManager[] { tm }, null);

            SSLSocketFactory ssf = ClientSSLSocketFactory.getDefault(10000, new SSLSessionCache(Application.getInstance()));

            return ssf;
        } catch (Exception ex) {
            return null;
        }
    }

    @Override
    public Socket createSocket(Socket socket, String host, int port, boolean autoClose) throws IOException, UnknownHostException {
        return sslContext.getSocketFactory().createSocket(socket, host, port, autoClose);
    }

    @Override
    public Socket createSocket() throws IOException {
        return sslContext.getSocketFactory().createSocket();
    }
}