Question

我正在尝试对URL进行GET，并且每次都看到以下一致且可重现的行为。

当我从我的运营商处获得LTE连接时，一切都运行良好，没有任何问题。
每当我在工作时切换到我的wifi连接时，我都会从getResponseCode获得IO异常。（引起：android.system.ErrnoException：recvfrom失败：ECONNRESET（由对等方重置连接））。
工作中的Wi-Fi设置为通过防火墙和登录机制。所以，我认为这可能与它有关（即使登录会话有效约2天。因此，一旦从设备登录，应该没有任何问题）。但是，即使使用wi-fi工作，如果我只是尝试直接从设备上的浏览器获取URL内容，它会很好地检索页面（其余的api只返回一个非常小而简单的json格式化主体）。因此，这不是由于从设备到服务器的任何连接问题。
此外，在同一个应用程序中，我尝试使用webview而不是api调用加载该页面，并且加载得很好。

我试图将keep-alive设置为false（如另一个问题所示）并且没有帮助。

修改：发布我的主getJSon方法的代码：

public static String getJSON(String url, int timeout) {
    HttpURLConnection c = null;
    try {
        URL u = new URL(url);
        System.setProperty("http.keepAlive", "false");
        c = (HttpURLConnection) u.openConnection();

        CookieManager cookieManager = CookieManager.getInstance();
        String cookie = cookieManager.getCookie(u.getHost());
        c.setRequestProperty("Cookie", cookie);

        if(cookie == null || cookie.isEmpty()) {
            Log.i(TAG,"No authentication cookie. Not trying to GET from the self api.");
            return ""; //No authentication cookie. GET call will fail.
        }

        c.setRequestMethod("GET");
        c.setRequestProperty("Content-length", "0");
        c.setUseCaches(false);
        c.setAllowUserInteraction(false);
        c.setConnectTimeout(timeout);
        c.setReadTimeout(timeout);
        c.connect();
        int status = c.getResponseCode();
        Log.i(TAG,"Status Code in getJSON:" + status);
        switch (status) {
            case 200:
            case 201:
                BufferedReader br = new BufferedReader(new InputStreamReader(c.getInputStream()));
                StringBuilder sb = new StringBuilder();
                String line;
                while ((line = br.readLine()) != null) {
                    sb.append(line + "\n");
                }
                br.close();
                return sb.toString();
            default:
                Log.e(TAG,"Failure retrieving contents from URL:"+ url +" HTTP code:" + status);
                return "";
        }

    } catch (MalformedURLException ex) {
        Log.e(TAG,"Malformed URL:" + url);
    } catch (IOException ex) {
        Log.e(TAG,"IOException when retrieving user data from URL");
        ex.printStackTrace();
    } finally {
        if (c != null) {
            try {
                c.disconnect();
            } catch (Exception ex) {
                Log.e(TAG,"Exception when disconnecting url resource when retrieving user data from URL.");
            }
        }
    }
    return "";
}

异常堆栈跟踪：

05-19 10:20:30.154  18528-20770/com.example W/System.err﹕ java.net.SocketException: recvfrom failed: ECONNRESET (Connection reset by peer)
05-19 10:20:30.165  18528-20770/com.example W/System.err﹕ at libcore.io.IoBridge.maybeThrowAfterRecvfrom(IoBridge.java:592)
05-19 10:20:30.165  18528-20770/com.example W/System.err﹕ at libcore.io.IoBridge.recvfrom(IoBridge.java:556)
05-19 10:20:30.165  18528-20770/com.example W/System.err﹕ at java.net.PlainSocketImpl.read(PlainSocketImpl.java:485)
05-19 10:20:30.165  18528-20770/com.example W/System.err﹕ at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:37)
05-19 10:20:30.165  18528-20770/com.example W/System.err﹕ at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:237)
05-19 10:20:30.165  18528-20770/com.example W/System.err﹕ at com.android.okio.Okio$2.read(Okio.java:113)
05-19 10:20:30.165  18528-20770/com.example W/System.err﹕ at com.android.okio.RealBufferedSource.indexOf(RealBufferedSource.java:147)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.android.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:94)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:175)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:101)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:616)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:379)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:323)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:491)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.example.ConnectionHelper.getJSON(ConnectionHelper.java:98)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.example.RegistrationHelper.retrieveAndStoreUserData(RegistrationHelper.java:296)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.example.RegistrationHelper.registerDeviceWithBackend(RegistrationHelper.java:444)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.example.RegistrationHelper.access$400(RegistrationHelper.java:31)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.example.RegistrationHelper$1.doInBackground(RegistrationHelper.java:197)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at com.eclinic247.www.eclinicdr.RegistrationHelper$1.doInBackground(RegistrationHelper.java:177)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at android.os.AsyncTask$2.call(AsyncTask.java:288)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
05-19 10:20:30.166  18528-20770/com.example W/System.err﹕ Caused by: android.system.ErrnoException: recvfrom failed: ECONNRESET (Connection reset by peer)
05-19 10:20:30.167  18528-20770/com.example W/System.err﹕ at libcore.io.Posix.recvfromBytes(Native Method)
05-19 10:20:30.167  18528-20770/com.example W/System.err﹕ at libcore.io.Posix.recvfrom(Posix.java:161)
05-19 10:20:30.167  18528-20770/com.example W/System.err﹕ at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:250)
05-19 10:20:30.167  18528-20770/com.example W/System.err﹕ at libcore.io.IoBridge.recvfrom(IoBridge.java:553)
05-19 10:20:30.167  18528-20770/com.example W/System.err﹕ ... 24 more

Android HTTP URL连接从getResponseCode抛出IOException

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