6

我正在尝试从服务器注销。但它返回“0”响应代码,但有此异常。我正在使用 GET 动词来执行此操作。

日志猫

10-17 14:54:13.261: W/System.err(868): java.io.IOException: Received authentication challenge is null
10-17 14:54:13.284: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.processAuthHeader(HttpURLConnectionImpl.java:397)
10-17 14:54:13.284: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.processResponseHeaders(HttpURLConnectionImpl.java:345)
10-17 14:54:13.304: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:276)
10-17 14:54:13.324: W/System.err(868):  at libcore.net.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:479)
10-17 14:54:13.324: W/System.err(868):  at com.remote.synchronizer.haris.CustomHttpClient.executeGet(CustomHttpClient.java:131)
10-17 14:54:13.354: W/System.err(868):  at com.remote.synchronizer.haris.OptionsActivity$1$3$1.run(OptionsActivity.java:87)
10-17 14:54:13.364: W/System.err(868):  at android.os.Handler.handleCallback(Handler.java:605)
10-17 14:54:13.384: W/System.err(868):  at android.os.Handler.dispatchMessage(Handler.java:92)
10-17 14:54:13.384: W/System.err(868):  at android.os.Looper.loop(Looper.java:137)
10-17 14:54:13.404: W/System.err(868):  at android.app.ActivityThread.main(ActivityThread.java:4424)
10-17 14:54:13.424: W/System.err(868):  at java.lang.reflect.Method.invokeNative(Native Method)
10-17 14:54:13.424: W/System.err(868):  at java.lang.reflect.Method.invoke(Method.java:511)
10-17 14:54:13.454: W/System.err(868):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-17 14:54:13.474: W/System.err(868):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-17 14:54:13.474: W/System.err(868):  at dalvik.system.NativeStart.main(Native Method)
10-17 14:54:13.484: E/HTTP Response(868): java.io.IOException: Received authentication challenge is null

CustomHttpClient.java

public class CustomHttpClient {

    static HttpClient client = new DefaultHttpClient();
    static HttpURLConnection connection = null; 

    public static int executePost(String url, String postParameters)
    {
        int response=0;

        OutputStream output = null;
        try
        {
            connection = (HttpURLConnection)new URL(url).openConnection();
            System.setProperty("http.keepAlive", "false");
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Accept-Charset", "UTF-8");
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");

            connection.connect();

            output = connection.getOutputStream();
            output.write(postParameters.getBytes("UTF-8"));

            response=connection.getResponseCode();
        }
        catch(Exception e)
        {
            e.printStackTrace();
            Log.e("HTTP Response", e.toString());
        }
        finally {
            if(connection != null) {
                //  connection.disconnect(); 
                if (output != null) 
                    try { output.close(); } 
                catch (IOException logOrIgnore) {}
            }
        }

        return response;
    }

    public static int executeGet(String url)
    {
        int response=0;

        //HttpURLConnection connection = null;
        try
        {
            connection = (HttpURLConnection) new URL(url).openConnection();
            System.setProperty("http.keepAlive", "false");
            //connection.setRequestProperty("Accept-Charset", "UTF-8");
            connection.setDoInput(true);
            connection.setRequestMethod("GET");
            connection.connect();
            response=connection.getResponseCode();
        } 
        catch(Exception e)
        {
            e.printStackTrace();
            Log.e("HTTP Response", e.toString());
        }
        finally {
            if(connection != null) {
                //  connection.disconnect();
            }
        }
        return response;
    }

}

在此之前,我在 Gingerbird 2.3 中使用 DefaultHTTPClient,它运行良好,但在 ICS DefaultHTTPClient 中不起作用,所以我需要使用 HttpURLConnection。POST 动词工作正常。

4

3 回答 3

9

如果您在连接对象上第二次调用 .getResponseCode() ,您可以获得异常后的响应代码。这是因为第一次调用 .getResponseCode() 时会设置一个内部状态,使 .getResponseCode() 能够返回而不抛出异常。

例子:

HttpURLConnection connection = ...;
try {
    // Will throw IOException if server responds with 401.
    connection.getResponseCode(); 
} catch (IOException e) {
    // Will return 401, because now connection has the correct internal state.
    int responsecode = connection.getResponseCode(); 
}

我也在这里回答了这个问题:https ://stackoverflow.com/a/15972969/816017

于 2013-04-12T13:48:53.693 回答
3

HttpURLConnection.getResponseCode()java.io.IOException: Received authentication challenge is null遇到格式错误的 HTTP 401 标头时抛出。除了标头之外,您还从服务器接收WWW-Authenticate标头吗?请参阅IOException:“收到的身份验证质询为空”(Apache Harmony/Android)Content-LengthHTTP/1.1 401 Unauthorized

如果您无法对服务器进行更改,那么您可以捕获该异常(感谢https://stackoverflow.com/a/10904318/262462

try {
    response=connection.getResponseCode();
}
catch (java.io.IOException e) {
    if (e.getMessage().contains("authentication challenge")) {
        response = HttpsURLConnection.HTTP_UNAUTHORIZED;
    } else { throw e; }
}
于 2012-11-09T11:40:52.343 回答
1

发生此错误是因为服务器发送了 401(未经授权)但没有给出“WWW-Authenticate”,这是提示客户端下一步该做什么。“WWW-Authenticate”标头告诉客户端需要哪种身份验证(BasicDigest)。这在无头 http 客户端中通常不是很有用,但这就是标准的定义方式。发生错误是因为 lib 尝试解析“WWW-Authenticate”标头但不能。

如果您可以更改服务器,可能的解决方案:

  • 添加一个假的“WWW-Authenticate”标头,例如:WWW-Authenticate: Basic realm="fake". 这只是一种解决方法而不是解决方案,但它应该可以工作并且http客户端很满意。
  • 使用 HTTP 状态代码403而不是401. 它的语义是不一样的,通常在使用登录 401 时是一个正确的响应(详细讨论请参见此处),但它足够接近。

如果您无法更改服务器,可能的解决方案:

正如@ErikZ 在他的帖子中所写,您可以使用 try&catch

HttpURLConnection connection = ...;
try {
    // Will throw IOException if server responds with 401.
    connection.getResponseCode(); 
} catch (IOException e) {
    // Will return 401, because now connection has the correct internal state.
    int responsecode = connection.getResponseCode(); 
}

我还在这里发布了这个:java.io.IOException:未找到身份验证挑战

于 2014-02-03T17:58:09.263 回答