Android IOException 与 http...但它仍然有效

发布于 2025-01-03 11:02:03 字数 14572 浏览 1 评论 0原文

我正在使用 httpclient 与 Web 服务器通信，但偶尔会收到 IOException，但奇怪的是，该命令仍然可以到达 Web 服务器。事实上，我什至通常会从服务器返回有效的数据响应以及 IOException。我应该如何处理 IOException？

这是我的代码，以防万一我做错了：

DefaultHttpClient client = new DefaultHttpClient();
CookieSyncManager.getInstance().startSync();
HttpContext localContext = new BasicHttpContext();

String password = db.getWebPassword();
String username = db.getWebUsername();

HttpGet httpGet = new HttpGet(url);

final HttpParams httpParams = client.getParams();

// try playing with the timesouts, but I don't think I know what I am doing...
HttpConnectionParams.setConnectionTimeout(httpParams, 5000);
HttpConnectionParams.setSoTimeout(httpParams, 5000);

Integer responseCode = 0;
try 
{
    HttpResponse execute;
    UsernamePasswordCredentials creds = new UsernamePasswordCredentials(username, password);
    client.getCredentialsProvider().setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT), creds);
    execute = client.execute(httpGet);
    HttpEntity entity = execute.getEntity(); // often catches an IOException here     
    Log.d(MY_DEBUG_TAG, "Execute complete: " + entity.toString());
    responseCode = execute.getStatusLine().getStatusCode();
    Log.d(MY_DEBUG_TAG, "Response Code: " + responseCode);
    if (responseCode == 401)
    {
         response = "ERROR";
     Toast.ShowToast("Username/Password error.", pa);
    }

    InputStream content = execute.getEntity().getContent();

    Log.d(MY_DEBUG_TAG, "Reading response");
    BufferedReader buffer = new BufferedReader(
              new InputStreamReader(content));
    String s = "";
    while ((s = buffer.readLine()) != null) 
    {
         response += s;
    }
    // remove all html if possible
    response = android.text.Html.fromHtml(response).toString();
    Log.d(MY_DEBUG_TAG, "Response = " + response);
}
catch (ClientProtocolException e) 
{
     Log.e(MY_ERROR_TAG, "ClientProtocolException: " + e.getMessage());
     Toast.ShowToast("Error connecting to server.", pa);
}
catch (IOException e)
{
       Log.e(MY_ERROR_TAG, "IOException: " + e.getMessage());
     Toast.ShowToast("Error connecting to server.", pa);
}

根据请求添加堆栈跟踪：

java.net.SocketTimeoutException
    at org.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:564)
    at org.apache.harmony.luni.net.SocketInputStream.read(SocketInputStream.java:88)
    at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103)
    at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:191)
    at org.apache.http.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:82)
    at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:174)
    at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:179)
    at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:235)
    at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:259)
    at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:279)
    at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:121)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:410)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
    at com.PowerHomeConnectorForAndroid.Network$GetHttpData.doInBackground(Network.java:215)
    at com.PowerHomeConnectorForAndroid.Network$GetHttpData.doInBackground(Network.java:1)
    at android.os.AsyncTask$2.call(AsyncTask.java:185)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
    at java.lang.Thread.run(Thread.java:1096)

记住，这里的问题是我正在捕获异常，但代码仍然有效，我可以看到服务器收到命令，我什至从服务器获取响应。

我做了一些wireshark嗅探，好的会话和坏的会话看起来几乎相同，除了最终响应返回手机所需的时间。由于异常实际上是 SocketTimeoutException，我认为这是有道理的，但实际情况是响应确实返回并且手机将其作为同一会话的一部分接受，那么到底发生了什么？有没有例外？

这是wireshark 捕获（抱歉左右滚动）第一个捕获是错误的会话，第二个捕获是良好的会话。

      IOException                                                                                                                                                           x     Good                              
1     http-alt     0             70.165.69.220     192.168.1.110     TCP     66     20180 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1                 x     31     http-alt     0            70.165.69.220     192.168.1.110     TCP     66     52220 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
2     20180        0.000039      192.168.1.110     70.165.69.220     TCP     66     http-alt > 20180 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1      x     32     52220        0.000043     192.168.1.110     70.165.69.220     TCP     66     http-alt > 52220 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
3     http-alt     0.05784       70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0                                      x     33     http-alt     0.22131      70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0
4     http-alt     0.153949      70.165.69.220     192.168.1.110     HTTP   196     GET /ph-cgi/clogin HTTP/1.1                                                             x     34     http-alt     0.350917     70.165.69.220     192.168.1.110     HTTP   196     GET /ph-cgi/clogin HTTP/1.1 
5     20180        0.161902      192.168.1.110     70.165.69.220     HTTP  2967     HTTP/1.0 200 OK  (text/html)                                                            x     35     52220        0.3841       192.168.1.110     70.165.69.220     HTTP  2967     HTTP/1.0 200 OK  (text/html)
6     20180        0.161992      192.168.1.110     70.165.69.220     TCP     54     http-alt > 20180 [FIN, ACK] Seq=2914 Ack=143 Win=65536 Len=0                            x     36     52220        0.38419      192.168.1.110     70.165.69.220     TCP     54     http-alt > 52220 [FIN, ACK] Seq=2914 Ack=143 Win=65536 Len=0
7     http-alt     0.209671      70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [ACK] Seq=143 Ack=1461 Win=65536 Len=0                                 x     37     http-alt     0.614323     70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [ACK] Seq=143 Ack=1461 Win=65536 Len=0
8     http-alt     0.253024      70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [ACK] Seq=143 Ack=2915 Win=64000 Len=0                                 x     38     http-alt     0.614456     70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [ACK] Seq=143 Ack=2915 Win=64000 Len=0
9     http-alt     0.373148      70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [FIN, ACK] Seq=143 Ack=2915 Win=64000 Len=0                            x     39     http-alt     0.746923     70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [FIN, ACK] Seq=143 Ack=2915 Win=64000 Len=0
10    20180        0.373172      192.168.1.110     70.165.69.220     TCP     54     http-alt > 20180 [ACK] Seq=2915 Ack=144 Win=65536 Len=0                                 x     40     52220        0.746944     192.168.1.110     70.165.69.220     TCP     54     http-alt > 52220 [ACK] Seq=2915 Ack=144 Win=65536 Len=0
11    http-alt     0.38402       70.165.69.220     192.168.1.110     TCP     66     53091 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1                 x     41     http-alt     0.762482     70.165.69.220     192.168.1.110     TCP     66     64314 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
12    53091        0.384069      192.168.1.110     70.165.69.220     TCP     66     http-alt > 53091 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1      x     42     64314        0.762517     192.168.1.110     70.165.69.220     TCP     66     http-alt > 64314 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
13    http-alt     0.425956      70.165.69.220     192.168.1.110     TCP     60     53091 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0                                      x     43     http-alt     1.015043     70.165.69.220     192.168.1.110     TCP     60     64314 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0
14    http-alt     0.511349      70.165.69.220     192.168.1.110     TCP    349     [TCP segment of a reassembled PDU]                                                      x     44     http-alt     1.064351     70.165.69.220     192.168.1.110     TCP    349     [TCP segment of a reassembled PDU]
15    53091        0.704456      192.168.1.110     70.165.69.220     TCP     54     http-alt > 53091 [ACK] Seq=1 Ack=296 Win=65536 Len=0                                    x     45     64314        1.263922     192.168.1.110     70.165.69.220     TCP     54     http-alt > 64314 [ACK] Seq=1 Ack=296 Win=65536 Len=0
16    http-alt     2.562688      70.165.69.220     192.168.1.110     HTTP    99     POST /ph-cgi/cauth HTTP/1.1  (application/x-www-form-urlencoded)                        x     46     http-alt     3.088689     70.165.69.220     192.168.1.110     HTTP    99     POST /ph-cgi/cauth HTTP/1.1  (application/x-www-form-urlencoded)
17    53091        2.567888      192.168.1.110     70.165.69.220     HTTP   355     HTTP/1.0 200 OK  (text/html)                                                            x     47     64314        3.093318     192.168.1.110     70.165.69.220     HTTP   355     HTTP/1.0 200 OK  (text/html)
18    53091        2.568447      192.168.1.110     70.165.69.220     TCP     54     http-alt > 53091 [FIN, ACK] Seq=302 Ack=341 Win=65536 Len=0                             x     48     64314        3.093858     192.168.1.110     70.165.69.220     TCP     54     http-alt > 64314 [FIN, ACK] Seq=302 Ack=341 Win=65536 Len=0
19    http-alt     2.612071      70.165.69.220     192.168.1.110     TCP     60     53091 > http-alt [ACK] Seq=341 Ack=303 Win=65280 Len=0                                  x     49     http-alt     3.313276     70.165.69.220     192.168.1.110     TCP     60     64314 > http-alt [ACK] Seq=341 Ack=303 Win=65280 Len=0
20    http-alt     2.665338      70.165.69.220     192.168.1.110     TCP     66     34654 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1                 x     50     http-alt     3.410808     70.165.69.220     192.168.1.110     TCP     66     33703 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
21    34654        2.665385      192.168.1.110     70.165.69.220     TCP     66     http-alt > 34654 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1      x     51     33703        3.410851     192.168.1.110     70.165.69.220     TCP     66     http-alt > 33703 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
22    http-alt     2.665487      70.165.69.220     192.168.1.110     TCP     60     53091 > http-alt [FIN, ACK] Seq=341 Ack=303 Win=65280 Len=0                             x     52     http-alt     3.41086      70.165.69.220     192.168.1.110     TCP     60     64314 > http-alt [FIN, ACK] Seq=341 Ack=303 Win=65280 Len=0
23    53091        2.6655        192.168.1.110     70.165.69.220     TCP     54     http-alt > 53091 [ACK] Seq=303 Ack=342 Win=65536 Len=0                                  x     53     64314        3.41087      192.168.1.110     70.165.69.220     TCP     54     http-alt > 64314 [ACK] Seq=303 Ack=342 Win=65536 Len=0
24    http-alt     2.709857      70.165.69.220     192.168.1.110     TCP     60     34654 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0                                      x     54     http-alt     3.715974     70.165.69.220     192.168.1.110     TCP     60     33703 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0
25    http-alt     2.916243      70.165.69.220     192.168.1.110     HTTP   308     GET /ph-cgi/eval?formula=ph_macro%28%27TESTING%27%29 HTTP/1.1                           x     55     http-alt     3.830971     70.165.69.220     192.168.1.110     HTTP   308     GET /ph-cgi/eval?formula=ph_macro%28%27TESTING%27%29 HTTP/1.1 
26    34654        3.114457      192.168.1.110     70.165.69.220     TCP     54     http-alt > 34654 [ACK] Seq=1 Ack=255 Win=65536 Len=0                                    x     56     33703        3.858623     192.168.1.110     70.165.69.220     HTTP   153     HTTP/1.0 200 OK  (text/html)
27    http-alt     11.023287     70.165.69.220     192.168.1.110     TCP     60     34654 > http-alt [FIN, ACK] Seq=255 Ack=1 Win=65536 Len=0                               x     57     33703        3.858729     192.168.1.110     70.165.69.220     TCP     54     http-alt > 33703 [FIN, ACK] Seq=100 Ack=255 Win=65536 Len=0
28    34654        11.023305     192.168.1.110     70.165.69.220     TCP     54     http-alt > 34654 [ACK] Seq=1 Ack=256 Win=65536 Len=0                                    x     58     http-alt     4.114668     70.165.69.220     192.168.1.110     TCP     60     33703 > http-alt [ACK] Seq=255 Ack=101 Win=65536 Len=0
29    34654        34.882577     192.168.1.110     70.165.69.220     TCP     54     http-alt > 34654 [FIN, ACK] Seq=1 Ack=256 Win=65536 Len=0                               x     59     http-alt     4.153392     70.165.69.220     192.168.1.110     TCP     60     33703 > http-alt [FIN, ACK] Seq=255 Ack=101 Win=65536 Len=0
30    http-alt     34.926041     70.165.69.220     192.168.1.110     TCP     60     34654 > http-alt [ACK] Seq=256 Ack=2 Win=65536 Len=0                                    x     60     33703        4.153402     192.168.1.110     70.165.69.220     TCP     54     http-alt > 33703 [ACK] Seq=101 Ack=256 Win=65536 Len=0

所以，也许我应该忽略 SocketTimeoutException？？？听起来有点危险……

原文

I am using the httpclient to talk to a web server, but I occasionally get an IOException, but the strange thing is, the command still makes it to the web server. In fact, I even usually get a valid data response back from the server, along with the IOException. How should I treat IOExceptions?

Here's my code in case it's something I'm doing wrong:

DefaultHttpClient client = new DefaultHttpClient();
CookieSyncManager.getInstance().startSync();
HttpContext localContext = new BasicHttpContext();

String password = db.getWebPassword();
String username = db.getWebUsername();

HttpGet httpGet = new HttpGet(url);

final HttpParams httpParams = client.getParams();

// try playing with the timesouts, but I don't think I know what I am doing...
HttpConnectionParams.setConnectionTimeout(httpParams, 5000);
HttpConnectionParams.setSoTimeout(httpParams, 5000);

Integer responseCode = 0;
try 
{
    HttpResponse execute;
    UsernamePasswordCredentials creds = new UsernamePasswordCredentials(username, password);
    client.getCredentialsProvider().setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT), creds);
    execute = client.execute(httpGet);
    HttpEntity entity = execute.getEntity(); // often catches an IOException here     
    Log.d(MY_DEBUG_TAG, "Execute complete: " + entity.toString());
    responseCode = execute.getStatusLine().getStatusCode();
    Log.d(MY_DEBUG_TAG, "Response Code: " + responseCode);
    if (responseCode == 401)
    {
         response = "ERROR";
     Toast.ShowToast("Username/Password error.", pa);
    }

    InputStream content = execute.getEntity().getContent();

    Log.d(MY_DEBUG_TAG, "Reading response");
    BufferedReader buffer = new BufferedReader(
              new InputStreamReader(content));
    String s = "";
    while ((s = buffer.readLine()) != null) 
    {
         response += s;
    }
    // remove all html if possible
    response = android.text.Html.fromHtml(response).toString();
    Log.d(MY_DEBUG_TAG, "Response = " + response);
}
catch (ClientProtocolException e) 
{
     Log.e(MY_ERROR_TAG, "ClientProtocolException: " + e.getMessage());
     Toast.ShowToast("Error connecting to server.", pa);
}
catch (IOException e)
{
       Log.e(MY_ERROR_TAG, "IOException: " + e.getMessage());
     Toast.ShowToast("Error connecting to server.", pa);
}

Stack trace added as per request:

java.net.SocketTimeoutException
    at org.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:564)
    at org.apache.harmony.luni.net.SocketInputStream.read(SocketInputStream.java:88)
    at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103)
    at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:191)
    at org.apache.http.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:82)
    at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:174)
    at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:179)
    at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:235)
    at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:259)
    at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:279)
    at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:121)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:410)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
    at com.PowerHomeConnectorForAndroid.Network$GetHttpData.doInBackground(Network.java:215)
    at com.PowerHomeConnectorForAndroid.Network$GetHttpData.doInBackground(Network.java:1)
    at android.os.AsyncTask$2.call(AsyncTask.java:185)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
    at java.lang.Thread.run(Thread.java:1096)

Remember, the problem here is I am trapping the exception, but the code still works, I can see the server receives the command, and I even get a response back from the server.

I did some wireshark sniffing, and a good session and bad session look almost identical, with the exception being the amount of time it takes for the final response to get back to the phone. Since the exception is actually a SocketTimeoutException, I suppose this makes sense, but the reality is that the response does make it back and the phone accepts it as part of the same session, so what is really happening? Was there an exception or not?

Here's the wireshark capture (sorry for the left-right scrolling) The first capture is the bad session and the second one is the good session.

      IOException                                                                                                                                                           x     Good                              
1     http-alt     0             70.165.69.220     192.168.1.110     TCP     66     20180 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1                 x     31     http-alt     0            70.165.69.220     192.168.1.110     TCP     66     52220 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
2     20180        0.000039      192.168.1.110     70.165.69.220     TCP     66     http-alt > 20180 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1      x     32     52220        0.000043     192.168.1.110     70.165.69.220     TCP     66     http-alt > 52220 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
3     http-alt     0.05784       70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0                                      x     33     http-alt     0.22131      70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0
4     http-alt     0.153949      70.165.69.220     192.168.1.110     HTTP   196     GET /ph-cgi/clogin HTTP/1.1                                                             x     34     http-alt     0.350917     70.165.69.220     192.168.1.110     HTTP   196     GET /ph-cgi/clogin HTTP/1.1 
5     20180        0.161902      192.168.1.110     70.165.69.220     HTTP  2967     HTTP/1.0 200 OK  (text/html)                                                            x     35     52220        0.3841       192.168.1.110     70.165.69.220     HTTP  2967     HTTP/1.0 200 OK  (text/html)
6     20180        0.161992      192.168.1.110     70.165.69.220     TCP     54     http-alt > 20180 [FIN, ACK] Seq=2914 Ack=143 Win=65536 Len=0                            x     36     52220        0.38419      192.168.1.110     70.165.69.220     TCP     54     http-alt > 52220 [FIN, ACK] Seq=2914 Ack=143 Win=65536 Len=0
7     http-alt     0.209671      70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [ACK] Seq=143 Ack=1461 Win=65536 Len=0                                 x     37     http-alt     0.614323     70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [ACK] Seq=143 Ack=1461 Win=65536 Len=0
8     http-alt     0.253024      70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [ACK] Seq=143 Ack=2915 Win=64000 Len=0                                 x     38     http-alt     0.614456     70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [ACK] Seq=143 Ack=2915 Win=64000 Len=0
9     http-alt     0.373148      70.165.69.220     192.168.1.110     TCP     60     20180 > http-alt [FIN, ACK] Seq=143 Ack=2915 Win=64000 Len=0                            x     39     http-alt     0.746923     70.165.69.220     192.168.1.110     TCP     60     52220 > http-alt [FIN, ACK] Seq=143 Ack=2915 Win=64000 Len=0
10    20180        0.373172      192.168.1.110     70.165.69.220     TCP     54     http-alt > 20180 [ACK] Seq=2915 Ack=144 Win=65536 Len=0                                 x     40     52220        0.746944     192.168.1.110     70.165.69.220     TCP     54     http-alt > 52220 [ACK] Seq=2915 Ack=144 Win=65536 Len=0
11    http-alt     0.38402       70.165.69.220     192.168.1.110     TCP     66     53091 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1                 x     41     http-alt     0.762482     70.165.69.220     192.168.1.110     TCP     66     64314 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
12    53091        0.384069      192.168.1.110     70.165.69.220     TCP     66     http-alt > 53091 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1      x     42     64314        0.762517     192.168.1.110     70.165.69.220     TCP     66     http-alt > 64314 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
13    http-alt     0.425956      70.165.69.220     192.168.1.110     TCP     60     53091 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0                                      x     43     http-alt     1.015043     70.165.69.220     192.168.1.110     TCP     60     64314 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0
14    http-alt     0.511349      70.165.69.220     192.168.1.110     TCP    349     [TCP segment of a reassembled PDU]                                                      x     44     http-alt     1.064351     70.165.69.220     192.168.1.110     TCP    349     [TCP segment of a reassembled PDU]
15    53091        0.704456      192.168.1.110     70.165.69.220     TCP     54     http-alt > 53091 [ACK] Seq=1 Ack=296 Win=65536 Len=0                                    x     45     64314        1.263922     192.168.1.110     70.165.69.220     TCP     54     http-alt > 64314 [ACK] Seq=1 Ack=296 Win=65536 Len=0
16    http-alt     2.562688      70.165.69.220     192.168.1.110     HTTP    99     POST /ph-cgi/cauth HTTP/1.1  (application/x-www-form-urlencoded)                        x     46     http-alt     3.088689     70.165.69.220     192.168.1.110     HTTP    99     POST /ph-cgi/cauth HTTP/1.1  (application/x-www-form-urlencoded)
17    53091        2.567888      192.168.1.110     70.165.69.220     HTTP   355     HTTP/1.0 200 OK  (text/html)                                                            x     47     64314        3.093318     192.168.1.110     70.165.69.220     HTTP   355     HTTP/1.0 200 OK  (text/html)
18    53091        2.568447      192.168.1.110     70.165.69.220     TCP     54     http-alt > 53091 [FIN, ACK] Seq=302 Ack=341 Win=65536 Len=0                             x     48     64314        3.093858     192.168.1.110     70.165.69.220     TCP     54     http-alt > 64314 [FIN, ACK] Seq=302 Ack=341 Win=65536 Len=0
19    http-alt     2.612071      70.165.69.220     192.168.1.110     TCP     60     53091 > http-alt [ACK] Seq=341 Ack=303 Win=65280 Len=0                                  x     49     http-alt     3.313276     70.165.69.220     192.168.1.110     TCP     60     64314 > http-alt [ACK] Seq=341 Ack=303 Win=65280 Len=0
20    http-alt     2.665338      70.165.69.220     192.168.1.110     TCP     66     34654 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1                 x     50     http-alt     3.410808     70.165.69.220     192.168.1.110     TCP     66     33703 > http-alt [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
21    34654        2.665385      192.168.1.110     70.165.69.220     TCP     66     http-alt > 34654 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1      x     51     33703        3.410851     192.168.1.110     70.165.69.220     TCP     66     http-alt > 33703 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
22    http-alt     2.665487      70.165.69.220     192.168.1.110     TCP     60     53091 > http-alt [FIN, ACK] Seq=341 Ack=303 Win=65280 Len=0                             x     52     http-alt     3.41086      70.165.69.220     192.168.1.110     TCP     60     64314 > http-alt [FIN, ACK] Seq=341 Ack=303 Win=65280 Len=0
23    53091        2.6655        192.168.1.110     70.165.69.220     TCP     54     http-alt > 53091 [ACK] Seq=303 Ack=342 Win=65536 Len=0                                  x     53     64314        3.41087      192.168.1.110     70.165.69.220     TCP     54     http-alt > 64314 [ACK] Seq=303 Ack=342 Win=65536 Len=0
24    http-alt     2.709857      70.165.69.220     192.168.1.110     TCP     60     34654 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0                                      x     54     http-alt     3.715974     70.165.69.220     192.168.1.110     TCP     60     33703 > http-alt [ACK] Seq=1 Ack=1 Win=65536 Len=0
25    http-alt     2.916243      70.165.69.220     192.168.1.110     HTTP   308     GET /ph-cgi/eval?formula=ph_macro%28%27TESTING%27%29 HTTP/1.1                           x     55     http-alt     3.830971     70.165.69.220     192.168.1.110     HTTP   308     GET /ph-cgi/eval?formula=ph_macro%28%27TESTING%27%29 HTTP/1.1 
26    34654        3.114457      192.168.1.110     70.165.69.220     TCP     54     http-alt > 34654 [ACK] Seq=1 Ack=255 Win=65536 Len=0                                    x     56     33703        3.858623     192.168.1.110     70.165.69.220     HTTP   153     HTTP/1.0 200 OK  (text/html)
27    http-alt     11.023287     70.165.69.220     192.168.1.110     TCP     60     34654 > http-alt [FIN, ACK] Seq=255 Ack=1 Win=65536 Len=0                               x     57     33703        3.858729     192.168.1.110     70.165.69.220     TCP     54     http-alt > 33703 [FIN, ACK] Seq=100 Ack=255 Win=65536 Len=0
28    34654        11.023305     192.168.1.110     70.165.69.220     TCP     54     http-alt > 34654 [ACK] Seq=1 Ack=256 Win=65536 Len=0                                    x     58     http-alt     4.114668     70.165.69.220     192.168.1.110     TCP     60     33703 > http-alt [ACK] Seq=255 Ack=101 Win=65536 Len=0
29    34654        34.882577     192.168.1.110     70.165.69.220     TCP     54     http-alt > 34654 [FIN, ACK] Seq=1 Ack=256 Win=65536 Len=0                               x     59     http-alt     4.153392     70.165.69.220     192.168.1.110     TCP     60     33703 > http-alt [FIN, ACK] Seq=255 Ack=101 Win=65536 Len=0
30    http-alt     34.926041     70.165.69.220     192.168.1.110     TCP     60     34654 > http-alt [ACK] Seq=256 Ack=2 Win=65536 Len=0                                    x     60     33703        4.153402     192.168.1.110     70.165.69.220     TCP     54     http-alt > 33703 [ACK] Seq=101 Ack=256 Win=65536 Len=0

So, perhaps I should just ignore a SocketTimeoutException??? Sounds kind of dangerous....

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断念 2025-01-10 11:02:04

我认为问题在于您在这一行中的套接字超时：

HttpConnectionParams.setSoTimeout(httpParams, 5000);

如果我们查看 HttpClient 文档的这一部分：

例如，HTTP 服务器如果成功接收到，就会认为它的合同部分已经履行并处理请求，生成响应并将状态代码发送回客户端。如果客户端由于读取超时、请求取消或系统崩溃而未能收到完整的响应，服务器将不会尝试回滚事务。如果客户端决定重试同一请求，服务器将不可避免地多次执行同一事务。在某些情况下，这可能会导致应用程序数据损坏或应用程序状态不一致。

服务器正在接收请求并发送响应的事实可能如文档所描述的那样。解决方案是增加 SoTimeout 或重试您的请求：

HttpRequestRetryHandler retryHandler = new HttpRequestRetryHandler(){
        @Override
        public boolean retryRequest(IOException exception,
                int executionCount, HttpContext context) {

            if (executionCount >= 5) {
                Log.e("Retry Limit", "Retry #: " + executionCount);
                return false;
            }

            if(exception instanceof java.net.SocketTimeoutException){
                Log.e("(SocketTimeoutException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof java.net.SocketException){
                Log.e("(SocketException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof ObjectStreamException){
                Log.e("(ObjectStreamException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof ProtocolException){
                Log.e("(ProtocolException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof SSLException){
                Log.e("(SSLException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof SyncFailedException){
                Log.e("(SyncFailedException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof UTFDataFormatException){
                Log.e("(UTFDataFormatException)", "Retry #: " + executionCount);
                return true;
            }
            return false;
        }
    };
    client.setHttpRequestRetryHandler(retryHandler);

这将捕获 SocketTimeOut、SocketException 等。但是，如果您收到 IOException可以手动重试请求：

catch (IOException e)
{
    SystemClock.sleep(1500);
       Log.e(MY_ERROR_TAG, "IOException: " + e.getMessage());
     Toast.ShowToast("Error connecting to server.", pa);
    /*RETRY THE REQUEST MANUALLY*/
}

I think the problem is in the socket time out you have in this line :

HttpConnectionParams.setSoTimeout(httpParams, 5000);

If we look to this part of the HttpClient Documentation: http://hc.apache.org/httpclient-legacy/exception-handling.html

For instance, the HTTP server will consider its part of the contract fulfilled if it succeeds in receiving and processing the request, generating a response and sending a status code back to the client. The server will make no attempts to roll back the transaction if the client fails to receive the response in its entirety due to a read timeout, a request cancellation or a system crash. If the client decides to retry the same request, the server will inevitably end up executing the same transaction more than once. In some cases this may lead to application data corruption or inconsistent application state.

The fact that the server is receiving the request and sending a response could be what the documentation is describing. The solution would be to increase the SoTimeout or retry your request:

HttpRequestRetryHandler retryHandler = new HttpRequestRetryHandler(){
        @Override
        public boolean retryRequest(IOException exception,
                int executionCount, HttpContext context) {

            if (executionCount >= 5) {
                Log.e("Retry Limit", "Retry #: " + executionCount);
                return false;
            }

            if(exception instanceof java.net.SocketTimeoutException){
                Log.e("(SocketTimeoutException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof java.net.SocketException){
                Log.e("(SocketException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof ObjectStreamException){
                Log.e("(ObjectStreamException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof ProtocolException){
                Log.e("(ProtocolException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof SSLException){
                Log.e("(SSLException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof SyncFailedException){
                Log.e("(SyncFailedException)", "Retry #: " + executionCount);
                return true;
            }
            if(exception instanceof UTFDataFormatException){
                Log.e("(UTFDataFormatException)", "Retry #: " + executionCount);
                return true;
            }
            return false;
        }
    };
    client.setHttpRequestRetryHandler(retryHandler);

This will catch the SocketTimeOut,SocketException etc. But if you get a IOException you could retry the request manually:

catch (IOException e)
{
    SystemClock.sleep(1500);
       Log.e(MY_ERROR_TAG, "IOException: " + e.getMessage());
     Toast.ShowToast("Error connecting to server.", pa);
    /*RETRY THE REQUEST MANUALLY*/
}

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