HttpPost 不断捕获 ClientProtocolException

Question

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(myURL);
// I can't show my url but it's a verified .asp working both with iOS and browser

try {
    // Add your data                     
    String str = "param1=test&param2=test2&param3=test3";
    StringEntity strEntity = new StringEntity(str, HTTP.UTF_8);
    httppost.setEntity(strEntity);

    httppost.setHeader("Set-Cookie", sessionCookie);
    httppost.setHeader("Accept", "text/html");
    httppost.setHeader("Content-Type", "application/x-www-form-urlencoded");
    httppost.setHeader("Content-Length", strEntity.getContentLength()+""); 

    // Execute HTTP Post Request
    BasicResponseHandler brh = new BasicResponseHandler();
    String responseBody = httpclient.execute(httppost, brh);
    System.out.println(responseBody);
} catch (ClientProtocolException e) {
    // I keep catching this exception
    e.printStackTrace();
} catch (IOException e) {
    System.err.println("Check network");
}

我不知道我做错了什么，但是当它在浏览器中和我的 iPhone 版本的应用程序中一切正常时，我无法让它工作。

所以有什么想法吗？感谢您的帮助。

这是错误的整个堆栈跟踪：

11-18 20:31:55.433：W/System.err(1479)： org.apache.http.client.ClientProtocolException 11-18 20:31:55.437: W / System.err（1479）：在 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:557) 11-18 20:31:55.437: W/System.err(1479): 在 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653) 11-18 20:31:55.437: W/System.err(1479): 在 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627) 11-18 20:31:55.437: W/System.err(1479): 在 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616) 11-18 20:31:55.437: W/System.err(1479): 在 com.example.testserverec.MainActivity$SendDataToECTask.doInBackground(MainActivity.java:97) 11-18 20:31:55.437: W/System.err(1479): 在 com.example.testserverec.MainActivity$SendDataToECTask.doInBackground(MainActivity.java:1) 11-18 20:31:55.437: W/System.err(1479): 在 android.os.AsyncTask$2.call(AsyncTask.java:287) 11-18 20:31:55.437: W / System.err（1479）：在 java.util.concurrent.FutureTask.run(FutureTask.java:234) 11-18 20：31：55.437：W/System.err（1479）：在 android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 11-18 20：31：55.437：W/System.err（1479）：在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 11-18 20:31:55.437: W/System.err(1479): 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 11-18 20:31:55.437: W/System.err(1479): 在 java.lang.Thread.run(Thread.java:856) 11-18 20:31:55.437: W/System.err(1479)：引起：org.apache.http.ProtocolException： Content-Length 标头已经存在 11-18 20:31:55.437: W / System.err（1479）：在 org.apache.http.protocol.RequestContent.process(RequestContent.java:70) 11-18 20:31:55.437: W/System.err(1479): 在 org.apache.http.protocol.BasicHttpProcessor.process(BasicHttpProcessor.java:290) 11-18 20:31:55.437: W/System.err(1479): 在 org.apache.http.protocol.HttpRequestExecutor.preProcess(HttpRequestExecutor.java:160) 11-18 20:31:55.437: W/System.err(1479): 在 org.apache.http.impl.client.DefaultRequestDirector.execute（DefaultRequestDirector.java:408） 11-18 20:31:55.437: W/System.err(1479): 在 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 11-18 20:31:55.437: W/System.err(1479): ... 11 更多

Answer 1

所以帮助我解决问题的是这一行：

W/System.err(1479)：原因：org.apache.http.ProtocolException：Content-Length 标头已经存在 11-18 20:31:55.437:

只需要删除：

httppost.setHeader("Content-Length", strEntity.getContentLength()+"");

现在我可以将我的请求发送到服务器了。

Answer 2

这应该可以工作

HttpParams httpParams=new BasicHttpParams();
HttpClient httpclient = new DefaultHttpClient(httpParams);
HttpPost httppost = new HttpPost(myURL);
// I can't show my url but it's a verified .asp working both with iOS and browser

try {
// Add your data                     
String str = "param1=test&param2=test2&param3=test3";
StringEntity strEntity = new StringEntity(str, HTTP.UTF_8);
httppost.setEntity(strEntity);

httppost.setHeader("Set-Cookie", sessionCookie);
httppost.setHeader("Accept", "text/html");
httppost.setHeader("Content-Type", "application/x-www-form-urlencoded");
httppost.setHeader("Content-Length", strEntity.getContentLength()+""); 

// Execute HTTP Post Request
BasicResponseHandler brh = new BasicResponseHandler();
String responseBody = httpclient.execute(httppost, brh);
System.out.println(responseBody);
} catch (ClientProtocolException e) {
// I keep catching this exception
e.printStackTrace();
} catch (IOException e) {
System.err.println("Check network");
}