org.apache.http.ProtocolException：无效标头：<?xml version="1.0" encoding="UTF-8"?>答案

【问题标题】：org.apache.http.ProtocolException: Invalid header: <?xml version="1.0" encoding="UTF-8"?>org.apache.http.ProtocolException：无效标头：<?xml version="1.0" encoding="UTF-8"?>
【发布时间】：2015-03-21 23:17:40
【问题描述】：

很久以来，我一直被这个问题困扰，从我的 androidApp HTTP 习惯了我的 Cable Modem HTTP 服务器，但在客户端使用 linux mini_httpd 我我很快就会收到这个 org.apache.http.client.ClientProtocolException

httpClient.execute(httpget);

我在这里发布这个问题之前做了很多研究，在我没有将 contentType 设置为 xml 但我正在这样做之前

httpget.setHeader("Content-Type", "application/xml"); but still struggling with same error.

详细代码如下

HttpParams httpParameters = new BasicHttpParams();
int timeoutConnection = 10000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
int timeoutSocket = 25000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

   HttpGet httpget = new HttpGet(URL);          

   httpget.setHeader("Content-Type", "application/xml");
   httpget.addHeader("Accept", "text/xml");
   httpget.setParams(httpParameters);

   HttpClient httpClient = new DefaultHttpClient();
   HttpResponse response = null;
   try {
       response = httpClient.execute(httpget);
       StatusLine statusLine = response.getStatusLine();
       if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
           Log.d("Http response", "response string got");

           /* parse the response received from server */
           try {
               cmInfo = xmlParser.parse(response.getEntity().getContent());
               Log.d("Http Response","back in main");
           } catch (XmlPullParserException e1) {
               Log.d("parse:", "XmlPullParserException");
               e1.printStackTrace();
           } catch (IOException e1) {
               Log.d("parse:", "IOException");
               e1.printStackTrace();
           }
    }
   } catch (ClientProtocolException e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(), errMsg2, Toast.LENGTH_LONG).show();
    } catch (IOException e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(), errMsg1, Toast.LENGTH_LONG).show();
    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(), "Connection Refused from server or Connection Timeout", Toast.LENGTH_LONG).show();
    }

请提出要做什么或有任何解决方法。

这里是日志猫

03-18 18:41:08.246: D/getWifiDetails: cmURL:(32090): http://192.168.0.1:50010?
03-18 18:41:08.246: D/WizardYourWifiActivity: URL-(32090): http://192.168.0.1:50010?get_data=PARM_WIFI_SSIDNAME_2_4G,PARM_WIFI_SSIDNAME_5G,PARM_WIFI_SECURITYMODE_2_4G,PARM_WIFI_SECURITYMODE_5G,PARM_WIFI_PASSPHRASE_2_4G,PARM_WIFI_PASSPHRASE_5G,PARM_WIFI_MODE_2_4G,PARM_WIFI_MODE_5G,PARM_WIFI_POWER_2_4G,PARM_WIFI_POWER_5G,PARM_WIFI_CHANNEL_2_4G,PARM_WIFI_CHANNEL_5G,PARM_WIFI_GUEST_NW_EN_2_4G,PARM_WIFI_GUEST_NW_EN_5G
03-18 18:41:08.707: W/System.err(32090): org.apache.http.client.ClientProtocolException
03-18 18:41:08.713: W/System.err(32090):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:557)
03-18 18:41:08.713: W/System.err(32090):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
03-18 18:41:08.713: W/System.err(32090):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
03-18 18:41:08.713: W/System.err(32090):    at com.arrisi.selfinstall.wizard.WizardYourWifiActivity.doCustomCreate(WizardYourWifiActivity.java:98)
03-18 18:41:08.713: W/System.err(32090):    at com.arrisi.selfinstall.wizard.BaseWizardActivity.onCreate(BaseWizardActivity.java:44)
03-18 18:41:08.713: W/System.err(32090):    at android.app.Activity.performCreate(Activity.java:5933)
03-18 18:41:08.713: W/System.err(32090):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
03-18 18:41:08.713: W/System.err(32090):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
03-18 18:41:08.713: W/System.err(32090):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
03-18 18:41:08.713: W/System.err(32090):    at android.app.ActivityThread.access$800(ActivityThread.java:144)
03-18 18:41:08.714: W/System.err(32090):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
03-18 18:41:08.714: W/System.err(32090):    at android.os.Handler.dispatchMessage(Handler.java:102)
03-18 18:41:08.714: W/System.err(32090):    at android.os.Looper.loop(Looper.java:135)
03-18 18:41:08.714: W/System.err(32090):    at android.app.ActivityThread.main(ActivityThread.java:5221)
03-18 18:41:08.714: W/System.err(32090):    at java.lang.reflect.Method.invoke(Native Method)
03-18 18:41:08.714: W/System.err(32090):    at java.lang.reflect.Method.invoke(Method.java:372)
03-18 18:41:08.714: W/System.err(32090):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-18 18:41:08.714: W/System.err(32090):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-18 18:41:08.714: W/System.err(32090): Caused by: org.apache.http.ProtocolException: Invalid header: <?xml version="1.0" encoding="UTF-8"?>
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.impl.io.AbstractMessageParser.parseHeaders(AbstractMessageParser.java:162)
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:178)
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:180)
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:235)
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:259)
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:279)
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:121)
03-18 18:41:08.714: W/System.err(32090):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:428)
03-18 18:41:08.715: W/System.err(32090):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
03-18 18:41:08.715: W/System.err(32090):    ... 17 more

【问题讨论】：

问题不在客户端，服务器返回的响应头不正确，您应该跟踪原始服务器响应。无论如何，如果您想使用 Apache Http 组件发出一个没有意义的简单请求，请使用 Android 的默认 HttpURLConnection。
@vzamanillo 我已经用服务器的响应编辑了我的问题。服务器实际上是按照预期使用正确的消息进行响应，但是在客户端代码中它正在抛出 ClientProtocolException
检查此stackoverflow.com/questions/12684739，跟踪服务器响应以查看服务器返回的 http 标头，这不是您的客户端故障，而是客户端警告您该错误。
是的，响应结构似乎有问题

标签： java android xml

【解决方案1】：

怀疑这个问题是由于服务器响应不正确造成的。基本上

httpget.setHeader("Content-Type", "application/xml");

实际上在我的 http 客户端产生问题的服务器没有设置它。我按照其他 stackOverFlow 答案中的建议使用 HttpURLConnection 代替 appache.http ，但这实际上并没有解决问题，但它帮助我缩小了问题范围。

感谢@vzamanillo 的帮助

【讨论】：