如何修改Android应用程序的HTTP请求标头？

您可以像这样轻松设置标题:

            final String USER_AGENT = "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2049.0 Safari/537.36";
            final String URL = "http://www.cnn.com";
            final String REFERER_URL = "http://www.w3.org/hypertext/DataSources/Overview.html";

            HttpClient httpclient = new DefaultHttpClient();
            HttpGet request = new HttpGet(URL);

            // add request header
            request.addHeader("User-Agent", USER_AGENT);
            request.addHeader("Referer", REFERER_URL);

            try {
                HttpResponse response = httpclient.execute(request);
            } catch (Exception e) {
                // ...
            }

我也添加了"User-Agent",因为大多数网站使用它而不是"Referer"来确定客户端是否是移动浏览器.

请注意,"Referer"拼写错误; 这是我的代码中的故意.看到这个链接.多年前猜测这是一个错字,只是卡住了.

免责声明:肮脏的黑客,只在Android 4.4上测试过,但应该适用于Android 4.0及更高版本.

需要尽早调用setupURLStreamHandlerFactory()方法,并设置我们自己的URL流处理程序工厂URL.setURLStreamHandlerFactory().工厂用于通过开通的所有连接URL.openConnection().我们为所有http:// ... URL设置了一个特殊的处理程序,它在创建的HttpUrlConnection上设置'Referer'标头.

private static String REFERER_URL = "http://www.example.com/referer";

private void setupURLStreamHandlerFactory() {
    URL.setURLStreamHandlerFactory(new URLStreamHandlerFactory() {
        @Override
        public URLStreamHandler createURLStreamHandler(String protocol) {
            if ("http".equals(protocol)) {
                try {
                    String className = Build.VERSION.SDK_INT < 19 ?  "libcore.net.http.HttpHandler" : "com.android.okhttp.HttpHandler";
                    URLStreamHandler streamHandler = (URLStreamHandler) Class
                            .forName(className).newInstance();
                    return wrap(streamHandler);
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
            return null;
        }
    });
}

private static URLStreamHandler wrap(final URLStreamHandler streamHandler) {
    return new URLStreamHandler() {
        @Override
        protected URLConnection openConnection(URL u) throws IOException {
            URLConnection conn;
            try {
                Method openConnectionMethod = URLStreamHandler.class
                        .getDeclaredMethod("openConnection", URL.class);
                openConnectionMethod.setAccessible(true);
                conn = (URLConnection) openConnectionMethod.invoke(
                        streamHandler, u);
                conn.setRequestProperty("Referer", REFERER_URL);
                return conn;
            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            } catch (IllegalArgumentException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                if (e.getTargetException() instanceof IOException) {
                    throw (IOException) e.getTargetException();
                } else {
                    throw new RuntimeException(e);
                }
            }
        }
    };
}

编辑:修改为适用于Android 4.4 Kitkat之前的版本

Youtube检测用户浏览器Agent String,其中包含有关浏览器的信息.如果你是使用WebView显示的YouTube视频,而不是,那么这将是能够设置WebView的Agent String.您可以在Internet上找到不同浏览器的代理字符串.我在这里找到了一些:Agent Strings.

以下是我通过模仿Firefox浏览器播放Bob Marley的手机不允许播放的歌曲:

package com.my.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

    public class MyActivity extends Activity {

        private WebView mWebView ;

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            mWebView  = new WebView(this);
            // Enable javascript
            mWebView.getSettings().setJavaScriptEnabled(true);
            // Impersonate Mozzila browser
            mWebView.getSettings().setUserAgentString("Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:21.0.0) Gecko/20121011 Firefox/21.0.0");
            final Activity activity = this;

            mWebView.setWebViewClient(new WebViewClient() {
                public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                    Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
                }
            });

            mWebView .loadUrl("http://youtube.com/watch?v=x59kS2AOrGM");
            setContentView(mWebView);
        }

    }

编辑:

您还需要授予您的活动使用互联网的权限,方法是将此行添加到您的AndroidManifest.xml:

<uses-permission android:name="android.permission.INTERNET" />