1. org.apache.http.conn.HttpHostConnectException: Connection to refused

权限问题:

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

2. 浏览器直接输入url可以get，http get失败

在Activity(调用HttpClient处)，也可能是Fragment，中添加

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();StrictMode.setThreadPolicy(policy);

详情可参考

http://stackoverflow.com/questions/14399892/android-cant-execute-http-get-or-post-request