我用okhttp（2.5.0）创建了大约40个请求，每45秒一次访问互联网（仅用于测试）。手机正常工作时一切正常，但如果手机处于待机状态，则会发生以下异常，
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: java.net.ConnectException: failed to connect to api.thinkpage.cn/115.29.232.24 (port 443) after 10000ms: isConnected failed: ECONNREFUSED (Connection refused)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at libcore.io.IoBridge.isConnected(IoBridge.java:238)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at libcore.io.IoBridge.connectErrno(IoBridge.java:171)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:122)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at java.net.Socket.connect(Socket.java:882)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.internal.Platform$Android.connectSocket(Platform.java:190)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Connection.connectSocket(Connection.java:196)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Connection.connect(Connection.java:172)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Connection.connectAndSetOwner(Connection.java:367)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:128)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:328)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:245)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Call.getResponse(Call.java:267)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:224)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:195)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Call.access$100(Call.java:34)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.Call$AsyncCall.execute(Call.java:162)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at com.squareup.okhttp.internal.NamedRunnable.run(NamedRunnable.java:33)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at java.lang.Thread.run(Thread.java:818)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: Caused by: android.system.ErrnoException: isConnected failed: ECONNREFUSED (Connection refused)
10-29 01:31:46.563 15846-22190/com.example.weathertrack W/System.err: at libcore.io.IoBridge.isConnected(IoBridge.java:223)
我测试了好几次，我发现如果我的应用程序在前台，那么40个请求在每一轮都能正常工作;即使我的应用程序是在背景中，但只要手机没有处于待机状态，它似乎也工作正常。但是，几次成功访问后，ConnectException就会发生。在这些测试过程中，我将okhttpclient的最大并发数设置为1。
我在这里也发现了一个老问题。
Creating new socket after closing an old one causes connection refused
Android系统是否在一个处于待机状态的应用程序中同时限制网络访问？
ADD1
现在，我基本可以肯定这个问题是由miui rom造成的。其他人用其他rom测试了它，这样的问题从未发生过。 似乎我应该向谷歌工程师道歉，因为他们错误地指责他们。