andriod webview访问当地服务器提示找不到网页

andriod webview访问本地服务器提示找不到网页？
我在本写了个服务器，现在想通过andriod的webview访问，但是提示找不到网页

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mWebView = (WebView) findViewById(R.id.webView1); 
        
        WebSettings webSettings = mWebView.getSettings();   
        webSettings.setSavePassword(false);   
        webSettings.setSaveFormData(false);   
        webSettings.setJavaScriptEnabled(true);   
        webSettings.setSupportZoom(false);   

        mWebView.loadUrl("http://127.0.0.1:81/");

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.test_activitiy_onresure"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />



    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".Main"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>