The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.

Flutter 使用 webview 访问 “http://localhost:8080"时报错，此错误应为 iOS11 禁止本地http的访问。

解决方法：
在 `ios/Runner/Info.plist' 文件中添加

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true />
    <key>NSAllowsLocalNetworking</key>
    <true />
    <key>NSExceptionDomains</key>
    <dict>
        <key>localhost</key>
        <dict>
            <key>NSExceptionAllowsInsecureHTTPLoads</key>
            <true />
            <key>NSExceptionRequiresForwardSecrecy</key>
            <false />
            <key>NSIncludesSubdomains</key>
            <true />
            <!-- Optional: Specify minimum TLS version -->
            <key>NSTemporaryExceptionMinimumTLSVersion</key>
            <string>TLSv1.1</string>
            <key>NSRequiresCertificateTransparency</key>
            <false />
        </dict>
    </dict>
</dict>

需要注意的是：此段代码必须放在 plist 里面。

<plist version="1.0">
	<dict>
            <!-- 上面那段代码放这 -->
        </dict>
</plist>

保存好文件，执行 flutter clean ，再重新运行即可。

The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.

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