问题
This problem appeared when I update the ionic and cordova, $http can't normally work any more, always return null. in debug line apeared "04-28 16:06:29.756: W/SystemWebViewClient(16778): URL blocked by whitelist:"
回答1:
This error happened after cordova update 5.0.0.
Like Santosh said, you just need add the plugin https://github.com/apache/cordova-plugin-whitelist.git to your app and everything will work. I was getting the same error and i fixed with this plugin.
You will need add the follow code to your webconfig file:
<allow-navigation href="http://yourDomain.com/*" />
回答2:
With the updated version of cordova-android, you now need to include the cordova-whitelist-plugin.
https://github.com/apache/cordova-mobile-spec/tree/master/cordova-plugin-whitelist
Try adding that to your project
For example -
cordova plugin add https://github.com/apache/cordova-plugin-whitelist.git
For more help read issue on https://github.com/driftyco/ionic/issues/3597
回答3:
Use this command with new CLI:
ionic cordova plugin add cordova-plugin-whitelist
And in the config.xml no need to change the default settings which are:
<allow-intent href="http://*/*" />
<allow-intent href="https://*/*" />
<allow-intent href="tel:*" />
<allow-intent href="sms:*" />
<allow-intent href="mailto:*" />
<allow-intent href="geo:*" />
Here * represents anything so I solved my CORS problem using these settings.
Note:Don't forget to remove the platform after adding the plugin although it's added automatically there too but it's better to take precaution as you'll never know what might be the cause using
ionic cordova plugin save
ionic cordova platform remove android
ionic cordova platform remove ios
Then add again
ionic cordova platform add android
ionic cordova platform add ios
来源：https://stackoverflow.com/questions/29913871/04-28-160629-756-w-systemwebviewclient16778-url-blocked-by-whitelist