Http calls failing in IOS device but Works in Android?

I have developed my ionic app in android and IOS It is working fine for android.but for ios I am getting issue in the Http Calls fails and throw error with null in the http call error faing this issue in ios device?

Have you applied the ios9 ionic patches, especially the one for the transport protocol / app transport security

I have simualte it in ios 6 .it was not working for me

I had a same problem too. Removing the WkWebView solves the issue.

ionic cordova plugin remove cordova-plugin-wkwebview-engine

More info:

After this plugin is removed I can make http request via iOS!