I ran into this same issue a few days ago, and I found that for iOS you should use the ionic native http plugin, since using the angular http plugin has issues with the WKWebview plugin. The link for my solution is below.
I ran into this same issue a few days ago, and I found that for iOS you should use the ionic native http plugin, since using the angular http plugin has issues with the WKWebview plugin. The link for my solution is below.