Native HTTP Plugin blocking Angular HTTP

I am using Native HTTP for post request.

Reason for using Native HTTP : iOS not working for Post request if I am using Angular HTTP client.

Problem: My problem is I used Native and Angular HTTP client both in project but when I am trying to do request with Angular HTTP get and post then that request not fired.

can somebody clear me this

1.Why POST request not working for ios when we are using Angular HTTP
2.Is this resolved in latest versions of Ionic
3.Should I use only one HTTP either Native or Angular?