How to call backend service to login

I am going to develop login App with some server side data bindings, For this i am going to call http service to my local server Http://localhost:11001,
I am very new to ionic and i don’t know hot to call Api’s
Please any one can help me to solve this.

This might help you. You might need to do some adjustments because it’s old but it works.

http://blog.ionic.io/10-minutes-with-ionic-2-calling-an-api/amp/?client=safari