help (get http)

[GlauberF]

Hello,
if instead of passing the fixed input values (
user: {
           firstName: 'Ryan'
           lastName: 'Chenkie'
           email: 'ryanchenkie@gmail.com'
           image: 'https://1.gravatar.com/avatar/7f4ec37467f2f7db6fffc7b4d2cc8dc2?s=250'
         }).
I want to order via http, how would I do?
example: (this http.get $ (. 'http: //') .then ((response) => {this.user response.json = ()})