Implementation.swift

struct service: Requester {}

func doSomething() {
        // we are going to call this test api
        let request = HTTPRequest(url: "http://ip.jsontest.com/")

        service.execute(ofType: ResponseMapper.self, request: request) { (result) in
            switch result {
              case .failure(let error):
                  print(error)
              case .success(let object):
                  print(object)
            }
        }
}
// the response type
struct ResponseMapper: Codable {
    let ip: String
}