Learning Functional Programming in Go

Authorization decorator

Our first decorator is Authorization. We call the Header helper function that adds the Authorization header with the given token to each request at runtime:

func Authorization(token string) Decorator {       return Header("Authorization", token)}func Header(name, value string) Decorator {       return func(c Client) Client {              return ClientFunc(func(r *http.Request)(*http.Response, error) {                     r.Header.Add(name, value)                     return c.Do(r)              })       }}