How to get response with JWT in Golang - go

Question

I'm trying get the response from an API that uses JSON Web token, I need use the header : {
Authorization: "Bearer token"
}
But I would like to keep the timeout of the http.Client that I'm using. How could I do it?
var myClient = &http.Client{Timeout: 10 * time.Second}
func getJson(url string, target interface{}) error {
r, err := myClient.Get(url)
if err != nil {
return err
}
defer r.Body.Close()
return json.NewDecoder(r.Body).Decode(target)
}

Answer 1

net/http.Request has a Header field that you can directly edit, but this means you can't use the shortcut client.Get method. Something more like:
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return err
}
req.Header = map[string][]string{
"Authorization": {fmt.Sprintf("Bearer %s", jwt)},
}
r, err := myClient.Do(req)
...

Answer 2

You could do something like this,
func getJson(url string, target interface{}) error {
req, err := http.NewRequest(http.MethodGet, url, nil)
if nil != err {
return err
}
r, err := myClient.Do(req)
if err != nil {
return err
}
defer r.Body.Close()
return json.NewDecoder(r.Body).Decode(target)
}
Alternatively , you could also use context to control the request timeout
func getJsonWithContext(url string, target interface{}) error {
req, err := http.NewRequest(http.MethodGet, url, nil)
if nil != err {
return err
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second*1)
defer cancel()
reqWithContext := req.WithContext(ctx)
r, err := myClient.Do(reqWithContext)
if err != nil {
return err
}
defer r.Body.Close()
return json.NewDecoder(r.Body).Decode(target)
}