callback works if a request end with error

[achillesss]

NewRequest().End(callbackFun)

if an error occurs in a request, the func will return without calling the callback function in which i could have handled the error:

for {
 		resp, body, errs = s.getResponseBytes()
 		if errs != nil {
                         // here returns
			return nil, nil, errs
 		}
                 ...
}

so we may change the return to break, and return the result at the bottom of the whole function like this:

func (s *SuperAgent) EndBytes(callback ...func(response Response, body []byte, errs []error)) (Response, []byte, []error) {
	var (
		errs         []error
		resp         Response
		body         []byte
		respCallback http.Response
	)

	for {
		resp, body, errs = s.getResponseBytes()
		if errs != nil {
			break
		}

		if s.isRetryableRequest(resp) {
			resp.Header.Set("Retry-Count", strconv.Itoa(s.Retryable.Attempt))
			respCallback = *resp
			break
		}
	}

	if len(callback) != 0 {
		callback[0](&respCallback, body, s.Errors)
	}
	return resp, body, nil
}