// Callback is a callback handler.
// It does HTTP request if it's needed.
func Callback(ctx context.Context, cu *trim.CustomURL) error {
req, err := cu.Callback()
if err != nil {
// empty callback
if err == trim.ErrEmptyCallback {
return nil
}
return err
}
req.Header = http.Header{"User-Agent": {httpUserAgent}}
timeoutTLS, timeout := 5*time.Second, 7*time.Second
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{Timeout: timeout}).Dial,
TLSHandshakeTimeout: timeoutTLS,
// TLSClientConfig: &tls.Config{InsecureSkipVerify: false},
}
client := &http.Client{Transport: tr, Timeout: timeout}
resp, err := client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
_, err = ioutil.ReadAll(resp.Body)
return err
}
