HTTP 401 · Unauthorized
HTTP 401 Authentication

When & why it happens

The supplied access token is malformed, points to nothing the server recognises, or fails a server-side validity check.

Handling in gogram

Surfaced as *gogram.ErrResponseCode. Match on the message:

if err, ok := err.(*gogram.ErrResponseCode); ok { if err.Message == "ACCESS_TOKEN_INVALID" { // handle this error } }