HTTP 400 · Bad Request
HTTP 400 Channels & Chats

When & why it happens

The channel id does not point to a real channel — usually a stale or malformed InputChannel.

Handling in gogram

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

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