HTTP 400 · Bad Request
HTTP 400 Folders / Filters

When & why it happens

The specified filter cannot be used in this context. Treated by gogram as a regular API error; inspect ErrResponseCode.Message for the exact code.

Handling in gogram

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

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