HTTP 400 · Bad Request
HTTP 400 Other

When & why it happens

The supplied md5 checksum 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 == "MD5_CHECKSUM_INVALID" { // handle this error } }