In gorilla/sessions, func NewCookieStore(keyPairs ...[]byte) *CookieStore is a used to create a new CookieStore. But I don't actually know what is a secret key (or an authentication key).
The description had said that :
It is recommended to use an authentication key with 32 or 64 bytes.
Therefore, is this means that I can randomly push any string with length of 32 or 64? How do you choose your authentication key?
From the end of that paragraph in the documentation for NewCookieStore:
Use the convenience function securecookie.GenerateRandomKey() to create strong keys.