CookieMiddleware returns a middleware that ensures each request has a valid JWT in the "ClientID" cookie.

СreateCookieClientID creates a JWT token and embeds it in an HTTP cookie.

Constant TOKENEXP is used for specifying the secret key used for signing JWT.

Constant TOKENEXP is used for specifying the token expiration time.

Claims struct includes the registered claims from jwt package and a custom UserID field.