In simple terms, authentication is the process of verifying who a user is, while authorization is the process of verifying what they have access to. >
The HTTP WWW-Authenticate , Proxy-Authenticate they are response header defines the authentication method that should be used to gain access to a resource.
The HTTP Authorization , Proxy-Authorization they are response header contains the credentials to authenticate a user agent with a server(usually).
Manually implement checks
Check that the JWT is well formed.
Token issuer