client - > POST authenticate with username and password -> server validate the username and password , generate JWT using the secret key
server-------> return the generated JWT
client--------------> GET /hello with JWT in the Header, server validate the JWT
client - > POST authenticate with username and password -> server validate the username and password , generate JWT using the secret key server-------> return the generated JWT client--------------> GET /hello with JWT in the Header, server validate the JWT
server -------------> return the response