adds Set-Cookie method to the HTTP transport.

[tonybase]

cookie := http.Cookie{
        Name:     "exampleCookie",
        Value:    "Hello world!",
        Path:     "/",
        MaxAge:   3600,
        HttpOnly: true,
        Secure:   true,
        SameSite: http.SameSiteLaxMode,
    }
 // Use the http.SetCookie() function to send the cookie to the client.
http.SetCookie(ctx, cookie)