I checked our logs, and the response your are getting is "Invalid password" this is because you are passing a "user" parameter but no "password" or "token" parameter. If you want to connect to the bot as a specific user you need to pass the user password or token.
For an anonymous user just don't include a user parameter, then you will get a response.
If you set your bot to learn from "everyone" (as you bot current does) then it will learn from all users, including anonymous users. Normally this is not a good idea, as other users can teach your bot bad responses, but it depends what type of bot you want to create.