Unexpected Output

[goodday451999]

Describe the Bug
For the input link(original link) https://www.facebook.com, the application is providing https//outbound-js.herokuapp.com/90663 as the output link(middleman).
According to your code, the output is correct because you've just appended the host-URL with the mainkey value. But it can be the middleman-link for that particular input-link.

Expected Behaviour
According to the concepts of "middleman" instead of that link, https://lm.facebook.com should be the output link.