Your English is a bit stilted in places - "Just check that the distance from A-B and B-A are not equal because it is the distance related to road.".
And I'm getting Application Errors too.
And I'm getting Application Errors too.
>The shortest Distance is paris to london to paris accounting upto 0 kilometers.
You've got a bug somewhere.
Ya I know that, sometimes it comes but please refresh the app and try again. If you are getting then download the npm package and set it on your localhost.
Everything is working fine in localhost but when I upload my code to the server like appfog or heroku then these weird issue comes. Visit my app on this link http://short-route-demo.ap01.aws.af.cm/