URL rewrite in IIS after checking user agent.

I was creating an AngularJS application for a client when I hit a roadblock. The project needed the ability to support facebook Open Graph properties, pinterest rich pins, stumble upon links, google plus links. All the above were failing.

All the above mentioned crawlers do not execute javascript. So I was stuck between a rock and a hard place. :(. So the soution I designed was to do a url rewrite for all the requests coming from the above said crawlers to a page generated using PhantomJS. Simple right? not quite. Since I already had html5 type url rewrites set up etc it was pretty cumbersome to write all the URL rewrite logic for IIS. At one point I was not sure how the user agent strings actually looked like. So born was this project.

This project is going to help me understand the user agent string that is used by the above mentioned crawlers and how to do url the rewrites for them.

I have done a URL rewrite for the above mentioned crawlers and have supported and tested the following rich object and schema handling platforms

http://schema.org/ http://ogp.me/ [facebook] https://developers.pinterest.com/docs/rich-pins/overview/ [pinterest]