Good stuff.

I do a good bit of scraping, and made RubyRetriever[1] to make my life easier but it seems like I'm getting roadblocked on occasion, probably due to some of the things you mention in your article.

Is there any way for a site to verify that only their JS and CSS files are linked? Like preventing injection?

[1]: https://github.com/joenorton/rubyretriever