Easily validating your Varnish cache VCL file and other quick tips

I’ve been playing around with varnish lately and had to make a change in a VLC file to perform URL re-writing before following with “hashing”, lookup, and if necessary forwarding to tomcat.
For anyone wanting further information on the varnish pipeline, as well as why someone should use varnish I recommend the following two articles:

1) http://open.blogs.nytimes.com/2010/09/15/using-varnish-so-news-doesnt-break-your-server/?smid=tw-share
2) https://www.varnish-software.com/static/book/VCL_Basics.html