Could we get a third opinion about the original text? If this guide is targetting newbs, then I can say with authority that it made no sense to me. My colleague, who is a lot more familiar with rails (and is a contributor as well) could not explain it to me either, which is what sent me hunting for better explanations. 

As to your issue with the word "redirect", I copy here the first line of the nginx link that you gave me.
`X-accel allows for internal redirection to a location determined.....`

Personally I believe the page I linked is superior in terms of content. It explains in greater detail about the motivation itself, while the apache/nginx links are more about how to use it. 

I can try to rewrite it again i guess, without the link to the Yii page, if that is a strict no