Can I run the Apache or IIS web servers “in front of” WorkRoll?
Yes. (And if you don’t understand this question, or will have WorkRoll.com host your installation, or are installing WorkRoll via the Windows installer, don’t worry about it.) You can, optionally, run any external web server in front of WorkRoll, or you can use the internal web server supplied with your application server. Given that WorkRoll installations receive relatively little traffic (even with external-feedback enabled), an external web server such as Apache or IIS is essentially never necessary.