MVC 3 compression filter causing garbled output

Question

So, I have a custom attribute called CompressAttribute which is set up as a global filter in global.asax. It uses reflection to examine the return type of the current action

Answer 1

I had this same problem in asp.net mvc 1.0 browsing for a page that had a RenderAction inside (from the futures assembly). Apparently the problem was that the response was being encoded twice. I had to create an action filter for this child actions so that a flag is set in the DataTokens collection of the RouteData. Then I had to modify the compress filter so that it returned in case the flag was set. I also had to deal with the execution order of the filters. Maybe this can help, verify if the compress filter is being called more than one time when an error page is raised.