Unhandled GZip Encoding

What happens when you have GZip turned on and there is an unhandled exception is thrown, look no further.. a completely cryptic garbage page is returned



So whats the problem, well when an unhandled exception is thrown ASP.NET/MVC removes the GZip header or any other custom header that was set and returns a non-zipped content while your IIS decides to send to browser that the content is GZipped when it's not really. So your browser is receiving a non-zipped content with GZIP content type, thus the garbage content.

To fix this in the global.ascx add the following to the Application_PreSendRequestHeaders function:

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protected void Application_PreSendRequestHeaders() {    if (HttpContext.Current != null && HttpContext.Current.Response != null)   {      HttpResponse response = HttpContext.Current.Response;      if (response.Filter is GZipStream &&            response.Headers["Content-encoding"] != "gzip")         {            response.AppendHeader("Content-encoding", "gzip");         }       else if (response.Filter is DeflateStream &&            response.Headers["Content-encoding"] != "deflate")         {            response.AppendHeader("Content-encoding", "deflate");         }    } }