App Store app using Web Service calls with UnsafeHeaderParsing

Hello,

I'm writing a App store C# application which is calling into a third party web service (on Apache).  However I'd getting an error returned, and it would seem I need to enable using Unsafe Header Parsing.

I've looked at the code samples online - all state use app.config settings or Reflection to amend the HttpWebRequest properties to enable  unsafe header parsing - however I am unable to so this for an App Store application. 

i.e.

http://social.msdn.microsoft.com/Forums/en-US/ff098248-551c-4da9-8ba5-358a9f8ccc57/how-do-i-enable-useunsafeheaderparsing-from-code-net-20?forum=netfxnetcom

Has anyone else come across this issue and successfully resolve it.  Or can provide any pointers?

Many thanks