How to disable unescaping of %2F in querystrings using WCF webHttpBinding

Question

I'm calling into a WCF Data Service that passes parameters via query string.

Sometimes, some of the keys contain special characters that are normally blocked, e.g. %2F (/) %5C (/) %23 (#) and so forth.

The service returns a 400 when any of these characters are passed - even in their escaped format.

The IIS tracelog shows the following:

ModuleName ServiceModel-4.0 Notification 2 HttpStatus 400 HttpReason Bad Request HttpSubStatus 0 ErrorCode 0 ConfigExceptionInfo
Notification AUTHENTICATE_REQUEST ErrorCode The operation completed successfully. (0x0)

indicating that the ServiceModel module set a HttpStatus of 400 and returned.

Are there configuration values that prevent WCF from unescaping similar to the .net/IIS settings found at:

msdn.microsoft.com/en-us/library/ee656542.aspx (Uri) www.iis.net/ConfigReference/system.webServer/security/requestFiltering (IIS/unescapeQueryString)

Thanks,