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HttpContext.Current returning null when using NetTcpBinding in WCF4

When using NetTcpBinding, not all of the features of WCF are available, particularly those using HTTP. NetTcpBinding removes a dependency on HTTP (and IIS as a result, allowing the service to be hosted in WAS instead.)

HttpContext.Current is one of the features in WCF that is not available when using NetTcpBinding.