如何在WCF Web服务中读取HTTP请求标头？

In a WCF web service, how does one read an HTTP/HTTPS request header? In this case, i'm trying to determine the original URL host the client used. This might be in the X-Forwarded-Host header from a load balancer, or in the Host header if it's direct-box.In a WCF web service, how does one read an HTTP