ASP. NET Get client IP

String requestclientipaddress = httpcontext.current.request.servervariables["Http_x_forwarded_for"];if (string. IsNullOrEmpty (requestclientipaddress))    requestclientipaddress = httpcontext.current.request.servervariables[ "Remote_addr"];if (string. IsNullOrEmpty (requestclientipaddress))    requestclientipaddress = HttpContext.Current.Request.UserHostAddress;

When load balancing is tested, httpcontext.current.request.servervariables["Http_x_forwarded_for" takes out the real client IP address, and httpcontext.current.request.servervariables["REMOTE_ADDR") and HttpContext.Current.Request.UserHostAddress The assigned reserved address is taken out.

Note: x-forwarded-for: referred to as Xff Head, it represents the client, that is, the HTTP request side of the real IP, only when the HTTP proxy or load Balancer server is added to the item