CODEWITHSUNDEEP
c#asp.netip
thomvlau
thomvlau

Reputation: 602

HTTP_X_FORWARDED_FOR missing from servervariables in c#

I would like to get the ClientIPaddress but when I call to Request.ServerVariables["HTTP_X_FORWARDED_FOR"] I always get NULL.

After checking the list of the Servervariables I noticed that HTTP_X_FORWARDED_FOR is not in the list of options.

Anyone knows how this is possible and how to solve? Or is it normal that this option is not in the list and I'm missing something.

Thanks in advance

Upvotes: 8

Views: 36288

Answers (4)

Hamid Talebi
Hamid Talebi

Reputation: 1318

If you run it on local machine , it's normal to don't see any thing, otherwise you run it in on a real external host.

.net HTTP_X_FORWARDED_FOR NULL on localhost

Upvotes: 2

Bahman Hero
Bahman Hero

Reputation: 61

public string GetIPAddress()
{
    System.Web.HttpContext context = System.Web.HttpContext.Current;
    string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

    if (!string.IsNullOrEmpty(ipAddress))
    {
        string[] addresses = ipAddress.Split(',');
        if (addresses.Length != 0)
        {
            return addresses[0];
        }
    }

    return context.Request.ServerVariables["REMOTE_ADDR"];
}

This method maybe useful for you.

Upvotes: 6

George Kosmidis
George Kosmidis

Reputation: 359

Please try this:

public static string GetUserIP() {   
    var ip = ( HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null
          && HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != "" )
         ? HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]
         : HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
    if (ip.Contains( "," ))
        ip = ip.Split( ',' ).First();
    return ip.Trim();
}

Found here:
http://mycodepad.wordpress.com/2013/04/26/c-getting-a-user-ip-behind-a-proxy-http_x_forwarded_for/

Upvotes: 4

tosc
tosc

Reputation: 759

Request.ServerVariables["HTTP_X_FORWARDED_FOR"] will only have a value, if the request was forwarded by a proxy. Usually you will get the client IP by using Request.ServerVariables["REMOTE_ADDR"].

Upvotes: 11

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