HttpContext.Current.Request.Url.Authority in NLB

  • Thread starter Thread starter Billy Zhang
  • Start date Start date
B

Billy Zhang

I have a NLB environment. 102 and 103 are the two machines' IP.
107 is the virtual IP. I used below code to get the URI.

public static string GetEnvironment()
{
return "http://" +
HttpContext.Current.Request.Url.Authority +
HttpContext.Current.Request.ApplicationPath.TrimEnd('/') + "/";
}

The problem is that:

sometimes I got 107, and sometimes I got 102. Why?
 
Hi Billy,

It seems the behavior you watched is likely the expected behavior. The
following thread was focus on the same issue:

NLB, IIS 6.0, .NET ASP Web App Randomly Changing URL From Hostname
http://bytes.com/groups/net/122411-nlb-iis-6-0-net-asp-web-app-randomly-chan
ging-url-hostname

As Nick Malik explained in it, within a NLB environment, the "Request.Url"
contains the url the NLB virtual server(proxy server) used to access the
backend physical server. And this is not reliable for using in your ASP.NET
page's code(to emit some links' url).

If you want to expose some absolute link, for ASP.NET page, here are some
recommended means:

1. As mentioned in the above article, you can use the front NLB virtual
address (FQDN name) instead of IP.
2. You can use "~/..." like url in your server control .e.g.

<asp:Image ImageUrl="~/images/xxxx.jpg" />

"~/..." means start from the application's root directory and will be
parsed by ASP.NET runtime correctly. If you want to use it in client-side
html markup, you can use code like this:

<img src='<%= ResolveUrl("~/images/xxx.jpg"") %>' />


Or you can use relative url so as to avoid include host name part.

If there is any further questions, please feel free to post here.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


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