Question

For an Asp.Net software as a service application, I want to do account based subdomains like Basecamp and the rest of the 37Signals products have. E.g. acme.myapp.com will load the account for that customer and pull back only their information.

This is easy to do in Ruby on Rails, but how would you handle this functionality in ASP.NET MVC and be able to scale to possibly hundreds of accounts?

Answer 1

We use:

public static string GetSubDomain()
        {
            string subDomain = String.Empty;

            if (HttpContext.Current.Request.Url.HostNameType == UriHostNameType.Dns)
            {
                subDomain = Regex.Replace(HttpContext.Current.Request.Url.Host, "((.*)(\\..*){2})|(.*)", "$2");
            }

            if (subDomain.Length == 0)
            {
                subDomain = "www";
            }

            return subDomain.Trim().ToLower();
        }