System.Web.HttpRequest.ApplyUrlMapping C# (CSharp) Method

		internal string ApplyUrlMapping (string url)
		{
			if (urlMappings == null)
				return url;

			string relUrl = VirtualPathUtility.ToAppRelative (url);
			UrlMapping um = null;
			
			foreach (UrlMapping u in urlMappings) {
				if (u == null)
					continue;
				if (String.Compare (relUrl, u.Url, StringComparison.Ordinal) == 0) {
					um = u;
					break;
				}
			}

			if (um == null)
				return url;

			string rawUrl = VirtualPathUtility.ToAbsolute (um.MappedUrl.Trim ());
			Uri newUrl = new Uri ("http://host.com" + rawUrl);

			if (url_components != null) {
				url_components.Path = newUrl.AbsolutePath;
				url_components.Query = newUrl.Query.TrimStart (queryTrimChars);
				query_string_nvc = new WebROCollection ();
				HttpUtility.ParseQueryString (newUrl.Query, Encoding.Default, query_string_nvc);
				query_string_nvc.Protect ();
			} else
				BuildUrlComponents (newUrl.AbsolutePath, newUrl.Query);

			return url_components.Path;
		}