public static void ServeSitemap(string domainDataCode)
{
var request = HttpContext.Current.Request;
var response = HttpContext.Current.Response;
try
{
var lastModDate = Sitemap.GetLastCreated(domainDataCode).AsUtc();
if (lastModDate == null) // base code, return 404
{
throw new VoteException("No sitemap for {0}", domainDataCode);
}
// First check if the sitemap has been modified
var ifModifiedSinceHeader = request.Headers["If-Modified-Since"];
DateTime ifModifiedSince;
var isModified = true; // assume modified unless we prove otherwise
if (!string.IsNullOrWhiteSpace(ifModifiedSinceHeader) &&
DateTime.TryParse(ifModifiedSinceHeader, out ifModifiedSince))
{
isModified = false; // change our assumption
// If mod date is greater, we need to check for insignificant (< 1 sec)
// difference, because of lossy date conversions.
if (lastModDate > ifModifiedSince)
{
isModified = (lastModDate - ifModifiedSince) > TimeSpan.FromSeconds(1);
}
}
ServeSitemapContent(domainDataCode, lastModDate.Value, isModified);
}
catch (VoteException ex)
{
response.Write(ex.Message);
response.StatusCode = 404;
}
catch (Exception)
{
response.Write("Sitemap not available");
response.StatusCode = 404;
}
finally
{
response.End();
}
}
