title: Add custom header based on file type
body: <p>We are trying to add a custom header (X-Robots-Tag) for sitemap files in IIS 7.5. However, it does not appear that IIS supports custom headers based on a file type or wildcard (only subfolders).</p>
  
  <p>Can we add a custom header for only *.xml.gz files via Web.config?</p>
  
  <p>We would like to avoid making the customization via code or on our load balancer.</p>