title: iis 7.5 http response headers does not work
body: <p>I have some static content, jpg, png, in a specific folder.</p>
  
  <p>I woud like set HTTP headers to expire after 30 days.</p>
  
  <p>Using  IIS 7.5 >> http response headers >> Set common header >> Expire web content</p>
  
  <p>I added my value, but I I still get the HTTP header for static content as <code>(expiration not specified)</code>.</p>
  
  <p>I already tried to refresh my site in IIS but it did not solve my problem.</p>
  
  <p>Any idea? </p>