title: Understanding how images are served and cached
body: <p>So I'm wondering how browsers treat requests for images. I'm hoping to use a cdn for serving product images on my website. I'd also like to use the cdn for serving button images and images used in my css.</p>
  
  <p>The problem with this is that I don't have control over the expires headers (Rackspace files is what I'm looking into).</p>
  
  <p>See, say I have a large image file as a background on my home page. So the page is accessed often, but the image stays the same. Is the browser going to request this image every time?</p>
  
  <p>Or should I just use a cdn for my product images?</p>