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POIE 8 and client-side caching
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  1. POIE 8 and client-side caching
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    copied!<p><strong>Background story:</strong></p> <p>I have a web portal in .NET 3.5 on an IIS 6 web server. Currently there is a page that is given a value and based on that value looks up a PDF file on a web service and displays the results to the user in another tab in the web page. This is done with the following code.</p> <pre><code> context.Response.ClearContent(); context.Response.ClearHeaders(); context.Response.Clear(); context.Response.AddHeader("Accept-Header", pdfStream.Length.ToString()); context.Response.ContentType = "application/pdf"; context.Response.BinaryWrite(pdfStream.ToArray()); context.Response.Flush(); </code></pre> <p>This works and has worked for years. However we got an issue from the client that a particular client was having the PDF returned as the same PDF every time until they cleared temp internet cache.</p> <p>I thought oh cool, this is an easy one. I will just add the cache headers to the response to never cache it. So I added the following:</p> <pre><code>context.Response.Cache.SetCacheability(HttpCacheability.NoCache);//IE set to not cache context.Response.Cache.SetNoStore();//Firefox/Chrome not to cache context.Response.Cache.SetExpires(DateTime.UtcNow); //for safe measure expire it immediately </code></pre> <p>After a quick test I got exactly what I was expecting in the response header.</p> <pre><code>Cache-Control no-cache, no-store Pragma no-cache Expires -1 </code></pre> <p><strong>The Problem:</strong></p> <p>So this went live. Everything seemed cool day one. The day after, bam, everyone started getting white screens and no PDF displayed. After further investigation, I found out it was only IE 6,7,8. Chrome is fine, Firefox fine, safari fine, even IE 9 fine. Without knowing the why this happened, I reverted my change and deployed it, and everything started worked again.</p> <p>I have searched all over trying to find out why my caching headers seemed to confuse IE 6-8 to no avail. Has anyone experienced this type of issue with IE 6-8? Is there something I am missing? Thanks for any insight.</p>
 

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