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PORemoving Server header from static content in IIS 7/8
 

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    <p>As part of an effort to make our API and site more secure, I'm removing headers that leak information about what the site is running.</p> <p>Example before stripping headers:</p> <pre><code>HTTP/1.1 500 Internal Server Error Cache-Control: private Content-Type: text/html; charset=utf-8 Server: Microsoft-IIS/8.0 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Wed, 05 Jun 2013 00:27:54 GMT Content-Length: 3687 </code></pre> <p>Web.config:</p> <pre><code>&lt;httpProtocol&gt; &lt;customHeaders&gt; &lt;remove name="X-Powered-By" /&gt; &lt;/customHeaders&gt; &lt;/httpProtocol&gt; </code></pre> <p>Global.asax.cs:</p> <pre><code>protected void Application_PreSendRequestHeaders() { Response.Headers.Remove("Server"); Response.Headers.Remove("X-AspNet-Version"); Response.Headers.Remove("X-AspNetMvc-Version"); Response.AddHeader("Strict-Transport-Security", "max-age=300"); Response.AddHeader("X-Frame-Options", "SAMEORIGIN"); } </code></pre> <p>And after that, all calls to the site and API return safer headers, like so:</p> <pre><code>HTTP/1.1 500 Internal Server Error Cache-Control: private Content-Type: text/html; charset=utf-8 Date: Wed, 05 Jun 2013 00:27:54 GMT Content-Length: 3687 </code></pre> <p>So far, so good. However, I've noticed in Firebug that if you look at static content (loading.gif, for example), it still includes the server header.</p> <pre><code>HTTP/1.1 304 Not Modified Cache-Control: no-cache Accept-Ranges: bytes Etag: "a3f2a35bdf45ce1:0" Server: Microsoft-IIS/8.0 Date: Tue, 25 Jun 2013 18:33:16 GMT </code></pre> <p>I'm assuming this is being handled by IIS somehow, but can't find anywhere to remove that header. I've tried adding:</p> <pre><code>&lt;remove name="Server" /&gt; </code></pre> <p>to the httpProtocol/customHeaders section in Web.config, as mentioned above. I've also tried going into the IIS Manager's HTTP Response Headers section and adding a fake name/value pair for the Server header. In both cases, it still returns</p> <pre><code>Server: Microsoft-IIS/8.0 </code></pre> <p>when loading any images, CSS, or JS. Where/what do I need to set something to fix this?</p>
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