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Created October 24, 2014 22:17
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URL rewrite rule for Azure CDN with Azure Websites origin which avoids interference from other URL rewrite rules when Azure CDN picks the wrong domain
Raw
Example.html
<html>
<head>
<title>Example.com</title>
</head>
<body>
<img src="//azxxxxxx.vo.msecnd.net/cdn/img/example.png" /> <!-- CDN will receive a HTTP 200 with the image content, thanks to the "CDN Passthrough" rewrite rule -->
<img src="//azxxxxxx.vo.msecnd.net/img/example.png" /> <!-- Normal Azure CDN URI which will recieve a 301 redirect if Azure CDN chooses www.example.com as the origin domain-->
<img src="/img/example.png" /> <!-- Non CDN edge cached content -->
</body>
</html>
Raw
Web.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name="CDN Passthrough" stopProcessing="true">
<match url="(.*)(cdn/)([\S]+)" />
<action type="Rewrite" url="{R:1}/{R:3}"/>
</rule>
<rule name="Remove WWW - Causes 301 redirect affecting the Azure CDN requests if it choses www.example.com as the origin domain" stopProcessing="true">
<match url="(.*)" />
<conditions>
<add input="{HTTP_HOST}" pattern="^(www\.)(.*)$" />
</conditions>
<action type="Redirect" url="http://{C:2}{PATH_INFO}" redirectType="Permanent" />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>
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