I need to redirect non-www URLs to www URL for both HTTP and HTTPS URLs. I tried following rules in web.config
.
<rule name="Redirect to WWW" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^example.com$" />
</conditions>
<action type="Redirect" url="http://www.example.com/{R:0}" redirectType="Permanent" />
</rule>
<rule name="Redirect to WWW https" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{HTTPS}" pattern="^example.com$" />
</conditions>
<action type="Redirect" url="https://www.example.com/{R:0}" redirectType="Permanent" />
</rule>
It works perfectly for non-ssl URL but in case of SSL it redirect from https://example.com
to http://www.example.com
.
For a safer rule that works for both Match Any
and Match All
situations, you can use the Rewrite Map solution. It’s a perfectly good solution with the only drawback being the ever so slight extra effort to set it up since you need to create a rewrite map before you create the rule. In other words, if you choose to use this as your sole method of handling the protocol, you’ll be safe.
You can create a Rewrite Map called MapProtocol, you can use {MapProtocol:{HTTPS}}
for the protocol within any rule action.
<rewrite>
<rules>
<rule name="Redirect to www" stopProcessing="true">
<match url="(.*)" />
<conditions trackAllCaptures="false">
<add input="{HTTP_HOST}" pattern="^example.com$" />
</conditions>
<action type="Redirect"
url="{MapProtocol:{HTTPS}}://www.example.com/{R:1}" />
</rule>
</rules>
<rewriteMaps>
<rewriteMap name="MapProtocol">
<add key="on" value="https" />
<add key="off" value="http" />
</rewriteMap>
</rewriteMaps>
</rewrite>