web.config redirect non-www to www - iis

Question

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.

Answer 1

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>
Reference

Answer 2

Other answers here are unnecessary long, here's the rule i use (just copy and paste) :
<rule name="ensurewww" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{CACHE_URL}" pattern="^(.+)://(?!www)(.*)" />
</conditions>
<action type="Redirect" url="{C:1}://www.{C:2}" redirectType="Permanent" />
</rule>
This will redirect to the www version while preserving the HTTP and HTTPS protocol
Hope this helps.

Answer 3

Since 2018, consider to use everytime https (SSL) !
So I use redirect to www and to https together.
<rule name="Redirect to www" stopProcessing="true">
<match url="(.*)" />
<conditions trackAllCaptures="false">
<add input="{HTTP_HOST}" pattern="^example.com$" />
</conditions>
<action type="Redirect" url="https://www.example.com/{R:1}" redirectType="Permanent" />
</rule>
<rule name="HTTP/S to HTTPS Redirect" enabled="true" stopProcessing="true">
<match url="(.*)" />
<conditions logicalGrouping="MatchAny">
<add input="{SERVER_PORT_SECURE}" pattern="^0$" />
</conditions>
<action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Permanent" />
</rule>
more info here :
https://forums.realmacsoftware.com/t/effective-july-2018-google-s-chrome-browser-will-mark-non-https-sites-as-not-secure/18597

Answer 4

I know this is an old post but it's not fully answered. I ended up extending Satpals answer
First rule catches http + www and second one catches non-www
For some reason i could not use MapProtocol in the fist Rule but it works with https written directly into the url.
<rewrite>
<rules>
<rule name="Special case www & HTTPS off" enabled="true" stopProcessing="true">
<match url="(.*)" />
<conditions logicalGrouping="MatchAll" trackAllCaptures="false">
<add input="{HTTP_HOST}" pattern="^www\.example\.com$" />
<add input="{HTTPS}" pattern="off" />
</conditions>
<action type="Redirect" url="https://www.example.com/{R:1}" redirectType="SeeOther" />
</rule>
<rule name="Redirect to www & HTTPS" enabled="true" stopProcessing="true">
<match url="(.*)" />
<conditions trackAllCaptures="false">
<add input="{HTTP_HOST}" pattern="^example\.com$" />
</conditions>
<action type="Redirect" url="{MapProtocol:{HTTPS}}://www.example.com/{R:1}" redirectType="SeeOther" />
</rule>
</rules>
<rewriteMaps>
<rewriteMap name="MapProtocol">
<add key="on" value="https" />
<add key="off" value="http" />
</rewriteMap>
</rewriteMaps>
</rewrite>

Answer 5

This worked fine for me:-
<rewrite>
<rules>
<rule name="Redirect to WWW" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^myExample.in$" />
</conditions>
<action type="Redirect" url="https://www.myExample.in/{R:0}" redirectType="Permanent" />
</rule>
</rules>
</rewrite>

Answer 6

This post is basically for those who need to redirect non-www to www URL in windows hosting.
In web.config file as below code:
<system.webServer>
<rewrite>
<rules>
<rule name=”Redirect example.com to www.example.com HTTP” patternSyntax=”ECMAScript” stopProcessing=”true”>
<match url=”.*” />
<conditions>
<add input=”{HTTP_HOST}” pattern=”^example.com$” />
<add input=”{HTTPS}” pattern=”off” />
</conditions>
<action type=”Redirect” url=”http://www.example.com/{R:0}” redirectType=”Permanent” appendQueryString=”true”/>
</rule>
<rule name=”Redirect example.com to www.example.com HTTPS” patternSyntax=”ECMAScript” stopProcessing=”true”>
<match url=”.*” />
<conditions>
<add input=”{HTTP_HOST}” pattern=”^example.com$” />
<add input=”{HTTPS}” pattern=”on” />
</conditions>
<action type=”Redirect” url=”https://www.example.com/{R:0}” redirectType=”Permanent” appendQueryString=”true”/>
</rule>
</rules>
</rewrite>
</system.webServer>
In the above code please note there are two rules used one for HTTP and another for HTTPS. To avoid clashing of HTTP and HTTPS in the same rule, here used two separate patterns.
I hope it works for you guys…!!

Answer 7

Follow the Step Below
Login to your website's cPanel
Click on Hosting Setting
Select your preferred domain as www.example.com