IIS Rewrite Rule for Lower Case URL's

Question

I have a IIS Rewrite Rule to convert all URL's to lower case

<rewrite>
    <rules>
        <rule name="LowerCaseRule1" stopProcessing="true">
            <match url="[A-Z]" ignoreCase="false" />
            <action type="Redirect" url="{ToLower:{URL}}" />
        </rule>
    </rules>
</rewrite>

However it only converts a part of the url to lowercase and does not convert querystrings. For example ID is not coverted to id

http://www.itsmysitesitesite.com/showproduct.aspx?ID=230

How can I modify the above rule to include query strings too?

Answer 1

Based on my comment (referencing this question) I would imagine the rule would look something like this:

<rule name="URL Lower" enabled="true" stopProcessing="true">
      <match url="[A-Z]" ignoreCase="false" />                        
      <conditions trackAllCaptures="true">
          <add input="{QUERY_STRING}" pattern="(.*)" />
          <add input="{QUERY_STRING}" pattern="([A-Z]+)" ignoreCase="false" />
      </conditions>
      <action type="Redirect" url="{ToLower:{URL}}{ToLower:{C:1}}" appendQueryString="false" />
 </rule>

A disclaimer though, I'm working on Windows XP so I've only got IIS 6.0, so I can't check the syntax is correct! Might require a bit of tweaking...

Answer 2

I wasn't able to make one rule that would capture both the {URL} and {QUERY_STRING} and also display the url the way I wanted it to. So, I split it into two rules.

URL to Lowercase

<rule name="UrlToLowercase" stopProcessing="true">
  <match url=".*[A-Z].*" ignoreCase="false" />
    <conditions>                          
      <add input="{REQUEST_METHOD}" matchType="Pattern" pattern="POST" ignoreCase="true" negate="true" />
      <add input="{URL}" pattern="^.*\.(axd|css|js|jpg|jpeg|png|gif|txt|xml|svg|pdf)$" negate="true" ignoreCase="true" /> 
    </conditions>
    <action type="Redirect" redirectType="Permanent" url="{ToLower:{URL}}" />
</rule> 

URL with Query String to Lowercase

<rule name="UrlWithQueryStringToLowercase" stopProcessing="true">
  <match url="(.*)" ignoreCase="false" />
    <conditions trackAllCaptures="true">   
      <add input="{QUERY_STRING}" pattern="(.*)" /> 
      <add input="{QUERY_STRING}" pattern=".*[A-Z].*" ignoreCase="false" />
      <add input="{REQUEST_METHOD}" matchType="Pattern" pattern="POST" ignoreCase="true" negate="true" />
    </conditions>
    <action type="Redirect" redirectType="Permanent" url="{ToLower:{URL}}?{ToLower:{C:0}}" appendQueryString="false" />
</rule>

This should cover every case and if it doesn't, please let me know. :)

I added some extra conditions that you may want to leave in or take out.

<add input="{URL}" pattern="^.*\\.(axd|css|js|jpg|jpeg|png|gif|txt|xml|svg|pdf)$" negate="true" ignoreCase="true" /> ignores paths that end in axd, css, js, jpg, ...etc. Without this rule, you will not be able to load a file with uppercase letters from your server.

<add input="{REQUEST_METHOD}" matchType="Pattern" pattern="POST" ignoreCase="true" negate="true" /> will ignore requests with a POST method. Without this rule, POSTs that specify uppercase urls will lose data because of the 301 (GETs do not have this problem).