IIS7 URL Rewrite – Rewrite CSS files

iis-7rewrite

I'm trying to rewrite certain CSS files with some rules, so it replaces every single instance of links in the CSS (as in background: url("/myuri.jpg")) with a prefix (as in background: url("/zeus/myuri.jpg"))

These are the rules.

<rule name="ReverseProxyOutboundRule2" preCondition="IsCSS" enabled="true" stopProcessing="false">
    <match filterByTags="None" pattern="url\(&quot;(.*)&quot;\)" />
    <action type="Rewrite" value="url(&quot;/zeus{R:1}&quot;)" />
    <conditions>
        <add input="{URL}" pattern="/zeus" />
    </conditions>
</rule>

<preCondition name="IsCSS">
    <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/css" />
</preCondition>

However, only one url is being replaced this way and somehow the rest is being ignored.

Thank you beforehand.

Best Answer

It's your regular expression pattern.

You've used url\("(.*)"\), which after hitting your first url will greedily match every character up to the last quote in your file. It's not obvious because your replacement simply prefixes the matched content, so it appears that only the first url was touched.

Try using a lazy quantifier, i.e. .*? inside your capture expression. This will match the fewest characters up to the next quote.

Related Solutions

IIS7 URL Rewrite and Symbols

Wow, it just so happens that Ruslan from the IIS team has been helping me with an almost identical problem over the last two days.

IIS (HTTP.sys) will parse your URL for you - for example, http://site///////dir////file serves you the same content as http://site/dir/file. It will leave the query string alone, but at this point, as we are using pretty URLs, the value is not yet in the query string!

The unencoded URL is stored in a server variable named UNENCODED_URL. You can do something like this to get that value into a capture variable:

<rule name="something" stopProcessing="true">
    <match url=".*" ignoreCase="false" />
    <conditions logicalGrouping="MatchAll">
        <add input="{URL}" negate="true" pattern="^/index\.php" ignoreCase="false" />
        <add input="{QUERY_STRING}" pattern="^$" ignoreCase="false" />
        <add input="{UNENCODED_URL}" pattern="/(.*)" />
    </conditions>
    <action type="Rewrite" url="/index.php?title={C:1}" appendQueryString="true" />
</rule>

You then map to it with a back-reference to the condition.

IIS7 URL ReWrite Module: Force to root

For anyone who arrives here via Google, I managed to get it to work with the following rule:

<rewrite>
<rules>
        <clear />
        <rule name="Force HTTP" stopProcessing="true">
            <match url="(.*)" />
            <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
                <add input="{HTTPS}" pattern="on" />
            </conditions>
            <action type="Redirect" url="/{R:1}" redirectType="Temporary" />
        </rule>
        <rule name="Allow Local Resources" stopProcessing="true">
            <match url=".*" />
            <conditions logicalGrouping="MatchAny" trackAllCaptures="false">
                <add input="{REQUEST_FILENAME}" pattern="SiteMaintenance.png" />
                <add input="{REQUEST_FILENAME}" pattern="Stylesheet.css" />
            </conditions>
            <action type="None" />
        </rule>
        <rule name="Check Is Root" stopProcessing="true">
            <match url="^.+$" negate="false" />
            <conditions logicalGrouping="MatchAny" trackAllCaptures="false" />
            <action type="Redirect" url="/" appendQueryString="false" redirectType="Temporary" />
        </rule>
</rules>
</rewrite>

No idea if this is the best way, but it worked for me.

Best Answer

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IIS7 URL Rewrite and Symbols

IIS7 URL ReWrite Module: Force to root

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