Remove index.php of Codeigniter on IIS?

I have WordPress in the root directory and my CodeIgniter application in a sub-directory. I create a similar web.config like yours and save it in the sub-directory. My CI app doesn't need the index.php in url any more.

At first, I add my sub-directory in the <action url="myapp/index.php/{R:1}"...> and wish it could be restricted to look into the sub-directory only but fails. I remove the sub-directory and leave it to original but move the web.config to the subdirectory and it works.

Therefore, I think maybe you may create two web.config files with different rules and saves them in different directory.

Another note might help: enable the error message to output the detail from IIS. I use the tricks to find out how IIS looks for my files. It is <httpErrors errorMode="Detailed" />, <asp scriptErrorSentToBrowser="true"/>, and the <system.web> section as below:

<?xml version="1.0" encoding="UTF-8"?><configuration>    <system.webServer>        <httpErrors errorMode="Detailed" />        <asp scriptErrorSentToBrowser="true"/>        <rewrite>        <rules>            <rule name="RuleRemoveIndex" stopProcessing="true">                <match url="^(.*)$" ignoreCase="false" />                <conditions>                    <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />                    <add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" />                </conditions>                <action type="Rewrite" url="index.php/{R:1}" appendQueryString="true"/>            </rule>        </rules>        </rewrite>    </system.webServer>    <system.web>        <customErrors mode="Off"/>        <compilation debug="true"/>    </system.web></configuration>

Make web.config put in the root directory.

User code:

 <?xml version="1.0" encoding="UTF-8"?>  <configuration> <system.webServer>    <httpErrors errorMode="Detailed" />    <asp scriptErrorSentToBrowser="true"/>    <rewrite>    <rules>        <rule name="RuleRemoveIndex" stopProcessing="true">            <match url="^(.*)$" ignoreCase="false" />            <conditions>                <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />                <add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" />            </conditions>            <action type="Rewrite" url="index.php/{R:1}" appendQueryString="true"/>        </rule>    </rules>    </rewrite></system.webServer><system.web>    <customErrors mode="Off"/>    <compilation debug="true"/></system.web>