IIS - Cache Control must-revalidate"

Reference : Deploying to Microsoft Internet Information Server (IIS) | Gatsby (gatsbyjs.com)

<?xml version="1.0" encoding="UTF-8"?>

<configuration>

    <location path="static">

        <system.webServer>

            <httpProtocol>

                <customHeaders>

                    <remove name="cache-control" />

                    <add name="cache-control" value="public, max-age=31536000, immutable" />

                </customHeaders>

            </httpProtocol>

        </system.webServer>

    </location>

    <location path="page-data">

        <system.webServer>

            <httpProtocol>

                <customHeaders>

                    <remove name="cache-control" />

                    <add name="cache-control" value="public, max-age=0, must-revalidate" />

                </customHeaders>

            </httpProtocol>

        </system.webServer>

    </location>

    <system.webServer>

        <staticContent>

            <mimeMap fileExtension=".webmanifest" mimeType="application/manifest+json" />

        </staticContent>

        <rewrite>

            <outboundRules>

              <rule name="AdjustCacheForDontCacheFiles" preCondition="IsDontCacheFile" stopProcessing="true">

                <match serverVariable="RESPONSE_Cache-Control" pattern=".*" />

                <action type="Rewrite" value="public, max-age=0, must-revalidate" />

              </rule>

              <rule name="AdjustCacheForCachePermanentlyFiles" preCondition="IsCachePermanentlyFile" stopProcessing="true">

                <match serverVariable="RESPONSE_Cache-Control" pattern=".*" />

                <action type="Rewrite" value="public, max-age=31536000, immutable" />

              </rule>

              <preConditions>

                <preCondition name="IsDontCacheFile">

                  <add input="{REQUEST_FILENAME}" pattern="(.*\.html)|(sw\.js)|(app\-data\.json)|(page\-data\.json)" />

                </preCondition>

                <preCondition name="IsCachePermanentlyFile">

                  <add input="{REQUEST_FILENAME}" pattern="((.*\.js)|(.*\.css))$" />

                </preCondition>

              </preConditions>

            </outboundRules>

        </rewrite>

    </system.webServer>

</configuration>