App Initialization for Sitecore PaaS prevent cold start up

AppInitialization.config

<?xml version="1.0"?>
<applicationInitialization
        doAppInitAfterRestart="true"
        skipManagedModules="true"
        remapManagedRequestsTo="WarmUp.html"
  >
  <!--This initialization in essential for autoscaling/swapping.
  List the pages that need to be warmed up before traffic is allowed in the webapp.  NOTE:No duplicate entries allowed-->
  
  <add initializationPage="/" />
  <add initializationPage="/page1" />
  <add initializationPage="/page2" />
</applicationInitialization>

web.config

      <configSections>
    <sectionGroup name="applicationInitialization" type="CustomConfig.applicationInitialization" >
      <section name="add" type="applicationInitialization.PageInit.CorePagesToWarmUp"/>
    </sectionGroup>
      </configSections>
      
          <rewrite>
      <rules>
        <rule name="No redirect on warmup request (initialization user agent)" stopProcessing="true" >
          <match url=".*" />
          <conditions>
            <add input="{HTTP_USER_AGENT}" pattern="Initialization" />
          </conditions>
          <action type="Rewrite" url="{URL}" />
        </rule>
        
        
            <applicationInitialization configSource="App_Config\AppInitialization.config" />
  </system.webServer>