Last year, I describe WebApps with File Share for hosting static website.
I find another way.
WebApps can ARR if you transform applicationHost.
<!-- D:\home\site\applicationHost.xdt -->
<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<system.webServer>
<proxy xdt:Transform="InsertIfMissing"
enabled="true"
preserveHostHeader="false"
reverseRewriteHostInResponseHeaders="false" />
</system.webServer>
</configuration>
<!-- D:\home\site\wwwroot\web.config -->
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<httpErrors errorMode="Detailed" />
<urlCompression doStaticCompression="false" doDynamicCompression="false" />
<rewrite>
<rules>
<rule name="BlobNotSlashEnd">
<match url="^.*[^/]$" />
<action url="https://storageaccount.blob.core.windows.net/containername{PATH_INFO}" type="Rewrite" />
</rule>
<rule name="BlobSlashEnd">
<match url="^.*/$" />
<action url="https://storageaccount.blob.core.windows.net/containername{PATH_INFO}index.html" type="Rewrite" />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>