UrlRewrite needs to be installed.
Sample of the web.config, where the request to the old login page is redirected the root of the HTML5 application.
<configuration>
<location path="." inheritInChildApplications="false">
<system.webServer>
<handlers>
<add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
</handlers>
<aspNetCore processPath="dotnet" arguments=".\Origam.ServerCore.dll" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" hostingModel="inprocess" />
</system.webServer>
</location>
<system.webServer>
<rewrite>
<rules>
<rule name="Login redirect" stopProcessing="true">
<match url="^Login.*$" />
<action type="Redirect" url="https://html5.origam.com" appendQueryString="false" />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>