Redirect HTTP to HTTPS with Host Name Site Collections

Question

By using Alternate Access Mapping, its possible to redirect HTTP to HTTPS.
as explained in this thread
http://social.msdn.microsoft.com/Forums/en-US/eaab487a-bc94-4f06-981b-c62711764367/redirect-http-to-https-for-sharepoint-2013
However what if I am using Host name site collections? My understanding is that the AAM will not work then... so how can I sure that 
http://intranet.contoso.com is automatically redirected to https://intranet.contoso.com ?
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Answer 1

This is not correct. You can't use URL rewrite with Host Named Site Collections in SharePoint. For URL rewrite to work you need to set bindings on web application which overrides Host Named Site Collection bindings in SharePoint (you have to chose either
web application bindings or let SharePoint handle that).
If you want to use URL Rewrite you need to create new Site in IIS7 which will listen on port 80 and rewrite URLs to port 443. This will create small overhead but you can save on resources by leveraging HNSC and have minimal number of web applications on
the server.
----Edit on 1/16/2014-----
I stand corrected. Above statement is NOT CORRECT. You can indeed perform HTTP to HTTPS URL rewrite with Host Named Site Collections (HNSC) quite elegantly. You do not need any additional web applications. In essence you can
build you whole farm with single web app on IIS (well two, since second one would be used for SharePoint services). Below is the example where I created single URL rewrite rule which handles any new host name provided they use same domain name (i.e. xxxxx.domain.com).
I have 20+ HNSCs in single web application and all of them are using URL rewrite.
        <rewrite>
            <rules>
                <rule name="Redirect to HTTPS" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions>
                        <add input="{SERVER_PORT}" pattern="443" negate="true" />
                    </conditions>
                    <action type="Redirect" url="https://{HTTP_HOST}.domain.com/{R:1}" />
                </rule>
            </rules>
        </rewrite>
You need to install URL rewrite plugin and configure binding the following way on your web app in IIS. This will allow rewrite to work and SharePoint will be able to handle hoast header bindings internally.