Rewrite rule for IIS rewrites everything to https

gistfile1.xml

<rule name="Redirect to HTTPS" stopProcessing="true">
    <match url="(.*)" />
    <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
        <add input="{HTTPS}" pattern="^OFF$" />
    </conditions>
    <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="Permanent" />
</rule>

courtesy of Sides of March 
http://www.sidesofmarch.com/index.php/archive/2014/09/02/forcing-iis-to-rewrite-all-requests-to-https/