Ruleset for "Breitbandmessung.de" breaks features

The current Ruleset for "Breitbandmessung.de" does not allow a HTTPS to HTTP Downgrade, which is needed for parts of the site.

The Following exclusion restores functionality:

<exclusion pattern="^http://breitbandmessung.de/(?:test|dev|edf|images|api|public)\" />

Complete Ruleset:

<ruleset name="Breitbandmessung.de">

        <exclusion pattern="^http://breitbandmessung.de/(?:test|dev|edf|images|api|public)\" />

        <target host="breitbandmessung.de"/>
        <target host="www.breitbandmessung.de"/>
        <target host="dbs.breitbandmessung.de"/>
        <target host="gis.breitbandmessung.de"/>

        <rule from="^http:" to="https:"/>
</ruleset>

Tested and Verified with Firefox 53.0 Ubuntu

Regards,