Cannot rely on HTTP_HOST 

https://bugsnag.com/errors/5217b6becf4cfd7373c945d8/events/newest

The above bug from my account shows

PHP Notice: Undefined index: HTTP_HOST

    /var/lib/openshift/5217b6484382ecd56c001d7d/app-root/runtime/repo/vendor/bugsnag/bugsnag/src/Bugsnag/Request.php:70 • [main]