Preview maintenance mode locally

[m-vo]

In 423a683 the default configuration for authorized ips (lexik maintenance bundle) has been set to ['127.0.0.1'] as a quick fix for contao/core-bundle#1492.

How am I supposed to test the maintenance mode locally now (e.g. when working on a custom service_unavailable template) besides temporarily removing the setting again in my config like so (with the implications of the referenced ticket)?

lexik_maintenance:
    authorized:
        ips: []

btw.: The related PR in Symfony symfony/symfony#27309 that was in the way and leaded to the quickfix has been merged in 3.4.12.

[leofeyer]

We can revert the intermediate fix now.

[leofeyer]

Reverted in 5768cfe.