Does not work with port setting

[earthlyreason]

We are running CKAN in an environment with dynamic PORT allocation (Heroku). To deal with that, we have a startup process that uses sed to interpolate PORT (and a few other settings) into the .ini file.

It looked like ckanext-envvars would be a cleaner approach.

However, when setting CKAN___PORT in lieu of the config setting, the site simply wouldn't load. Restoring a port setting in the actual config would fix it. I got the same sense as the reporter of #1, that the config values weren't being set early enough in the process for some of their readers.

Has this extension been tested with the port setting? Are there known settings (other than plugins) that cannot be expected to work?