APP_API_GATEWAY_URL don't seem to work

[teotimepacreau]

i'm using damoeb/rss-proxy:2.1

either I don't understand APP_API_GATEWAY_URL either it don't works but every URL feed produce by rss-proxy are invalid in my RSS Reader (Miniflux), I tested the urls provided also on several RSS checker online, each time I get the following error :

This website is too slow to answer : Get "http://{myVPSpublicIP:port}/api/tf?url=https%3A%2F%2Fwww.teotimepacreau.fr%2Ffeed%2Ffeed.xml&re=none&out=atom": dial tcp myVPSpublicIP:port: i/o timeout.

{myVPSpublicIP:port} are my real numbers in the err message but i'm not exposing it here

so far I've tested to associate APP_API_GATEWAY_URL with the following values :

• http://myVPSpublicIP:portDedicatedToRSSPROXY
• http://myVPSpublicIP:anotherNonAttributedOpenPort
• https://blabla.mydomain.com

but never seem to work, am I doing something wrong ?