Infinite Loop caused by wrong port configuration in nginx config

[frankmohaupt]

If I build the docker environment with the nginx image 1.19 I get an 400 Bad Request HTTP Error with the error Request Header Or Cookie Too Large.
This is caused, because of an infinite loop in one of the nginx config files (/etc/nginx/conf.d/default.conf)
In the server section the server listen at port 80 and has a proxy_pass to port 80. This causes the loop.
To fix this issue

magento-cloud-docker/images/nginx/1.19/Dockerfile

Line 8 in 26ad8a7

ENV UPSTREAM_PORT 80

need to be changed from 80 to 8080.