So here is answer is anybody is interested and running Iris for Health in a container and front ended by the nginx webgateway container.

First - What ever url name you use in the web application configuration you will need to add to the nginx config file. See below

Next - when access the url be sure to add the trailing slash (/) otherwise you will get a "url not found on this server message. I'm not sure why this happens as both URLs *should* work?

Hope this helps.

Example:
URL Name: /csp/flask

You will need to add it to the CSP.conf file for the nginx config like the following

location /csp/flask {
    CSP ON;
    CSPNSD_pass 127.0.0.1:7038;
    CSPNSD_response_headers_maxsize 8k;
    CSPNSD_connect_timeout 300s;
    CSPNSD_send_timeout 300s;
    CSPNSD_read_timeout 300s;
}

The problem is that when you try to install the flask app you get the screenshot (1st) that says it cannot find a WSGI runtime (like flask or django).

The answer is, for a container, you need to install the flask runtime in the OS level not the virtual environment level.

Example would be like this (In the Dockerfile) to install the flask runtime during a container build. This will install the runtime correctly and you will not get the WSGI message when trying to create an application.
 

RUN apt install -y python3-flask
RUN apt install -y python3-django