Modify Shellhttpd

To change the environment values on the fly without restarting the app, you will edit httpd.sh. Open a new terminal on your host and find the container folder used previously.

cd containers/

Edit httpd.sh as below:

gedit shellhttpd/httpd.sh

#!/bin/sh -e

PORT="${PORT-8080}"
MSG="${MSG-FoundriesFactory}"

while true; do
        [ -f /home/shellhttpd/shellhttpd.conf ] && . /home/shellhttpd/shellhttpd.conf
        echo "PORT=$PORT"
        echo "MSG=$MSG"
        RESPONSE="HTTP/1.1 200 OK\r\n\r\n${MSG}\r\n"
        echo -en "$RESPONSE" | nc -w 5 -l -p "${PORT}" || true
        echo "= $(date) ============================="
done

The first line in the while loop will check for the file /home/shellhttpd/shellhttpd.conf. If it exists, it will load the variables specified in the file. Then, echo will print the values of PORT and MSG. RESPONSE will be redefined with the new MSG value.

Finally, -w 5 configures nc to stop listening every 5 seconds. This allows the script to reload new variables.