How to stress test a local webapp?

Today a want to stress-test my local webapp but I don't know how. I currently use a simple shell script

#!/bin/sh

while [ true ]
do
        curl http://localhost:5000/cabinet-dentaire-nice/cab &> /dev/null
done

But this is not exactly what i want.

I want to test it with a lot of requests in the same time and not a fast squence of requests. How can i do it ?