This HTTP proxy, written in NodeJS, starts a Docker container on demand when an HTTP request is received.
It can be used to measure the time to first successful request on containers.
To run this use:
npm install node index.js
With the default settings it says
listening on port 9000, proxying to http://127.0.0.1:8080 with httpd:2.4.39-alpine on port 8080/80
Which means that an HTTP request on port 9000 starts the httpd:2.4.39-alpine Docker image and proxies the request to its 8080 port, noting the timings when doing so:
Starting container: httpd:2.4.39-alpine(20.660ms) Waiting on http://127.0.0.1:8080//index.html (23.164ms) Time to wait for http://127.0.0.1:8080//index.html: (1.282s) Proxying / (1.282s) Done proxying (1.284s)
The /80 port is the one that the container exposes.
The Docker image must be downloaded before running this, with docker pull ....
The --help option explains how to override the above values from the command-line.