It won't actually generate any image content such as JPG or PNG; only text SVG will be return to the client.
Usage:
$ node server.js
Listening on port 8080
Example:
<img src="https://[YOUR_DOMAIN]/512x128" />
<img src="https://[YOUR_DOMAIN]/32x32" />
<img src="https://[YOUR_DOMAIN]/64x128" />
<img src="https://[YOUR_DOMAIN]/512x128+cross" />
<img src="https://[YOUR_DOMAIN]/512x128+border" />
<img src="https://[YOUR_DOMAIN]/512x128+cross+border" />