Node.js one-liner JavaScript
A JavaScript snippet for Node.js one-liner that answers requests for /pixel.gif with the empty GIF, decoded once at startup.
Node.js one-liner JavaScript
node -e "require('node:fs').writeFileSync('pixel.gif', Buffer.from('R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==', 'base64'))"
We ran this snippet and compared the bytes it returned.
Official site: Node.js one-liner