Generate arbitrary size file on Cloudflare Workers.

You can use this service to test your network download speed.

wget https://file.ringring.workers.dev/100m
wget https://file.ringring.workers.dev/1g
wget https://file.ringring.workers.dev/500k

• No transfer speed limit, since it is based on Cloudflare Workers worldwide.
• No file size limit. The service use stream to generate file internally.
• Download time should under 30s, otherwise the worker may abort.