A Cloudflare Worker used to handle requests to Azure Blob Storage using custom domains. The worker runs on a custom domain to capture GET requests and re-route them to Blob Storage, while also using Cloudflare's caching API to cache the returned assets.
Based on the "Configure your CDN" tutorial on Cloudflare Workers (https://developers.cloudflare.com/workers/tutorials/configure-your-cdn/)
This worker can run on multiple routes and domains, and uses a KV namespace to map the requested domain to an Azure Blob Storage account name and (optionally) a path prefix.
i.e., having:
- This Worker running on custom route
blob.mydomain.com - A KV entry:
"blob.mydomain.com": { "name": "my-az-account", "pathPrefix": "/container" }
A GET request to blob.mydomain.com/image.png will be routed to https://my-az-account.blob.core.windows.net/container/image.png
If the specified blob exists, it will be returned as the response and also cached by Cloudflare.
Cloudflare Account id and KV namespace bindings are specified in the wrangler.toml file as specified in the docs.
wrangler commands
Init and Scaffolding
wrangler config
wrangler generate projectname https://github.com/cloudflare/worker-template
Test (with watch - hot reload)
wrangler preview --watch