Planetscale Cloudflare IP allow list support

This is a simple cloudflare worker to demonstrate that Planetscale ip restrictions need to include ipv6 support

How to use:

1. Create a cloudflare account (it's free)
2. Checkout this code then run:

pnpm install
pnpm wrangler login

4. Get the database url for your Planetscale databse and save it as a secret:

pnpm wrangler secret put DATABASE_URL

5. Deploy the app:

pnpm deploy

6. Open the preview url provided in your browser - you should see: Success - was able to connect and query the database

7. Add a Planetscale ip restriction rule with allow list from https://www.cloudflare.com/ips/

   103.21.244.0/22, 103.22.200.0/22, 103.31.4.0/22, 104.16.0.0/13, 
   104.24.0.0/14, 108.162.192.0/18, 131.0.72.0/22, 141.101.64.0/18, 
   162.158.0.0/15, 172.64.0.0/13, 173.245.48.0/20, 188.114.96.0/20, 
   190.93.240.0/20, 197.234.240.0/22, 198.41.128.0/17
   

8. Refresh you browser and you should see: Error - connection not allowed

PROBLEM SOLVED (Cloudflare should really update their docs)

Planetscale support did some testing and found this IP address is missing from the Cloudflare allow list:

104.16.0.0/12

Once that was added this app starts to work. The full IP allow list for Cloudflare should be:

103.21.244.0/22, 103.22.200.0/22, 103.31.4.0/22, 104.16.0.0/13, 
104.24.0.0/14, 108.162.192.0/18, 131.0.72.0/22, 141.101.64.0/18, 
162.158.0.0/15, 172.64.0.0/13, 173.245.48.0/20, 188.114.96.0/20, 
190.93.240.0/20, 197.234.240.0/22, 198.41.128.0/17,
104.16.0.0/12