It seems that the ipv6 of api.machines.dev is unreachable. It fails when forcing it to use IPv6
curl -v -6 --max-time 10 https://api.machines.dev
* Immediate connect fail for 2a09:8280:1::8969: No route to host
The same happens to api.fly.io
curl -v -6 https://api.fly.io
* Immediate connect fail for 2a09:8280:1:f28:246e:d6a:949:dbbf: No route to host
While using the ipv4, it succeeds
curl -v -4 --max-time 10 https://api.machines.dev
If you just do curl -v https://api.machines.dev it works because curls falls back to IPv4 but calling it from Cloudflare workers as a fetch command, it’s failing.
This is a community forum, but is it a known issue ?
Hi Dalton,
Could you please clarify why I am receiving notifications from the community forum regarding other users’ technical details, such as IP addresses and public domains?
I would appreciate it if you could explain why these topics are being sent to my email.
Best regards,
Franklin A Quinones
Probably those are just post summaries that the forum software (Discourse) thought you might be interested in for one reason or another. You can generally turn those off in your personal settings in the forum’s preferences, under Emails.
It’s not something that OP is doing or has any influence over, 
…
After digging a bit more I realized that my home router had a connectivity issue with IPv6