[selfhoster69]

This is a little weird for me:

Using Cloudflare's 1.1.1.1:

  ~> curl -s --doh-url https://cloudflare-dns.com/dns-query https://mensura.cdn-apple.com/api/v1/gm/config | jq -r .test_endpoint
  sgsin3-edge-bx-008.aaplimg.com
  PING sgsin3-edge-bx-008.b.aaplimg.com (17.253.61.15) 56(84) bytes of data.
  64 bytes from sgsin3-edge-bx-008.b.aaplimg.com (17.253.61.15): icmp_seq=1 ttl=52 time=74.2 ms

If I use 8.8.8.8:

  ~> curl -s --doh-url https://dns.google/dns-query https://mensura.cdn-apple.com/api/v1/gm/config | jq -r .test_endpoint
  hkhkg1-edge-bx-007.aaplimg.com
  ~> ping hkhkg1-edge-bx-007.aaplimg.com
  PING hkhkg1-edge-bx-007.aaplimg.com (17.253.85.13) 56(84) bytes of data.
  64 bytes from hkhkg1-edge-bx-007.aaplimg.com (17.253.85.13): icmp_seq=1 ttl=54 time=107 ms

Seems like I'm two different PoPs depending on which DNS I'm using.

[lxgr]

Where are you actually located?

1.1.1.1 does not support the EDNS client subnet header [1], which means that practically, the CDN's DNS server will see your request as originating from your nearest 1.1.1.1 resolver.

8.8.8.8 does, so if the CDN evaluates it, you might get a better match (or a worse one!)

[1] https://developers.cloudflare.com/1.1.1.1/faq/#does-1.1.1.1-...

[miyuru]

EDNS makes a huge difference as many CDNS still use it.

Here is a test I did 4 years back. https://blog.miyuru.lk/edns-geo-table-2019/

I have a tinfoil-hat theory that CF removed EDNS support to make other CDNs slow and make their own CDN look good, but if there's a CF POP nearby it does not make much difference.

[dweekly]

From the article:

Apple's test_endpoint changes on each request, selecting a different nearby server to reduce latency and distributing their server load.

[detaro]

why is that weird?