Hi everyone,
I have a static site deployed on Vercel that works correctly on the project domain but hangs on my custom IDN domain.
Working domain: https://greenhouse-eosin.vercel.app/
Affected domain: https://www.xn–90ahalobcoje5a6c9c.xn–p1ai/
No redirect loop
Response starts with HTTP 200 OK
Body download stalls at ~21,085 bytes (out of 154,162 total)
Same deployment and content load fully on the .vercel.app domain
Re-added both domains (www and apex) in project settings
Set www as primary, apex as redirect
DNS is delegated to Vercel nameservers
Cleared local DNS and browser caches
Tested in multiple browsers
Verified with curl — custom domain stalls, .vercel.app completes
Something in edge routing / CDN path / TLS handling specific to IDN domains.
Has anyone experienced similar issues with IDN (punycode) domains? Any suggestions appreciated!
Hi mate! I tested both domains and couldn’t reproduce a global issue, both return 200 and load the full ~154 KB HTML with identical content, so this doesn’t look like a deployment or DNS problem.
Given your symptom (stalling around ~21 KB), this points to a region / edge / protocol-specific issue (likely a Vercel POP or HTTP/2/HTTP/3 behavior affecting the IDN hostname).
Things that would help confirm:
Force HTTP/1.1 vs HTTP/2 with curl
Test from another network (mobile/VPN)
Share a failing x-vercel-id
If it only happens in certain networks/regions, Vercel can trace it to a specific edge node.
I think your setup looks correct, this is very likely on the edge delivery side. hope this helps
Hi team hope this helps!
Behavior
200 OK returned
Response stalls at ~21 KB (expected ~154 KB)
No redirect loop
Reproducible by user (browser + curl)
.vercel.app works normally
Verification
When successful, both domains return identical content (same size, hash, headers)
Range requests work
DNS and deployment appear correct
Issue not globally reproducible
Interpretation
Likely edge-specific issue (region/POP/protocol), possibly:
HTTP/2 or HTTP/3 handling
cache inconsistency across edge nodes
punycode hostname routing/SNI differences
Helpful debugging data
Conclusion : not a project/config issue; likely isolated to specific edge nodes serving the custom IDN hostname.
pawlean
April 2, 2026, 6:40am
7
Seems to be working now, I tried connecting from the UK. Are you still seeing this?
1) x-vercel-id
arn1::5595f-1775209274782-579dda772cfd
In chrome was used http2 , after chrome.exe --disable-http2 --disable-quic site partly loaded
Cant added har file because of type of file even txt ( www.xn--90ahalobcoje5a6c9c.xn--p1ai - Google Docs )
Region and provider: St. Petersburg, Rostelecom
It’s depended on region Проверка доступности сайта по всему миру — General iT
I located in Russia and still have problem(
pawlean
April 6, 2026, 3:40pm
11
Could you go through this?
