[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Vercel custom IDN domain returns HTTP 200 but response body stalls during download 36 views · 0 likes · 7 posts Ivanfalkov (@ivanfalkov) · 2026-03-31 Hi everyone, I have a static site deployed on Vercel that works correctly on the project domain but hangs on my custom IDN domain. ## Affected Domains **Working domain:** **[https://greenhouse-eosin.vercel.app/](https://greenhouse-eosin.vercel.app/)** — full page loads normally **Affected domain:** **[https://www.xn–90ahalobcoje5a6c9c.xn–p1ai/](https://www.xn--90ahalobcoje5a6c9c.xn--p1ai/)** — browser shows infinite loading ## Issue Details * 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 ## What I've Tried 1. Re-added both domains (`www` and apex) in project settings 2. Set `www` as primary, apex as redirect 3. DNS is delegated to Vercel nameservers 4. Cleared local DNS and browser caches 5. Tested in multiple browsers 6. Verified with `curl` — custom domain stalls, `.vercel.app` completes ## My Guess Something in edge routing / CDN path / TLS handling specific to IDN domains. Has anyone experienced similar issues with IDN (punycode) domains? Any suggestions appreciated! Al441395 (@al441395-9679) · 2026-03-31 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 Al441395 (@al441395-9679) · 2026-03-31 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** * Failing `x-vercel-id` * HAR file * Affected region/ISP * Whether HTTP/1.1 avoids the issue **Conclusion**: not a project/config issue; likely isolated to specific edge nodes serving the custom IDN hostname. Pauline P. Narvas (@pawlean) · 2026-04-02 Seems to be working now, I tried connecting from the UK. Are you still seeing this? Ivanfalkov (@ivanfalkov) · 2026-04-03 **1) x-vercel-id** arn1::5595f-1775209274782-579dda772cfd  2. In chrome was used http2 , after `chrome.exe --disable-http2 --disable-quic` site partly loaded  3. Cant added har file because of type of file even txt ( https://docs.google.com/document/d/1I7gQNrt-1fn3LaSrh5PjuXo53Fypwaf9DyUK91JTATI/edit?tab=t.0 ) 4. Region and provider: St. Petersburg, Rostelecom 5. It’s depended on region https://g-i-t.ru/domains/site-availability/?domain=xn--90ahalobcoje5a6c9c.xn--p1ai Ivanfalkov (@ivanfalkov) · 2026-04-03 I located in Russia and still have problem( Pauline P. Narvas (@pawlean) · 2026-04-06 Could you go through this? https://community.vercel.com/t/resolving-ip-blocking-issues/171
