ServerChrome · Edge
ERR_HTTP2_PROTOCOL_ERRORHTTP/2 Protocol Error
The server sent an HTTP/2 response that violated the protocol spec. This is a server-side bug or configuration issue.
Why this happens
- Bug in the server's HTTP/2 implementation
- Load balancer and origin server have mismatched HTTP/2 settings
- A proxy or CDN is improperly terminating HTTP/2
- Server sent invalid HPACK headers
- Corrupted network state in your browser
How to fix it
- 1
Hard refresh the page (Ctrl+Shift+R)
- 2
Clear your browser cache completely
- 3
Try in a private window
- 4
If managing the site, check your reverse proxy's HTTP/2 config
Diagnose it faster
Use our free tools to check whether the issue is on your end or the server's: