HTTP 101 Switching Protocols vs 523 Origin Is Unreachable
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 523 (Origin Is Unreachable) is a 5xx Server Error response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 523 means that cloudflare-specific. Cloudflare could not reach the origin server (DNS resolution failed or no route).
Mô tả
The server understands the Upgrade header field request and indicates which protocol it is switching to.
Khi bạn thấy mã này
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
Cách khắc phục
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
Mô tả
Cloudflare-specific. Cloudflare could not reach the origin server (DNS resolution failed or no route).
Khi bạn thấy mã này
When Cloudflare's DNS for the origin fails to resolve.
Cách khắc phục
Verify DNS records in Cloudflare dashboard. Check origin server's IP address.
Sự khác biệt chính
101 is a 1xx Informational response, while 523 is a 5xx Server Error response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 523: Cloudflare-specific. Cloudflare could not reach the origin server (DNS resolution failed or no route).
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 523 when when Cloudflare's DNS for the origin fails to resolve.
Khi nào dùng cái nào
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 523 (Origin Is Unreachable): Verify DNS records in Cloudflare dashboard. Check origin server's IP address.