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).
설명
The server understands the Upgrade header field request and indicates which protocol it is switching to.
이 코드를 보게 되는 경우
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
해결 방법
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
설명
Cloudflare-specific. Cloudflare could not reach the origin server (DNS resolution failed or no route).
이 코드를 보게 되는 경우
When Cloudflare's DNS for the origin fails to resolve.
해결 방법
Verify DNS records in Cloudflare dashboard. Check origin server's IP address.
주요 차이점
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.
언제 어떤 것을 사용할지
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.