HTTP 101 Switching Protocols vs 520 Web Server Returned an Unknown Error
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 520 (Web Server Returned an Unknown Error) 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, 520 means that cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
الوصف
The server understands the Upgrade header field request and indicates which protocol it is switching to.
متى تراه
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
كيفية الإصلاح
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
الوصف
Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
متى تراه
When Cloudflare receives an empty, unknown, or malformed response from the origin.
كيفية الإصلاح
Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.
الفروق الرئيسية
101 is a 1xx Informational response, while 520 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 520: Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 520 when when Cloudflare receives an empty, unknown, or malformed response from the origin.
متى تستخدم أيًا منهما
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 520 (Web Server Returned an Unknown Error): Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.