HTTP 205 Reset Content vs 521 Web Server Is Down
HTTP 205 (Reset Content) is a 2xx Success response, while 521 (Web Server Is Down) is a 5xx Server Error response. 205 indicates that the server fulfilled the request and the client should reset the document view (e.g., clear a form). In contrast, 521 means that cloudflare-specific. The origin server refused the connection.
説明
The server fulfilled the request and the client should reset the document view (e.g., clear a form).
このコードが表示される場合
After form submissions where the server wants the client to reset the form for new input.
解決方法
The client should clear the form or reset the view. Rarely used in practice.
説明
Cloudflare-specific. The origin server refused the connection.
このコードが表示される場合
When Cloudflare can't establish a TCP connection to the origin server.
解決方法
Check that the origin server is running and the firewall allows Cloudflare IPs.
主な違い
205 is a 2xx Success response, while 521 is a 5xx Server Error response.
HTTP 205: The server fulfilled the request and the client should reset the document view (e.g., clear a form).
HTTP 521: Cloudflare-specific. The origin server refused the connection.
You encounter 205 when after form submissions where the server wants the client to reset the form for new input.
You encounter 521 when when Cloudflare can't establish a TCP connection to the origin server.
どちらをいつ使うか
For 205 (Reset Content): The client should clear the form or reset the view. Rarely used in practice. For 521 (Web Server Is Down): Check that the origin server is running and the firewall allows Cloudflare IPs.