The table below explains the status codes of CDN.
|0||The request ends before the status code is obtained||Check whether the client disconnects the request early, or whether the origin-pull fails.|
|400||HTTP request syntax error
The server cannot parse the request
|Check whether the request syntax is correct.|
|403||Request is rejected||Check whether the request is blocked by access controls such as referer blocklist/allowlist, IP blocklist/allowlist, and authentication.|
|413||Content length of the POST request exceeds the limit||Check the content size of the POST request from the client (the maximum size is 32 MB by default).|
|414||URL length exceeds the limit||The maximum URL size is 2 KB by default.|
|423||Looping request||Check the 301/302 configuration, HTTPS origin-pull, and rewriting method of the origin server.|
|499||The client closes the connection||Check the client status and timeout configuration.|
|502||Gateway Error||Check whether the business origin server is normal.|
|503||COS frequency control is triggered||Check the cache configuration or whether the COS origin server returns no-cache/no-store.|
|504||Gateway timeout||Please contact the official website.|
|509||Blocked due to CC attack||Contact Us or submit a ticket to unblock it.|
|514||IP access frequency exceeds the limit||Check the IP access frequency control configuration in the CDN Console.|
|531||Error resolving the origin-pull domain name in the HTTP request||Check the domain name resolution configuration of the origin server.|
|532||Failed to establish a connection with the origin server in the HTTPS request||Check the port 443 status of the origin server, certificate configuration, or availability of the origin server.|
|533||Origin-pull connection timeout in the HTTPS request||Check the port 443 status of the origin server, certificate configuration, or availability of the origin server.|
|537||Origin server data reception timeout in the HTTPS request||Check the stability of the business origin server.|
|538||SSL handshake of HTTPS request failed||Check the compatibility between the origin server protocol and algorithm.|
|539||Certificate validation of HTTPS request failed||Check whether the certificate of the origin server is correctly configured (validity period and completeness of the certificate chain).|
|540||Certificate domain name validation of HTTPS request failed||Check whether the certificate of the origin server is correctly configured.|
|562||Failed to establish a connection in the HTTPS request||Contact Us with the X-NWS-LOG-UUID information or submit a ticket for troubleshooting.|
|563||Connection timeout in the HTTPS request||Contact Us with the X-NWS-LOG-UUID information or submit a ticket for troubleshooting.|
|564||Origin-pull in the HTTPS request failed||If HTTP is configured as the origin-pull protocol, check the load and bandwidth utilization or access limit of the origin server.
If the protocol-follow method is configured, check the port 443 status and certificate configuration of the origin server.
If no error is found in the origin server, contact us with the X-NWS-LOG-UUID information or submit a ticket for troubleshooting.