Http Custom Codes

The following custom HTTP reply codes are used:

• 521 WEB_SERVER_IS_DOWN

  The upstream or the next peer has refused or reset our connection request.

• 522 CONNECTION_TIMED_OUT

  Timeout to connect to upstream or next peer.

• 523 ORIGIN_IS_UNREACHABLE

  For network error, such network unreachable and host unreachable, occurred while connecting to upstream or next peer.

• 525 SSL_HANDSHAKE_FAILED

  Tls handshake with upstream failed.

  Note

  Tls handshake with next proxy peer (it’s not upstream) will generate internal server error instead, as we usually use different tls client config for proxy peers.

• 530 ORIGIN_DNS_ERROR

  Failed to resolve the ip address of upstream or next peer.