Http Custom Headers

Chained Final Info Headers

These headers are neither reset nor appended by intermediate proxies. This means their values always come from the proxy closest to the final upstream.

X-VEY-Upstream-Id

If this header is present, the response came from a remote peer. The value is the corresponding server_id.

If this header appears in an error response, it indicates that the response was generated by the server after the one identified by the same server_id. That may be either the final upstream server or another proxy in the chain.

This header is controlled by http_proxy server option http_forward_mark_upstream.

X-VEY-Upstream-Addr

If present, this header contains the remote address that the outermost proxy in the chain is trying to connect to.

This header is controlled by http_proxy server option echo_chained_info.

X-VEY-Outgoing-Ip

If present, this header contains the local bind IP used by the outermost proxy in the chain when connecting to the remote peer.

This header is controlled by http_proxy server option echo_chained_info.

Local Info Headers

Each proxy in the chain appends its own value. Values closer to the upstream appear first.

X-VEY-Remote-Connection-Info

The value format:

<server_id>[; bind=<bind_ip>][; remote=<remote_addr>][; local=<local_addr>][; expire=<expire_rfc3339>]

  • bind_ip

    The IP address selected for binding before the connection is established.

  • remote_addr

    The remote socket address selected before the connection is established.

  • local_addr

    The local socket address actually bound after the connection is established.

  • expire_rfc3339

    The expiration time of the remote peer. This field is not set when the remote side is the final upstream target.

This header is controlled by http_proxy server option server_id.

X-VEY-Dynamic-Egress-Info

The value format:

<server_id>[; isp=<isp>][; ip=<ip>][; area=<area>]

  • isp

    ISP information for the egress IP address.

  • ip

    The externally visible egress IP address.

  • area

    Geographic area associated with the egress IP address. The format is a /-separated string, for example 中国/山东/济南.