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feat(route): add support for relaying PROXY protocol header to TCP upstreams

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Add `relay_proxy_protocol_header` configuration option for TCP routes that enables
forwarding the original client IP address to upstream services via PROXY protocol
v2 headers. This feature is only available for TCP routes and includes validation
to prevent misuse on UDP routes.

- Add RelayProxyProtocolHeader field to Route struct with JSON tag
- Implement writeProxyProtocolHeader in stream package to craft v2 headers
- Update TCPTCPStream to conditionally send PROXY header to upstream
- Add validation ensuring feature is TCP-only
- Include tests for both enabled/disabled states and incoming proxy header relay
This commit is contained in:
yusing
2026-03-10 12:03:29 +08:00
parent 41de86de75
commit 93263eedbf
10 changed files with 250 additions and 12 deletions
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config.example.yml
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@@ -52,6 +52,9 @@ entrypoint:
# Note that HTTP/3 with proxy protocol is not supported yet.
support_proxy_protocol: false
# To relay the client address to a TCP upstream, enable `relay_proxy_protocol_header: true`
# on that specific TCP route. UDP relay is not supported yet.
# Below define an example of middleware config
# 1. set security headers
# 2. block non local IP connections