support exposing proxy protocol enabled listeners#975
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Co-authored-by: GPT-5.4
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Co-authored-by: GPT-5.4
These changes add configurable nginx realip settings and proxy protocol listener support for APISIX. This enables deployments behind L4/L7 proxies to preserve the original client IP end to end, including cases where the proxy sends PROXY protocol metadata.
The change introduces:
Backwards compatibility is preserved: all new settings are optional, and existing rendered templates are unchanged unless these values are set.
Operational note: when using proxy protocol, operators should set real_ip_header to proxy_protocol, configure trusted proxy CIDRs in real_ip_from, and ensure the external load balancer actually sends PROXY protocol to the exposed listener ports.