Use getServerName() instead of getHeader(Host) for original host resolution

Shipped: March 29, 2026 at 5:03 AM UTC
Author: Kamo
Commit: 17b84fc

ForwardedHeaderFilter consumes X-Forwarded-Host and adapts getServerName() accordingly, while getHeader(Host) returns the raw HTTP Host which may be a K8s internal URL when using internal service routing.

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