From c93194e6be33533ae7ef9367a94581be9fbcd0de Mon Sep 17 00:00:00 2001
From: water <672684719@qq.com>
Date: Wed, 29 Jul 2026 08:45:14 +0800
Subject: [PATCH] fix: support non-standard X-Forwarded-For formats (bracketed
 IPv6, port suffix)

---
 gin.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gin.go b/gin.go
index 2e033bf3..77bfac15 100644
--- a/gin.go
+++ b/gin.go
@@ -486,7 +486,13 @@ func (engine *Engine) validateHeader(header string) (clientIP string, valid bool
 	items := strings.Split(header, ",")
 	for i := len(items) - 1; i >= 0; i-- {
 		ipStr := strings.TrimSpace(items[i])
-		ip := net.ParseIP(ipStr)
+		// Handle formats like "[::1]:port", "1.2.3.4:port", and "[::1]"
+		host, _, err := net.SplitHostPort(ipStr)
+		if err != nil {
+			// No port present; strip brackets if present (e.g. "[::1]")
+			host = strings.Trim(ipStr, "[]")
+		}
+		ip := net.ParseIP(host)
 		if ip == nil {
 			break
 		}