From e00916cb398f2604aef5f1039cbf555b3ce62951 Mon Sep 17 00:00:00 2001
From: Gerhard Tan <gwohau.tan@gmail.com>
Date: Fri, 16 Feb 2024 12:12:15 +0800
Subject: [PATCH] fix nil map error when using plugin headers in legacy format

---
 pkg/config/legacy/conversion.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkg/config/legacy/conversion.go b/pkg/config/legacy/conversion.go
index 0892e4f2..45ba2c4f 100644
--- a/pkg/config/legacy/conversion.go
+++ b/pkg/config/legacy/conversion.go
@@ -170,14 +170,18 @@ func Convert_ServerCommonConf_To_v1(conf *ServerCommonConf) *v1.ServerConfig {
 
 func transformHeadersFromPluginParams(params map[string]string) v1.HeaderOperations {
 	out := v1.HeaderOperations{}
+	set := make(map[string]string)
 	for k, v := range params {
 		if !strings.HasPrefix(k, "plugin_header_") {
 			continue
 		}
 		if k = strings.TrimPrefix(k, "plugin_header_"); k != "" {
-			out.Set[k] = v
+			set[k] = v
 		}
 	}
+	if len(set) > 0 {
+		out.Set = set
+	}
 	return out
 }