From cd2662b349bcece1f6b7d885426ad5d4c0d75ca8 Mon Sep 17 00:00:00 2001
From: Yuzhong Zhang <141388234+BetterAndBetterII@users.noreply.github.com>
Date: Wed, 9 Jul 2025 13:44:27 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=E4=B8=BB=E6=9C=BA=E5=9C=B0?=
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---
 main.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/main.go b/main.go
index 298b489..ace7ab3 100644
--- a/main.go
+++ b/main.go
@@ -87,7 +87,12 @@ func handleUI() http.HandlerFunc {
 			return
 		}
 
-		modifiedContent := strings.ReplaceAll(string(fileContent), "firestore.googleapis.com", "localhost:3002")
+		// 替换为请求的url对应的domain，使其在反向代理或不同域名下也能正常工作。
+		backendHost := os.Getenv("EXCALIDRAW_BACKEND_HOST")
+		if backendHost == "" {
+			backendHost = r.Host
+		}
+		modifiedContent := strings.ReplaceAll(string(fileContent), "firestore.googleapis.com", backendHost)
 		modifiedContent = strings.ReplaceAll(modifiedContent, "ssl=!0", "ssl=0")
 		modifiedContent = strings.ReplaceAll(modifiedContent, "ssl:!0", "ssl:0")