From 7de1f70905ded1dd24e2470a77d37ffb4c84a234 Mon Sep 17 00:00:00 2001
From: opsx-tools <opsx@tools.com>
Date: Thu, 23 Jul 2026 12:59:11 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E9=9D=99=E6=80=81=E8=B5=84=E6=BA=90=20C?=
 =?UTF-8?q?ache-Control=20=E9=98=B2=E6=AD=A2=E6=B5=8F=E8=A7=88=E5=99=A8?=
 =?UTF-8?q?=E7=BC=93=E5=AD=98=E6=97=A7=20index.html=20=E5=AF=BC=E8=87=B4?=
 =?UTF-8?q?=E7=99=BD=E5=B1=8F?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- assets/* 设为 immutable 长期缓存（文件名含 hash，内容变更即换名）
- index.html 和 SPA fallback 设为 no-cache（每次重新验证）
- 彻底解决 MIME type 错误白屏问题
---
 backend/main.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/backend/main.go b/backend/main.go
index 3d8a34a..1cfce1b 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -78,10 +78,17 @@ func main() {
 		}
 		if f, err := dist.Open(path); err == nil {
 			f.Close()
+			// 带 hash 的静态资源（assets/*）可长期缓存；index.html 必须每次重新验证
+			if strings.HasPrefix(path, "assets/") {
+				c.Header("Cache-Control", "public, max-age=31536000, immutable")
+			} else {
+				c.Header("Cache-Control", "no-cache")
+			}
 			fileServer.ServeHTTP(c.Writer, c.Request)
 			return
 		}
-		// SPA fallback
+		// SPA fallback — 必须 no-cache，否则浏览器缓存旧 index.html 会白屏
+		c.Header("Cache-Control", "no-cache")
 		c.Request.URL.Path = "/"
 		fileServer.ServeHTTP(c.Writer, c.Request)
 	})