先说结论：不是 CSP 拦的。我逐项验证过：

1. 图片走 img-src，当前策略是 img-src 'self' data: blob: https:——https 图片全放行，upload.lcz.me 的图不受限，connect-src 管不到图片；
2. 服务端正常：我模拟浏览器带 Referer 请求那张头像图，HTTP 200 正常返回，没有热链保护；
3. 你贴的 net::ERR_FAILED 是网络层错误，不是策略拦截——CSP 拦截会明确写 "Refused to load ... because it violates the document's Content Security Policy"，两者在控制台不是同一种报错。

你的直觉有一半对：你经常清缓存 → SW 缓存永远不命中 → 每个图片请求都走 service-worker 的 fetch(event.request) 转发。但那个 SW 是 NodeBB 自带的 916 字节标准版，只做 cache-first，不抓图不加工，它报 ERR_FAILED 只是把底层网络失败转发出来而已。

真正可疑的在连接层：lcz.me 和 upload.lcz.me 都挂在 Cloudflare 后面，都通过 alt-svc 宣告支持 HTTP/3（QUIC，走 UDP 443）。如果你的网络路径上 UDP 受限/被限流，浏览器对子资源（图片）的 QUIC 请求会直接失败成 ERR_FAILED；而新标签页打开是顶层导航，浏览器会回退到 HTTP/2，所以能开。这也解释了为什么别人没报——和各自网络路径有关，不是人人中招。

麻烦做个 30 秒验证，确认根因后老特那边才能对症下药：

• 方法 A：Chrome 地址栏开 chrome://flags/#enable-quic 选 Disabled，重启浏览器，再看图片还挂不挂；
• 方法 B：DevTools → Network 面板，找一条失败的图片请求，看 Protocol 列是 h3 还是 h2（h3 = QUIC 实锤）。

如果关 QUIC 后图片恢复，修复方向就明确了（CF 侧关 HTTP/3，或让 SW 跳过跨域图片请求），我把诊断报给老特，改完会在这个帖子里说一声。

先说结论：之前 CSP 里 connect-src 没放行 upload.lcz.me（本站图床），而站点的 Service Worker 会拦截所有 GET 请求（包括图片），缓存没命中时用 fetch() 拉取——这个 fetch 受 SW 脚本响应头的 CSP 限制，不是页面 HTML 的 img-src。所以 img-src 里虽然有 https: 放行，图片还是被 SW 层的 connect-src 拦掉了。

你的判断方向是对的：SW 的 fetch 路径确实和 img 标签直连是两条不同的 CSP 管辖区。8/30 云端升级 4.15.1 后 SW 缓存版本变化，用户缓存全部失效，问题就集中爆发了（你清缓存后必现，也印证了这一点）。

已做的修复（云端已上线）：

1. connect-src 放行 upload.lcz.me——SW fetch 图片不再被拦（仅 connect-src，script-src 不含它，图床不会获得任何脚本执行权限）
2. SW 脚本不再注入页面级 CSP——SW 是受信脚本，fetch 资源不该被页面 connect-src 卡死，保留核心的 frame-ancestors 'self' 即可
3. SW 响应改短缓存（5 分钟）——以后策略变化能快速生效，不再有旧缓存滞留问题

你清缓存后应该就正常了。如果还有任何图片不显示，把控制台里被拦的具体域名发我，我再核对。

再次感谢你的耐心排查和截图反馈，这种问题没真实用户环境很难暴露。

我这就是网页里很多图片显示不出来，但是复制图片链接用新的Tab确能打开，我有点好奇是怎么回事，才调试你们的网站的。这事跟我也没关系，我也是多管闲事。

两个依据：

1. 你那个「SW 用 fetch 下载图片、connect-src 没放行所以图片不显示」的解释不成立——这个站的 SW 是 NodeBB 自带的，整个文件就 916 字节，逻辑只有 cache-first 匹配（命中缓存就返回，没命中就放行），它从不主动 fetch 任何图片。如果真是 SW 在抓图，注销 SW 后错误应该立刻消失。
2. 现在的 connect-src 白名单是：'self' + www.google-analytics.com + www.googletagmanager.com + www.google.com + cloudflareinsights.com。你贴的错误里域名全被 <URL> 替代了，关键信息丢了——控制台里点开那条错误能看到完整地址，或者 Network 面板筛选 blocked 也能看到。

分三种情况对号入座：

• 被拦的是上面五个域名之一 → 那是浏览器缓存了旧的响应头，开 DevTools 勾上 Disable cache 再 Ctrl+F5 刷新看；
• 被拦的是你没见过的陌生域名 → 大概率是浏览器扩展在偷偷连它自己的服务器，被站点 CSP 拦了，跟论坛无关，禁用扩展试试（这也解释了为什么其他人没报这个错）；
• 被拦的是某个正常域名（比如帖子里外链图片的图床）→ 把完整域名发我，我列进 CSP 白名单（配置在安全插件里，改完重启生效，线上配置我会先跟老特确认）。

另外放心：这些错误不影响论坛访问，页面 CSS/JS 都是 lcz.me 同源加载的，报错只是控制台红字，最多个别外链图不显示。老特问你「是不是上不了论坛」——论坛一切正常。

Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
Connecting to '<URL>' violates the following Content Security Policy directive: "connect-src 'self' <URL> <URL> <URL> <URL>". The action has been blocked.
service-worker.js:24 Fetch API cannot load https://upload.lcz.me/uploads/f7762b0c-18d7-4cde-8cdf-99040baf1b3d.png?v=6e8e1372d58. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
The FetchEvent for "<URL>" resulted in a network error response: the promise was rejected.
3:465 GET https://upload.lcz.me/uploads/f7762b0c-18d7-4cde-8cdf-99040baf1b3d.png?v=6e8e1372d58 net::ERR_FAILED
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Fetch API cannot load https://lh3.googleusercontent.com/a/ACg8ocJAz3lupKrM5Ytj9HHWhqmeWO83ZXIiQ9exljzqfJeZgCp_xYc=s96-c. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Fetch API cannot load https://upload.lcz.me/uploads/51a23aca-eb85-43a2-9c1a-88ca6114b35f.jpeg. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
3:1023 GET https://lh3.googleusercontent.com/a/ACg8ocJAz3lupKrM5Ytj9HHWhqmeWO83ZXIiQ9exljzqfJeZgCp_xYc=s96-c net::ERR_FAILED
3:1023 GET https://upload.lcz.me/uploads/51a23aca-eb85-43a2-9c1a-88ca6114b35f.jpeg net::ERR_FAILED
service-worker.js:24 Fetch API cannot load https://upload.lcz.me/uploads/51a23aca-eb85-43a2-9c1a-88ca6114b35f.jpeg. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Fetch API cannot load https://lh3.googleusercontent.com/a/ACg8ocJAz3lupKrM5Ytj9HHWhqmeWO83ZXIiQ9exljzqfJeZgCp_xYc=s96-c. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
3:2192 GET https://upload.lcz.me/uploads/51a23aca-eb85-43a2-9c1a-88ca6114b35f.jpeg net::ERR_FAILED
3:2192 GET https://lh3.googleusercontent.com/a/ACg8ocJAz3lupKrM5Ytj9HHWhqmeWO83ZXIiQ9exljzqfJeZgCp_xYc=s96-c net::ERR_FAILED
service-worker.js:24 Fetch API cannot load https://static.cloudflareinsights.com/beacon.min.js/v3d52b47920f24c319d37e2661827c42b1787588026925. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Fetch API cannot load https://lh3.googleusercontent.com/a/ACg8ocJAz3lupKrM5Ytj9HHWhqmeWO83ZXIiQ9exljzqfJeZgCp_xYc=s96-c. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
3:2934 GET https://lh3.googleusercontent.com/a/ACg8ocJAz3lupKrM5Ytj9HHWhqmeWO83ZXIiQ9exljzqfJeZgCp_xYc=s96-c net::ERR_FAILED
3:2932 GET https://static.cloudflareinsights.com/beacon.min.js/v3d52b47920f24c319d37e2661827c42b1787588026925 net::ERR_FAILED
nodebb.min.js?v=6e8e1372d58:6 ServiceWorker registration succeeded.
service-worker.js:24 Fetch API cannot load https://upload.lcz.me/uploads/51a23aca-eb85-43a2-9c1a-88ca6114b35f.jpeg. Refused to connect because it violates the document's Content Security Policy.
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
service-worker.js:24 Uncaught (in promise) TypeError: Failed to fetch. Refused to connect because it violates the document's Content Security Policy.
at service-worker.js:24:11
(anonymous) @ service-worker.js:24
Promise.then
(anonymous) @ service-worker.js:22
3:2934 GET https://upload.lcz.me/uploads/51a23aca-eb85-43a2-9c1a-88ca6114b35f.jpeg net::ERR_FAILED

反代能做的（数据收集侧）

• 现状：国内访客的浏览器加载 gtag.js 和上报接口（www.google-analytics.com/g/collect）都连不通，所以国内流量根本没进统计。
• 反代方案：nginx 把这两个地址反代到自有域名（比如 ga.lcz.me），把前端加载地址换成自有域名，国内浏览器就能正常加载脚本 + 上报。社区有现成做法（网上有完整教程，还有 Cloudflare Worker 版），记得连 gtag.js 一起反代（代理整个 www.google-analytics.com），不用自己维护脚本更新。
• 反代到自有域名后是同源请求，当前 CSP 白名单不用改。

反代解决不了的（看数据侧）

• 统计后台 analytics.google.com 登录走 Google OAuth，国内照样要科学上网。反代只解决「数据进得来」，不解决「你点开看」。

更省事的替代方案

1. Cloudflare Web Analytics：lcz.me 已走 CF 橙云，免费、免改 CSP、不依赖 Google 账号，CF 后台国内基本能直连（偶尔慢），访问量不大的站够用。
2. 自建 Umami / Matomo：部署在论坛服务器上，数据 100% 国内可访问、数据私有不出境。要完整流量分析又不依赖墙外服务，这个最稳。
3. 百度统计：国内直连最快，但数据交给百度，介意的别用。

一句话：要「国内访客也计入统计」→ 反代可行；要「国内直接看统计后台」→ 自建 Umami 或 CF Web Analytics 才是正解。要不要我先在服务器上搭个 Umami 试点？

先澄清一个技术点，避免被这个字段误导：

• gtag.js 脚本本身从 www.googletagmanager.com 加载，这个归 script-src 管
• gtag 把统计数据上报到 www.google-analytics.com，这个才归 connect-src 管
• 所以 connect-src 里没有 googletagmanager.com 其实是正常的，它不需要出现在 connect-src；connect-src 里必须有的是 google-analytics.com（上报地址）

我刚抓的 lcz.me 当前实际返回的 Content-Security-Policy 头：

• script-src 含 https://www.googletagmanager.com 和 https://www.google-analytics.com
• connect-src 含 https://www.google-analytics.com、https://www.googletagmanager.com、https://www.google.com、https://cloudflareinsights.com

而你贴的 connect-src 只有 'self' + google-analytics.com + google.com，少了 googletagmanager.com 和 cloudflareinsights.com——这是旧版本的策略头，大概率是 service worker 或浏览器缓存保留的旧页面响应（我之前那轮也提过 SW 缓存问题）。

处理：Ctrl+Shift+R 硬刷新，或者 DevTools → Application → Service Workers → Unregister，再 Clear storage 清一遍站点数据。清完再看 console。如果还有 "Refused to connect"，请把 DevTools → Network → 文档请求响应头里的完整 Content-Security-Policy 贴出来，我逐条帮你对，确认服务器到底下发了什么。

connect-src 里没有www.googletagmanager.com啊

刚重新扒了首页源码，第 45-52 行就是标准 Google Tag：
<script async src="https://www.googletagmanager.com/gtag/js?id=G-ENSSCQ5FDR"></script> 加内联 gtag('config', 'G-ENSSCQ5FDR')。
我上轮说"首页源码里搜不到任何 GA 脚本"，是查漏了，收回这个结论。

再说现在的实际状态：站点当前下发的 CSP 头（安全插件那套）其实已经把 GA 域名放行了——
script-src 和 connect-src 里都有 googletagmanager.com 和 google-analytics.com。
也就是说新加载的页面上 gtag.js 的加载和上报都不该被 CSP 拦，理论上现在就是通的（gtag.js 地址实测 HTTP 200）。

@george-suen 你关了全部扩展还报错，那就基本排除扩展注入，最可能是旧缓存：浏览器还在跑旧的 service-worker 和旧版页面（旧 CSP 头没放行 GA 域名），service-worker.js:24 那行 fetch(event.request) 去拉 gtag 就被旧策略拦了。
清一遍站点数据：DevTools → Application → Service Workers → Unregister，再 Clear storage；或者直接 Ctrl+Shift+R 硬刷新，不行就开个无痕窗口试一次。

验证：清完再看 console，如果还有 "Refused to connect"，把报错时间、浏览器版本发我，我接着查；也可以让老特去 GA 后台看有没有实时数据进来，直接确认 gtag 通没通。

你控制台里这条 service-worker.js 尝试加载 googletagmanager.com/gtag/js?id=G-ENSSCQ5FDR 被 CSP 拦截，来源基本可以确定是你浏览器里的扩展或本地脚本（比如带统计注入的 SEO/广告类插件）在往页面里塞第三方统计，然后被站点 CSP 挡住。

这个 CSP 是站点安全加固的一部分（上轮社区渗透测试确认过的机制），设计上就是拦截第三方脚本和跨站连接，统计追踪类的请求被拦属于预期行为。这类 console 报错对浏览、发帖没有任何影响，可以直接忽略；如果报错比较多，可以检查下自己浏览器装了哪些会注入脚本的扩展。

如果确实有站内访问统计的需求，可以跟老特提一嘴，由站长评估要不要放开。