125 lines
4.2 KiB
Markdown
125 lines
4.2 KiB
Markdown
# Cloudflare 免费版缓存配置
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目标：让 Cloudflare 承担公开页面、公开 API 和静态资源的重复读取，降低 VPS CPU、Next.js worker 和后端 detail-batch 压力，同时避免缓存账户、支付、反馈和实时连接。
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代码已通过 `Cache-Control` 与 `Cloudflare-CDN-Cache-Control` 声明 TTL。Cloudflare Dashboard 应设置为尊重源站缓存头，不要给所有 `/api/*` 统一启用 Cache Everything。
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缓存规则只允许作用于前端域名 `polyweather.top`。`api.polyweather.top` 是带服务令牌和会员校验的后端源站，必须绕过 Cloudflare 缓存，避免缓存命中绕过后端权限检查。
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## 基础设置
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- `Caching > Configuration > Browser Cache TTL`：Respect Existing Headers
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- `Caching > Configuration > Development Mode`：Off
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- `Caching > Configuration > Always Online`：On
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- `Caching > Tiered Cache`：Smart Tiered Cache，若当前免费套餐控制台提供则开启
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- `Speed > Optimization > Content Optimization > Brotli`：On
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- `Speed > Optimization > Content Optimization > Early Hints`：On
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- `Network > HTTP/3 (with QUIC)`：On
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- `Network > WebSockets`：On
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- 确保 `api.polyweather.top` 与 `polyweather.top` 代理状态为 Proxied
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## Cache Rules
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按以下顺序创建，绕过规则必须放在公开缓存规则之前。免费版规则数量有限，因此使用路径集合合并表达式。
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### 1. 绕过后端域名、动态和敏感请求
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动作：Bypass cache
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表达式：
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```text
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http.host eq "api.polyweather.top"
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or (http.request.method ne "GET" and http.request.method ne "HEAD")
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or starts_with(http.request.uri.path, "/api/auth/")
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or starts_with(http.request.uri.path, "/api/feedback")
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or starts_with(http.request.uri.path, "/api/events")
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or starts_with(http.request.uri.path, "/api/internal/")
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or starts_with(http.request.uri.path, "/api/ops/")
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or starts_with(http.request.uri.path, "/api/payments/")
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or starts_with(http.request.uri.path, "/account")
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or starts_with(http.request.uri.path, "/auth")
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or starts_with(http.request.uri.path, "/ops")
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or starts_with(http.request.uri.path, "/terminal")
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or http.request.uri.query contains "force_refresh=true"
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```
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若 Dashboard 支持请求头或 Cookie 条件，再加入：
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```text
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or any(http.request.headers["authorization"][*] ne "")
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or http.cookie contains "sb-"
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```
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### 2. 缓存静态资源
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动作：Eligible for cache；Edge TTL 使用源站 Cache-Control。
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表达式：
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```text
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http.host eq "polyweather.top"
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and (
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starts_with(http.request.uri.path, "/_next/static/")
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or lower(http.request.uri.path.extension) in {
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"js" "css" "woff" "woff2" "png" "jpg" "jpeg" "webp" "avif" "svg" "ico"
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}
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)
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```
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源站 TTL：一年 immutable。
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### 3. 缓存公开页面
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动作：Eligible for cache；Edge TTL 使用源站 Cache-Control。
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表达式：
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```text
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http.host eq "polyweather.top"
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and (
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http.request.uri.path eq "/"
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or starts_with(http.request.uri.path, "/docs/")
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or starts_with(http.request.uri.path, "/modern/")
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or starts_with(http.request.uri.path, "/probabilities/")
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or starts_with(http.request.uri.path, "/subscription-help/")
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)
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```
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源站 TTL：10 分钟，过期后允许后台刷新 1 小时。
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### 4. 缓存公开数据接口
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动作：Eligible for cache；Edge TTL 使用源站 Cache-Control。
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表达式：
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```text
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http.host eq "polyweather.top"
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and (
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http.request.uri.path eq "/api/cities"
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or http.request.uri.path eq "/api/cities/detail-batch"
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or starts_with(http.request.uri.path, "/api/city/")
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or http.request.uri.path eq "/api/scan/terminal"
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or http.request.uri.path eq "/api/system/status"
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)
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```
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接口 TTL：
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- `/api/cities`：5 分钟，过期后可复用 1 小时。
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- 城市详情与 detail-batch：60 秒，过期后可复用 5 分钟。
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- `/api/scan/terminal`：5 分钟，过期后可复用 15 分钟。
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- partial、busy、timeout、stale、force refresh 和错误响应：`no-store`，不得缓存。
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## 验证
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每次规则变更后连续请求同一 URL，检查响应头：
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```powershell
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curl.exe -sS -D - -o NUL "https://polyweather.top/api/cities"
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curl.exe -sS -D - -o NUL "https://polyweather.top/api/scan/terminal?limit=1"
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```
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正常命中应看到 `CF-Cache-Status: HIT` 和递增的 `Age`。首次请求通常是 `MISS`；动态或明确 `no-store` 的请求应保持 `DYNAMIC` 或 `BYPASS`。
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