WeKnora/frontend/nginx.conf

server {
    listen 80;
    server_name localhost;
    # Default 50M, configured via MAX_FILE_SIZE_MB env var
    client_max_body_size ${MAX_FILE_SIZE};

    # 启用 gzip 压缩静态资源 (前端 index.js 单文件 ~1MB, 不压实测 20s+,
    # 压缩后约 200-300KB, 大陆同地域低带宽机器加载从 25s 降到 3-5s)
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_comp_level 6;
    gzip_proxied any;
    gzip_types text/plain text/css text/javascript application/javascript application/json
               application/xml application/rss+xml image/svg+xml font/ttf font/otf;

    # 安全头配置
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    
    # 错误日志配置
    error_log /var/log/nginx/error.log warn;
    access_log /var/log/nginx/access.log;

    # 前端静态文件
    location / {
        root /usr/share/nginx/html;
        index index.html;
        try_files $uri $uri/ /index.html;

        # index.html 及 SPA fallback 不可缓存，否则前端升级后用户看不到新版本
        add_header Cache-Control "no-cache, must-revalidate" always;
        # nginx add_header 不从上层继承，需要在 location 内重复声明安全头
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    }

    # Vite 构建产物 /assets/* 带 hash 文件名，可长期缓存
    location ^~ /assets/ {
        root /usr/share/nginx/html;

        add_header Cache-Control "public, max-age=31536000, immutable" always;
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    }

    # 本地存储文件代理到后端服务（用于渲染 markdown 中的图片）
    # 精确匹配 /files，避免 Nginx 自动补 / 触发 301
    location = /files {
        proxy_pass ${APP_SCHEME}://${APP_HOST}:${APP_PORT}/files;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    # API请求代理到后端服务
    # APP_SCHEME 默认 http，远程 HTTPS 后端可设为 https
    location /api/ {
        proxy_pass ${APP_SCHEME}://${APP_HOST}:${APP_PORT}/api/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        
        # 连接和重试配置
        proxy_connect_timeout 30s;                 # 连接超时时间
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
        proxy_next_upstream_tries 3;               # 重试次数
        proxy_next_upstream_timeout 30s;           # 重试超时时间
        
        # SSE 相关配置
        proxy_http_version 1.1;                    # 使用 HTTP/1.1
        proxy_set_header Connection "";            # 禁用 Connection: close，保持连接打开
        chunked_transfer_encoding off;             # 关闭分块传输编码
        proxy_buffering off;                       # 关闭缓冲
        proxy_cache off;                           # 关闭缓存
        proxy_read_timeout 3600s;                  # 增加读取超时时间
        proxy_send_timeout 3600s;                  # 增加发送超时时间
    }

    # 错误页面
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }
}