# 该模板会由容器启动时自动生成配置并渲染变量 ${BACKEND_HOST} ${BACKEND_PORT}
server {
    listen       80;
    server_name  _;

    root   /usr/share/nginx/html;
    index  index.html;

    # 开启压缩，减小传输体积
    gzip on;
    gzip_min_length 1k;
    gzip_types text/plain text/css application/javascript application/json image/svg+xml;

    client_max_body_size 20m;

    # 单页应用（SPA）history 路由：找不到对应文件时回退到 index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # 静态资源加缓存
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2?|ttf)$ {
        expires 7d;
        access_log off;
    }

    # 反向代理后端接口（覆盖本项目后端的所有路由前缀）
    # 使用变量形式，后端容器没启动时 nginx 也能正常启动，只是请求会返回 502
    location ~ ^/(api|advisors|c_lass|docs|redoc|openapi\.json) {
        resolver 127.0.0.11 valid=30s;          # Docker 内嵌 DNS
        set $ss_backend http://${BACKEND_HOST}:${BACKEND_PORT};
        proxy_pass $ss_backend;          # 变量形式必须省略 URI 部分，原始请求路径会原样透传

        proxy_http_version 1.1;
        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;
    }

    access_log /var/log/nginx/frontend_access.log;
    error_log  /var/log/nginx/frontend_error.log;
}