server {
    listen 80;
    server_name _;
    client_max_body_size 500M; 
    resolver 127.0.0.11 valid=10s ipv6=off;
    sendfile on;
    tcp_nopush on;
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_comp_level 5;
    gzip_types
        text/plain
        text/css
        text/xml
        application/json
        application/javascript
        application/x-javascript
        application/xml
        application/xml+rss
        image/svg+xml;
    
    root /usr/share/nginx/html;
    index index.html;

    location = /index.html {
        add_header Cache-Control "no-cache";
    }

    location /assets/ {
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    # 前端 SPA 路由（刷新不 404）
    location / {
        try_files $uri $uri/ /index.html;
    }

    # SSE 流式对话：禁用代理缓冲，避免一次性攒包后才返回
    location = /api/task-build/dialog/chat/stream {
        set $backend_upstream http://backend:8080;
        proxy_pass $backend_upstream;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
        proxy_buffering off;
        proxy_cache off;
        chunked_transfer_encoding on;
        add_header X-Accel-Buffering no;
    }

    # 代理 REST API 到后端
    location /api/ {
        set $backend_upstream http://backend:8080;
        proxy_pass $backend_upstream;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_read_timeout 300s;
    }

    # 代理 WebSocket（SSH 终端）
    location /ws {
        set $backend_upstream http://backend:8080;
        proxy_pass $backend_upstream;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_read_timeout 3600s;
    }
}