http {
    # 传统单行日志
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    # json格式日志，便于传输至ES分析
    log_format main_json escape=json
      '{'
        # 基础访问信息
        '"@timestamp": "$time_iso8601",'
        '"time_local": "$time_local",'
        '"remote_addr": "$remote_addr",'
        '"remote_user": "$remote_user",'
        '"request": "$request",'
        '"request_method": "$request_method",'
        '"request_uri": "$request_uri",'
        '"request_length": "$request_length",'
        '"args": "$args",'
        '"query_string": "$query_string",'
        '"http_protocol": "$server_protocol",'
        '"http_version": "$http_version",'

        # 响应信息
        '"status": "$status",'
        '"body_bytes_sent": "$body_bytes_sent",'
        '"bytes_sent": "$bytes_sent",'
        '"content_type": "$content_type",'
        '"content_length": "$content_length",'

        # 性能监控
        '"request_time": "$request_time",'
        '"upstream_response_time": "$upstream_response_time",'
        '"upstream_connect_time": "$upstream_connect_time",'
        '"upstream_header_time": "$upstream_header_time",'
        '"connection_time": "$connection_time",'
        '"pipe": "$pipe",'

        # 连接信息
        '"connection": "$connection",'
        '"connection_requests": "$connection_requests",'
        '"upstream_addr": "$upstream_addr",'
        '"upstream_status": "$upstream_status",'
        '"upstream_cache_status": "$upstream_cache_status",'

        # HTTP头信息
        '"http_referer": "$http_referer",'
        '"http_user_agent": "$http_user_agent",'
        '"http_x_forwarded_for": "$http_x_forwarded_for",'
        '"http_x_real_ip": "$http_x_real_ip",'
        '"http_x_forwarded_proto": "$http_x_forwarded_proto",'
        '"http_x_forwarded_host": "$http_x_forwarded_host",'
        '"http_accept": "$http_accept",'
        '"http_accept_encoding": "$http_accept_encoding",'
        '"http_accept_language": "$http_accept_language",'
        '"http_connection": "$http_connection",'
        '"http_cookie": "$http_cookie",'
        '"http_authorization": "$http_authorization",'

        # 服务器信息
        '"host": "$host",'
        '"http_host": "$http_host",'
        '"server_name": "$server_name",'
        '"server_addr": "$server_addr",'
        '"server_port": "$server_port",'
        '"scheme": "$scheme",'

        # 地理位置信息（需要安装geoip模块）
        '"geoip_country_code": "$geoip_country_code",'
        '"geoip_country_name": "$geoip_country_name",'
        '"geoip_region": "$geoip_region",'
        '"geoip_city": "$geoip_city",'
        '"geoip_latitude": "$geoip_latitude",'
        '"geoip_longitude": "$geoip_longitude",'

        # 缓存信息
        '"cache_status": "$upstream_cache_status",'
        '"cache_control": "$upstream_http_cache_control",'
        '"expires": "$upstream_http_expires",'

        # 安全相关（需要SSL配置）
        '"ssl_protocol": "$ssl_protocol",'
        '"ssl_cipher": "$ssl_cipher",'
        '"ssl_client_verify": "$ssl_client_verify",'
        '"ssl_client_s_dn": "$ssl_client_s_dn",'

        # 自定义字段
        '"request_id": "$request_id",'
        '"msec": "$msec",'
        '"nginx_version": "$nginx_version"'
      '}';

    access_log  /var/log/nginx/access.log  main_json;
}