想用nginx做反向代理，代理上游为nodeJS程序，如果想要配置静态资源combo服务应该要怎样

配置如下：

情况一
配置：

server { listen 5555; server_name 172.16.42.97; location ~ .*\.(html|htm|gif|jpg|jpeg|bmp|png|ico|txt|js|css)$ { root /usr/local/nginx/html; index index.html; concat on; concat_max_files 20; concat_unique on; concat_types "application/javascript" "text/css"; } location / { proxy_pass http://172.16.42.97:4000/; } }

报错502。

情况二
配置：

server { listen 5555; server_name 172.16.42.97; location ~ .*\.(html|htm|gif|jpg|jpeg|bmp|png|ico|txt|js|css)$ { root /usr/local/nginx/html; index index.html; concat on; concat_max_files 20; concat_unique on; concat_types "application/javascript" "text/css"; } }

报错Uncaught SyntaxError: Unexpected token <
combo合成失败

情况三
配置：

server { listen 5555; server_name 172.16.42.97; location / { root /usr/local/nginx/html; index index.html; concat on; concat_max_files 20; concat_unique on; concat_types "application/javascript" "text/css"; }

正常没问题。

location / { proxy_pass http://172.16.42.97:4000/; }

server { listen 80; server_name localhost; access_log /www/logs/www.log; location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$ { root /www/html/public; expires 30d; } location ~ .*\.(js|css)?$ { root /www/html/public; expires 1h; } location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; #proxy_set_header X-Nginx-Proxy true; proxy_set_header Connection ""; proxy_pass http://localhost:3002; } }