用nginx配置node的程序，已经改了conf的配置，用域名无法访问？

Question

我用pm2运行了一个node的示例程序（express的示例程序），目前可以用http://127.0.0.1:3000打开，现在我想用自己自定义的域名打开，但是我用nginx配置之后还是不能用自定义域名(http://mydomain.com)打开，用127.0.0.1或localhost是可以的，是不是还要在本机配置host呢？但是在网上找了一圈nginx配置经验或说明没有一个说还要改host，希望能有人解答。附上nginx.conf的配置信息#usernobody;worker_processes1;#error_loglogs/error.log;#error_loglogs/error.lognotice;#error_loglogs/error.loginfo;#pidlogs/nginx.pid;events{worker_connections1024;}http{includemime.types;default_typeapplication/octet-stream;#log_formatmain'$remote_addr-$remote_user[$time_local]"$request"'#'$status$body_bytes_sent"$http_referer"'#'"$http_user_agent""$http_x_forwarded_for"';#access_loglogs/access.logmain;sendfileon;#tcp_nopushon;#keepalive_timeout0;keepalive_timeout65;#gzipon;upstreamnodejs{server127.0.0.1:3000;}server{listen80;server_namewww.mydomain.commydomain.com;#charsetkoi8-r;#access_loglogs/host.access.logmain;location/{proxy_set_headerX-Real-IP$remote_addr;proxy_set_headerX-Forwarded-For$proxy_add_x_forwarded_for;proxy_set_headerHost$http_host;proxy_set_headerX-Nginx-Proxytrue;proxy_set_headerConnection"";proxy_passhttp://nodejs;#roothtml;#indexindex.htmlindex.htm;}#error_page404/404.html;#redirectservererrorpagestothestaticpage/50x.html#error_page500502503504/50x.html;location=/50x.html{roothtml;}}includeservers/*;}