Nginx 413 Request Entity Too Large

I got Nginx error 403: Request entity too large. How do I fix this problem and allow file upload upto 2MB in size?

    # vi /usr/local/nginx/conf/nginx.conf

Add client_max_body_size in http section

    http {      ....      client_max_body_size 2M;      ....  }

Save and close the file. Reload the nginx

    # /usr/local/nginx/sbin/nginx -s reload

source: http://www.lifelinux.com/nginx-413-request-entity-too-large/