Nginx: Request Entity Too Large

Solution: In server block, add "client_max_body_size" directive like the following

1server {
2    listen 8080;
3    client_max_body_size 100M;
4...
5...
6}

See details in https://www.cyberciti.biz/faq/linux-unix-bsd-nginx-413-request-entity-too-large/