Почему nginx возвращает 403?

upstream api_data {
  server 127.0.0.1:7777;
}

server {
  listen 80;

  server_name example.com;

  location / {
    proxy_pass http://api_data/;
#    client_max_body_size 50M;
  }

  location /static/ {
    alias /home/vasya/api-cms-server/public/uploads/;
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }
}