Nginx configuration for AngularJS cloud project with Apiary

nginx
server {
  listen 80;
  server_name ~^(?:(?!www)(?!api)(?!tests))(.*)\.example\.dev$;
  access_log /tmp/subdomains.example.dev.log;
  error_log  /tmp/subdomains.example.dev.error.log;
 
  client_max_body_size 100M;
 
  location / {
    add_header 'Access-Control-Allow-Origin' '*';
    root '/ABSOLUTE_PATH_TO_WORKING_DIR/example-subdomain-frontend/build';
    try_files $uri $uri/ /index.html =404;
  }
}
 
server {
  listen 80;
  server_name www.example.dev;
  return 301 $scheme://exampe.dev$request_uri;
}
 
server {
  listen 80;
  server_name example.dev;
  access_log /tmp/example.dev.log;
  error_log  /tmp/example.dev.error.log;
 
  client_max_body_size 100M;
 
  location / {
    add_header 'Access-Control-Allow-Origin' '*';
    root '/ABSOLUTE_PATH_TO_WORKING_DIR/example-domain-frontend/build';
    try_files $uri $uri/ /index.html =404;
  }
}
 
server {
  listen 80;
  server_name api.example.dev;
 
  access_log /tmp/api.example.dev.log;
  error_log  /tmp/api.example.dev.error.log;
 
  location / {
    add_header 'Access-Control-Allow-Credentials' 'true';
    add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
    add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
 
    proxy_pass http://private-ABCDE-example.apiary-mock.com;
  }
}
 
 
server {
  listen 80;
  server_name tests.example.dev;
 
  client_max_body_size 100M;
 
  root "/ABSOLUTE_PATH_TO_WORKING_DIR/example-subdomain-frontend/tests/test-coverage/PhantomJS 2.1.1 (Mac OS X 0.0.0)";
}