NGINX Включить CORS для вызова API Google Адресов

Я хотел бы включить CORS для API Google Places, чтобы вызывать его из приложения Ionic 2 с помощью WkWebView.

Я делаю это в своей конфигурации по умолчанию для nginx:

server {
    listen 80 default_server;
    listen [::]:80 default_server;


    root /var/www/html;

    server_name _;

    location / {
    proxy_redirect off;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    # Nginx doesn't support nested If statements, so we
    # concatenate compound conditions on the $cors variable
    # and process later

    # If request comes from allowed subdomain
    # (*.googleapis.com) then we enable CORS
    if ($http_origin ~* (https?://.*\.googleapis\.com(:[0-9]+)?$)) {
       set $cors "1";
    }

    # OPTIONS indicates a CORS pre-flight request
    if ($request_method = 'OPTIONS') {
       set $cors "${cors}o";
    }

    # Append CORS headers to any request from 
    # allowed CORS domain, except OPTIONS
    if ($cors = "1") {
       more_set_headers 'Access-Control-Allow-Origin: $http_origin' always;
       more_set_headers 'Access-Control-Allow-Credentials: true' always;
       proxy_pass      http://111.111.111.111:80;
    }

    # OPTIONS (pre-flight) request from allowed 
    # CORS domain. return response directly
    if ($cors = "1o") {
       more_set_headers 'Access-Control-Allow-Origin: $http_origin';
       more_set_headers 'Access-Control-Allow-Methods: GET, POST, OPTIONS, PUT, DELETE';
       more_set_headers 'Access-Control-Allow-Credentials: true';
       more_set_headers 'Access-Control-Allow-Headers: Origin,Content-Type,Accept';
       add_header Content-Length 0;
       add_header Content-Type text/plain;
       return 204;
    }

    # Requests from non-allowed CORS domains
       proxy_pass      http://111.111.111.111:80;
  }

}

Но я получаю сообщение об ошибке 502 Bad Gateway каждый раз, когда звоню:

http://111.111.111.111/maps/api/place/textsearch/json?key=APIKEY&query=starbucks

Любая помощь, пожалуйста?