Simple nginx config to allow CORS (cross-site) uploads to Amazon S3

nginx_cors_s3_upload_proxy

location / {

    if ($request_method = 'OPTIONS') {
        more_set_headers 'Access-Control-Allow-Origin: *';
        more_set_headers 'Access-Control-Allow-Methods: POST, OPTIONS';
        more_set_headers 'Access-Control-Max-Age: 1728000';
        more_set_headers 'Content-Type: text/plain; charset=UTF-8';

        return 200;
    }

    if ($request_method = 'POST') {
        more_set_headers 'Access-Control-Allow-Origin: *';
        proxy_pass http://your-s3-bucket;
    }
}