server {
    listen 80 default_server;
    root /usr/share/nginx/html;

    location / {
        set $json 0;
        if ($uri ~* "^/v1/") { set $json 1; }
        if ($http_accept ~* "application/json") { set $json 1; }

        if ($json = 1) {
            default_type application/json;
            return 503 '{"error":"Service Unavailable","message":"EventHub is temporarily unavailable. Please try again later."}';
        }

        return 503;
    }

    error_page 503 /503.html;
    location = /503.html {
        internal;
    }
}