Website is down and Eclipse Status is not reporting a problem

Marketplace.eclipse.org was not reachable by our users this morning. However, Eclipse Status did not notice any downtime.

We believe this is caused by our Nginx proxy server returning a valid cached response if the service is down.

A possible solution would be to query a different URL randomly each time: https://marketplace.eclipse.org?status=:unique_random_string

Nginx will try to fetch the resource from the webserver since it's a new URL even we are still really fetching the homepage. I don't believe this issue is limited to Marketplace or Drupal sites.

Another solution would be to use specific request headers that we already have in place to bypass/revoke the Nginx cache for a particular page/resource.