# Challenge nginx configuration.

upstream backend_drain {
    server localhost:<%= @data["challenge"]["drain_port"] %> max_fails=3;
}

server {
    server_name localhost;
    listen <%= @data["challenge"]["port"] %>;
    # Reference https://devcenter.heroku.com/articles/private-space-logging#requests
    # > the maximum Private Space Logging request could be as large as 5000 KB
    # Add a little for good measure.
    client_body_buffer_size 6m;
    client_max_body_size 6m;

    location / {
        proxy_connect_timeout 12s;
        proxy_read_timeout 6s;
        proxy_next_upstream_tries 3;

        proxy_pass http://backend_drain;

        # Inform clients that we want them to re-open connections.
        # Otherwise, the Heroku router likes to keep very long-running sessions.
        # Note that this requires an internal Heroku feature flag at the time of writing:
        #   spaces-forward-connection-close
        # If the flag is not set, the Heroku router will *not* forward this header to clients.
        add_header Connection close always;
    }

    location ^~ /.well-known/fastly/logging/challenge {
      return 200 "<%= @data["challenge"]["response"].split(",").join("\n") %>";
    }
}