Empty tiles are not generated by Tilestream

[Daniele Viganò]

When requesting a tile with empty data the Tilestream server throw an HTTP 404 error instead of serving an empty tile.

Example: http://tilestream.openquake.org/v2/hazard-map-points-world/3/3/4.png

[Daniele Viganò (daniele-vigano)]

For the moment we fixed the issue intercepting the 404 error on the reverse proxy and serving an empty tile (blank png) directly from the Nginx server using proxy_intercept_errors on; and error_page 404 /blank.png;

server {
        listen 80;

        server_name tilestream.openquake.org;

        location / {
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $host;
                proxy_pass http://127.0.0.1:8000/;
                proxy_intercept_errors on;
        }

        location ~* \.mbtiles { deny all; access_log off; log_not_found off; }

        error_page 404 /blank.png;
        location = /blank.png {
                root /var/www;
        }

        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /usr/share/nginx/html;
        }

}

[Daniele Viganò (daniele-vigano)]

Fixed server-side not a platform bug.