[openstreetmap/openstreetmap-website] Directions error: router.project-osrm.org returns 504 (#1263)

[Mikkel Kirkgaard Nielsen]

The directions functionality on the main map is broken.

Inputting a starting (Esbjerg, Denmark) and destination (Copenhagen, Denmark) point will load  http://www.openstreetmap.org/directions?engine=osrm_car&route=55.466%2C8.452%3B55.687%2C12.570 which result in a routing error: "Couldn't find a route between those two places." message, and in the browser console I see a  error;

Firefox 47.0 (Ubuntu 15.10):
> 17:34:47.325 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://router.project-osrm.org/route/v1/driving/8.452,55.466;12.57,55.687?overview=false&geometries=polyline&steps=true. (Reason: CORS header 'Access-Control-Allow-Origin' missing).1 (unknown)

Chromium 51.0.2704.79 (Ubuntu 15.10):
> http://router.project-osrm.org/route/v1/driving/8.452,55.466;12.57,55.687?overview=false&geometries=polyline&steps=true Failed to load resource: the server responded with a status of 504 (GATEWAY_TIMEOUT)
> XMLHttpRequest cannot load http://router.project-osrm.org/route/v1/driving/8.452,55.466;12.57,55.687?overview=false&geometries=polyline&steps=true. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://www.openstreetmap.org' is therefore not allowed access. The response had HTTP status code 504.

Internet Explorer 11.0.9600.18376 (Windows Server 2008 R2 Standard)
>SEC7120: Origin http://www.openstreetmap.org not found in Access-Control-Allow-Origin header.
>File: directions
>SCRIPT7002: XMLHttpRequest: Network Error 0x80070005, Access is denied.
>File: directions

A manual request however shows, as Chromium is aware, that the router.project-osrm.org API returns status code 504:

> $ wget -S -O- "http://router.project-osrm.org/route/v1/driving/8.452,55.466;12.57,55.687?overview=false&geometries=polyline&steps=true"
--2016-08-08 17:52:51--  http://router.project-osrm.org/route/v1/driving/8.452,55.466;12.57,55.687?overview=false&geometries=polyline&steps=true
Resolving router.project-osrm.org (router.project-osrm.org)... 52.21.213.38
Connecting to router.project-osrm.org (router.project-osrm.org)|52.21.213.38|:80... connected.
HTTP request sent, awaiting response... 
  HTTP/1.1 504 GATEWAY_TIMEOUT
  Date: Mon, 08 Aug 2016 15:53:06 GMT
  Server: nginx/1.4.6 (Ubuntu)
  Content-Length: 0
  Connection: keep-alive
Retrying.
....


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