Timeout for WPS requests

[matthesrieke]

There are two request types against WPS instances. These are the only locations where an external web service is called. These might not be under fully control all the time and might be offline or slow.

Implement timeout for these requests. Possible add a caching mechanism to preserve previous responses.

enviroCar-www/assets/includes/tracks.php

Line 21 in e4c23de

$response = get_request(get_wps_tracks(), false);

enviroCar-www/assets/includes/fuelprices.php

Line 22 in e4c23de

$response = get_request(get_wps_fuel_price().rawurlencode($_GET['fuelType']));