async

There are two options for calculating the map:

• 0 = Calculate the map immediately (default)

With this option, the connection is maintained until the map has been generated; this can take several minutes.

• 1 = Calculate the map in the background

With this option, a link is provided which can be used to call up the map at a later time.
If the map is not yet available, error 404 is returned and informations in XML are provided.