anchor.diff:      "paper_size": "Din A1"
   }
   --XXXXXXXX
  -Content-Disposition: form-data; name="track"; filename="test.gpx"
  +Content-Disposition: form-data; name="file1"; filename="test.gpx"
   Content-Type: application/gpx+xml
   
   <?xml version="1.0" encoding="UTF-8"?>
  
positive.code: layout:: Map layout to use (default: "plain")
  style:: Map base style to use (default: "CartoOSM")
  overlays:: List of overlays to put on top of base style (default: None)
  paper_size:: Paper size to use (default: "Din A4" 210x297mm²)
  orientation:: Paper orientation: "portrait" or "landscape" (default: "portrait")
  track_url:: URL pointing to a GPX track to download and print
  umap_url:: URL pointing to an Umap export file do download and print
  
  It is also possible to upload GPX and Umap files directly using a multipart/form-data
  POST request. In this case you have to submit the actual API JSON as a post parameter
  named "json", and add file fields named "track" for a GPX track, or "umap" for an
  Umap JSON export.
  
  After successfully submitting a request you can either poll the job result API every
  once in a while until it either returns the "200 OK" status, or a 4xx error code.
  
negative.code:     </trkseg>
    </trk>
  </gpx>
  --XXXXXXXX
  Content-Disposition: form-data; name="file2"; filename="test.umap"
  Content-Type: application/json
  
  {
    "type": "umap",
    "properties": {
      "name": "Umap test"
    },
    "layers": [
      {
        "type": "FeatureCollection",
        "features": [
          {
            "type": "Feature",
            "properties": {},
            "geometry": {
              "type": "Point",
              "coordinates": [
                8.535261,
                52.026977
              ]
            }
          }
        ],
        "_umap_options": {
          "name": "Layer 1"
        }
      }
    ]
  }
  --XXXXXXXX--
  ----
  
  