anchor.diff:    return os.fstat(file.fileno()).st_size
   
   # Routine to report an error
  -def output_error(message):
  +def output_error(message, status = "400 Bad Request"):
  +  print "Status: %s" % status
     output_headers("text/html")
     print "<html>"
     print "<head>"
  
positive.code:       # Zoom the map to the bounding box
        map.zoom_to_box(bbox)
  
        # Render the map
        if form.getvalue("format") == "png":
          image = mapnik.Image(map.width, map.height)
          mapnik.render(map, image)
          png = image.tostring("png")
          output_headers("image/png", "map.png", len(png))
          sys.stdout.write(png)
        elif form.getvalue("format") == "jpeg":
          image = mapnik.Image(map.width, map.height)
          mapnik.render(map, image)
          jpeg = image.tostring("jpeg")
          output_headers("image/jpeg", "map.jpg", len(jpeg))
          sys.stdout.write(jpeg)
        elif form.getvalue("format") == "svg":
          file = tempfile.NamedTemporaryFile(prefix = "export")
          surface = cairo.SVGSurface(file.name, map.width, map.height)
          mapnik.render(map, surface)
          surface.finish()
          output_headers("image/svg+xml", "map.svg", file_size(file))
          output_file(file)
        elif form.getvalue("format") == "pdf":
          file = tempfile.NamedTemporaryFile(prefix = "export")
          surface = cairo.PDFSurface(file.name, map.width, map.height)
          mapnik.render(map, surface)
          surface.finish()
          output_headers("application/pdf", "map.pdf", file_size(file))
          output_file(file)
        elif form.getvalue("format") == "ps":
          file = tempfile.NamedTemporaryFile(prefix = "export")
          surface = cairo.PSSurface(file.name, map.width, map.height)
          mapnik.render(map, surface)
          surface.finish()
          output_headers("application/postscript", "map.ps", file_size(file))
          output_file(file)
        else:
          output_error("Unknown format '%s'" % form.getvalue("format"))
  
negative.code: # Process the request
  if idletime < 0.2:
    # Abort if the CPU idle time on the machine is too low
    output_error("The server is too busy at the moment. Please wait a few minutes before trying again.", "503 Service Unavailable")
  <% @blocks["user_agents"].each do |user_agent| -%>
  elif os.environ['HTTP_USER_AGENT'] == '<%= user_agent %>':
    # Block scraper
    output_error("The server is too busy at the moment. Please wait a few minutes before trying again.", "503 Service Unavailable")
  <% end -%>
  elif not form.has_key("bbox"):
    # No bounding box specified
  