code: def get_osd_config(self, osd_version):
          
          if (osd_version in self.osd_config):
              return(self.osd_config[osd_version])
          else:
              raise IIIFStaticError("OpenSeadragon version %s not supported, available versions are %s" %
                                    (osd_version, ', '.join(sorted(self.osd_config.keys()))))
docs: Select appropriate portion of config.
  
          If the version requested is not supported the raise an exception with
          a helpful error message listing the versions supported.