code: def application(environ, start_response):
      
      path = environ.get("PATH_INFO", "").lstrip("/")
      logger.debug("<application> PATH: '%s'", path)
  
      if path == "metadata":
          return metadata(environ, start_response)
  
      logger.debug("Finding callback to run")
      try:
          for regex, spec in urls:
              match = re.search(regex, path)
              if match is not None:
                  if isinstance(spec, tuple):
                      callback, func_name, _sp = spec
                      cls = callback(_sp, environ, start_response, cache=CACHE)
                      func = getattr(cls, func_name)
                      return func()
                  else:
                      return spec(environ, start_response, SP)
          if re.match(".*static/.*", path):
              return handle_static(environ, start_response, path)
          return not_found(environ, start_response)
      except StatusError as err:
          logging.error("StatusError: %s" % err)
          resp = BadRequest("%s" % err)
          return resp(environ, start_response)
      except Exception as err:
          # _err = exception_trace("RUN", err)
          # logging.error(exception_trace("RUN", _err))
          print(err, file=sys.stderr)
          resp = ServiceError("%s" % err)
          return resp(environ, start_response)
docs: The main WSGI application. Dispatch the current request to
      the functions from above.
  
      If nothing matches, call the `not_found` function.
  
      :param environ: The HTTP application environment
      :param start_response: The application to run when the handling of the
          request is done
      :return: The response as a list of lines