code: def parse_extra(self, extra):
          
          if extra.startswith('/'):
              extra = extra[1:]
          r = IIIFRequest(identifier='dummy',
                          api_version=self.api_version)
          r.parse_url(extra)
          if (r.info):
              raise IIIFStaticError("Attempt to specify Image Information in extras.")
          return(r)
docs: Parse extra request parameters to IIIFRequest object.