code: def _get_context_path(self, port):
          
          if self.proxy_base:
              return url_path_join(self.base_url, self.proxy_base)
          if self.absolute_url:
              return url_path_join(self.base_url, 'proxy', 'absolute', str(port))
          else:
              return url_path_join(self.base_url, 'proxy', str(port))
docs: Some applications need to know where they are being proxied from.
          This is either:
          - {base_url}/proxy/{port}
          - {base_url}/proxy/absolute/{port}
          - {base_url}/{proxy_base}