def _Open(self, path_spec, mode='rb'):
    if path_spec.HasParent():
      raise errors.PathSpecError(
          u'Unsupported path specification with parent.')
The headers given at initialization should be modified:
dataset/ETHPy150Open log2timeline/dfvfs/dfvfs/vfs/os_file_system.py/OSFileSystem._Open--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/web/test/test_proxy.py/ProxyClientTestCase.test_headersCleanups