QCloudSMHHeadFileRequest * request = [QCloudSMHHeadFileRequest new];
// Space ID; if the media library is in single-tenant mode, this parameter is fixed as a hyphen (-); if the media library is in multi-tenant mode, you must specify this parameter
requeset.spaceId = @"spaceId";
// Media Library ID, required parameter
requeset.libraryId = @"libraryId";
// Complete file path, for example /api/v1/file/smhxxx/-/foo/bar/file.docx
request.filePath = @"filePath";
// Earlier version ID, used to obtain file content of different versions, optional parameter, defaults to the latest version;
request.historyId = @"historyId";
[request setFinishBlock:^(id  _Nullable outputObject, NSError * _Nullable error) {

}];
[[QCloudSMHService defaultSMHService] headFile:request];