Usually when you send an HTTP Request, server sends a response with the file requested, sometimes, instead of send a single response, server can send multiple response like a stream, in these cases you can use OnHTTP2ResponseFragment event to capture these responses and show to user.
Example: send a request to https://http2.golang.org/clockstream and server will send a stream response every second.
oClient := TsgcHTTP2Client.Create(nil);
oClient.OnHTTP2ResponseFragment := OnHTTP2ResponseFragmentEvent;
oClient.Get('https://http2.golang.org/clockstream');
...
procedure OnHTTP2ResponseFragmentEvent(Sender: TObject; const Connection: TsgcHTTP2ConnectionClient;
const Request: TsgcHTTP2RequestProperty; const Fragment: TsgcHTTP2ResponseFragmentProperty);
begin
ShowMessage(Fragment.DataString);
end;