Everything sgcQUIC does, mapped across the four components and the RFCs they implement. The raw QUIC pair gives you streams and datagrams; the HTTP/3 pair adds request/response, QPACK and WebTransport. Every capability works the same in Delphi, C++ Builder and .NET, and every license ships full source code. Click a component for its own page with usage and examples.
RFC 9000
RFC 9114 + QPACK
RFC 9220
TLS 1.3 / OpenSSL 3.5
Two layers: raw QUIC transport, and HTTP/3 request/response built on it.
| Component | Class | Family | Description |
|---|---|---|---|
| QUIC Client | TsgcQUICClient | QUIC | Raw QUIC transport client: streams and datagrams, 0-RTT, connection migration (RFC 9000). |
| QUIC Server | TsgcQUICServer | QUIC | Raw QUIC transport server: binds a UDP port, terminates TLS 1.3, raises per-connection and per-stream events. |
| HTTP/3 Client | TsgcHTTP3Client | HTTP/3 | HTTP/3 client with QPACK, Alt-Svc, server push, Extended CONNECT and WebTransport (RFC 9114). |
| HTTP/3 Server | TsgcHTTP3Server | HTTP/3 | HTTP/3 server: serves requests over QUIC, server push, WebTransport sessions and datagrams. |
The transport layer, exposed directly for building your own protocol on top of QUIC.
| Capability | Client | Server | Notes |
|---|---|---|---|
| Single combined transport + TLS 1.3 handshake | ✓ | ✓ | One flight completes the connection; no separate TLS round trip. |
| Independent bidirectional streams | ✓ | ✓ | A lost packet only stalls the streams whose data it carried. |
| Unidirectional streams | ✓ | ✓ | OpenStream(aUnidirectional := True) on the builtin engine. |
| Multiple streams per connection | ✓ | ✓ | EnableMultiStream / OpenStream on the qmBuiltin engine. |
| 0-RTT resumption | ✓ | ✓ | A resumed session can carry early data in the first flight. |
| Connection migration | ✓ | ✓ | Connection-ID based; survives the client changing network. |
| Send / receive bytes | WriteData | WriteData(connection, …) | String or TBytes payloads on a stream. |
| Connection lifecycle events | OnQUICConnect / OnQUICDisconnect | OnQUICConnect / OnQUICDisconnect | Plus OnQUICException for transport errors. |
| Inbound stream data event | OnQUICStreamData | OnQUICStreamData / OnQUICData | Fires as stream bytes arrive. |
HTTP semantics over QUIC, with the HTTP/3-specific machinery exposed as methods and events.
| Capability | Client | Server | Notes |
|---|---|---|---|
| Request methods | GET, HEAD, POST, PUT, DELETE, PATCH, OPTIONS, TRACE, CONNECT, QUERY | ✓ | Each a blocking call on the client, most with an asynchronous variant. |
| QPACK header compression | ✓ | ✓ | RFC 9204, with dynamic-table updates on dedicated encoder/decoder streams. |
| Alt-Svc discovery | OnAltSvc | advertises | RFC 7838; the client parses the header and lets your app decide when to switch. |
| Server push | SetMaxPushId / OnPushPromise / OnPush | push from OnH3Request | The client advertises a limit and can refuse pushed responses. |
| Extended CONNECT tunnels | ExtendedConnect / TunnelSend / OnTunnelData | OnH3TunnelData / TunnelSend | RFC 9220 tunnels another protocol through a request stream. |
| Request event | — | OnH3Request | Fires per request; the application fills the response. |
| Graceful shutdown | OnGoAway | GOAWAY | RFC 9114 connection shutdown signalling. |
| Certificate / key | — | QUICOptions.SSLOptions.CertFile / KeyFile | PEM certificate and private key for the listener. |
Sessions negotiated over Extended CONNECT that hand the application QUIC streams directly.
| Capability | Client | Server | Notes |
|---|---|---|---|
| Establish a session | WebTransportConnect | OnWebTransportSession | Bootstrapped over an HTTP/3 Extended CONNECT request. |
| Bidirectional streams | ✓ | ✓ | Low-latency bidirectional traffic on the builtin engine. |
| Datagrams | ✓ | SendDatagram | Unreliable datagrams alongside the session's streams. |
| Builtin engine required | ✓ | ✓ | A session needs several streams on one connection (qmBuiltin). |
A standards-based stack on the native OpenSSL 3.5 QUIC engine.
| Area | Detail |
|---|---|
| RFC 9000 | QUIC transport — streams, connection IDs, migration, combined transport + TLS handshake. |
| RFC 9114 | HTTP/3 — HTTP semantics mapped onto QUIC streams. |
| RFC 9204 | QPACK — header compression for HTTP/3. |
| RFC 9220 | WebTransport bootstrapping over HTTP/3 (Extended CONNECT). |
| RFC 7838 | Alt-Svc — HTTP/3 availability advertised by the server. |
| TLS | TLS 1.3, built into the QUIC handshake. |
| Crypto engine | Native QUIC in OpenSSL 3.5 (qmBuiltin, multi-stream). A qmCustom path exists for quictls-style builds, limited to a single stream per connection. |
| Platforms | Win32, Win64 and Linux64, plus macOS, iOS and Android where the OpenSSL 3.5 QUIC engine is available. |
| Languages | Delphi and C++ Builder (7 through 13), and .NET with the identically named Tsgc classes. |