Unreal QUIC

A high-performance QUIC client plugin for Unreal Engine 5 using MsQuic (C API)

Overview

UEQuic is a QUIC client plugin for Unreal Engine 5.5+ built on top of the Microsoft MsQuic C API. It enables low-latency, secure, and reliable connections with support for bidirectional and unidirectional streams, certificate-based security, reconnect logic, and full Blueprint integration.

✨ Features

• 🔒 QUIC 1.0 client support via MsQuic (C API, no wrappers)

• 🔁 Re-connection logic with retry and delay settings

• 🧠 Runtime credential configuration (ALPN, certificates, validation)

• 📡 Stream support (send/receive, unidirectional & bidirectional)

• 🧵 Thread-safe re-connection using AsyncTask and FTimerHandle

• 📘 Full Blueprint support for connection and messaging

• ⚙️ Configurable keep-alive support and transport tuning

📦 Plugin Structure

Component	Description
UVpQuicConnection	Manages QUIC connection lifecycle and stream spawning
UVpQuicStream	Wraps a QUIC stream (send/receive API)
FVpQuicApi	Handles MsQuic initialization, configuration, and shutdown
UVpQuicHelperLibrary	Utility functions for sending structured data (e.g. text, ping) via Blueprint

🧪 Example: Connect from Blueprint

UVpQuicConnection* QuicConn = NewObject<UVpQuicConnection>();

Connect

FQuicConnectOptions Options;
Options.ALPN = "h3"; // Match server
Options.bDisableCertificateValidation = true;

QuicConn->ConnectToServer("127.0.0.1", 4433, Options);

Create a stream and send data

Event OnDataReceived (Stream)
    → Print String (from Bytes)