WebTransport - Interactive Tool | IconVault
Learn WebTransport: browser support check, datagrams vs streams, and an honest simulated QUIC handshake walkthrough. Free.
WebTransport
QUIC datagrams vs streams with a simulated handshake walkthrough
WebTransport in this browser
Checking…
Chrome/Edge 97+. Firefox and Safari do not ship it yet.
Honest scope
A real WebTransport connection needs your own HTTP/3 server with valid certificates. This page cannot open one, so the walkthrough below is a simulation of the protocol steps, not a live socket. Nothing here pretends otherwise.
Simulated handshake walkthrough
- 1
DNS + UDP reachability
- 2
QUIC handshake (1 RTT)
- 3
HTTP/3 SETTINGS exchange
- 4
CONNECT to :protocol = webtransport
- 5
Session ready
- 6
0-RTT on reconnect
Timings above are illustrative, not measured. Real handshake time depends on network RTT.
Datagrams vs streams
Datagrams
- • Unreliable and unordered, like UDP
- • Best for: game state, live telemetry, voice frames
- • Lost packets are simply skipped, no head-of-line blocking
- • Size limit comes from the QUIC max datagram frame
Streams
- • Reliable and ordered, like TCP
- • Best for: file transfer, chat messages, RPC
- • Lost packets are retransmitted automatically
- • Multiple streams multiplex with independent flow control
Typical round trips (illustrative)
Real client code
// Real WebTransport client (needs an HTTP/3 server + valid certs)
const transport = new WebTransport("https://example.com:4433/counter");
await transport.ready; // session established
// 1. Unreliable datagrams
const writer = transport.datagrams.writable.getWriter();
await writer.write(new TextEncoder().encode("ping"));
writer.releaseLock();
// 2. Reliable bidirectional stream
const stream = await transport.createBidirectionalStream();
const sWriter = stream.writable.getWriter();
await sWriter.write(new TextEncoder().encode("hello over QUIC"));
sWriter.releaseLock();
await transport.closed;5 of 5 free walkthroughs left.
About this tool
IconVault's WebTransport playground teaches the browser's QUIC-based networking API with radical honesty. It detects whether your browser actually ships WebTransport, then walks you through a clearly labeled simulated handshake, because a real connection requires your own HTTP/3 server with valid certificates, which no web page can conjure. Nothing here pretends to open a live socket.
You will learn when to use unreliable datagrams (game state, telemetry, voice) versus reliable streams (chat, files, RPC), see illustrative round-trip comparisons against TCP plus TLS, and copy a production-ready client snippet for your own server. Free, and runs fully in your browser.
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