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Deliver highly reliable chat experiences at scale.
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Broadcast realtime event data to millions of devices around the globe.
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Keep your frontend and backend in realtime sync, at global scale.
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Realtime experiences
Realtime experiences
11 min read•Last updatedUpdated Nov 16, 2023
WHAT IS WEBTRANSPORT AND CAN IT REPLACE WEBSOCKETS?
Written by
James Konik
WebTransport is a new specification that could offer an alternative to
WebSockets.
For applications that need low-latency, event-driven communication between
endpoints, WebSockets has been the go-to choice, but WebTransport may change
that.
In this article, you’ll learn what WebTransport offers and how it differs from
WebSockets. You’ll also learn when—and if—you should make the switch.
WEBSOCKETS VS WEBTRANSPORT, AT A GLANCE
WebSockets is a technology that enables bidirectional, full-duplex communication
between client and server over a persistent, single-socket connection. This
allows for low-latency, realtime updates, and the creation of richer
communication and gaming applications. Previously, the web was dependent on
requests and responses, which aren’t dynamic enough for those kinds of apps.
The newer WebTransport offers secure, multiplexed, realtime transport and
already has APIs for sending data both reliably and unreliably.
In a reliable data transfer, the sender is notified of the success or failure of
the data transmission, and failed transmissions are usually resent until they
succeed, after which the next data packet is sent. In unreliable transfer,
there’s no confirmation of transmission success, and packets that aren’t
received simply don’t get delivered. Unreliable transfer is often used for
things like streaming videos, where speed is a concern, and minor data loss,
such as a few frames of video, is acceptable. Because WebTransport uses both of
these methods, there are many use cases for it, such as bidirectional data
streaming for multiplayer gaming, interactive live streams, and data transfer
for sensors and internet of things devices.
WebTransport sends multiple streams within a single connection
While WebSockets creates a single stream per connection, WebTransport allows you
to create multiple streams over a single connection. It avoids the head-of-line
blocking delays that WebSockets suffers from, and is less resource intensive
when creating connections. While WebSockets starts as a HTTP/1.1 protocol,
WebTransport works on top of several different protocols, including some that
WebSockets don't support.
It works with HTTP/3, the upcoming version of the transport protocol used by the
World Wide Web. HTTP/3 uses the QUIC protocol for transport layer data exchange,
which has several advantages. QUIC can prevent head-of-line blocking delays,
improving network performance in many situations. This is a limitation of
WebSockets.
With WebTransport, you can also use features like promises and the await keyword
for asynchronous functions. The API runs in Web Workers, too, enabling
multithreading.
Here’s an example of an async function from the WebTransport Working Group’s
documentation.
async function sendData(url, data) {
const wt = new WebTransport(url);
const writable = await wt.createUnidirectionalStream();
const writer = writable.getWriter();
await writer.write(data);
await writer.close();
}
The WebTransport working group is still hammering out the details of the
specification, so more features and capabilities may come.
4 WEBTRANSPORT USE CASES
There are many potential use cases for WebTransport. Let’s look at four where it
shines.
1. ENCRYPTED STREAMING
WebTransport’s streams API allows you to create connections for sending ordered
data. As WebTransport uses the QUIC protocol, these connections are less
resource intensive to open and close than with TCP used by WebSockets.
You can also do things like offer streaming media more securely. WebTransport
has several security measures in place, such as requiring use of the Origin
header as well as specific opt-in via a transport parameter.
2. COMMUNICATION
WebTransport can send multiple types of data over the same connection. That
means you can send and receive video information unreliably while sending text
or file data reliably.
This feature allows you to do more with each connection, leading to richer
communication between a greater number of simultaneous users. It means that you
can send different types of content on different channels, so something like a
large image could be sent over a different connection than other data, which
would mean that the image can’t block chat communication.
You can also create bidirectional streams that allow either the server or client
to initiate communication, so if you’re implementing a messaging system, data
exchange can happen quickly.
3. MULTIPLAYER GAMEPLAY
WebTransport works with the HTTP/2, HTTP/3, and QUIC protocols. It can receive
data out of order over HTTP and can request data itself or listen to data that
is pushed by the server. It can do this both reliably and unreliably.
With WebTransport’s bidirectional streams, data pushed by the server has very
low latency, which is a big advantage for game development. It means less delay
between user input and the response, which can be critical in action games, such
as shooting, driving, or fighting.
It can also improve response times for cloud gaming services, where the server
handles rendering and gameplay and streams video to a thin client, which passes
back user input to the server.
4. SENSOR DATA
Many Internet of Things (IOT) devices log data that needs to be transferred to a
server, and a potential use of WebTransport is having a low-latency method for
transferring this. IOT devices often send small amounts of data regularly.
Consuming fewer resources has advantages for both the battery life of the
devices and with regard to network congestion.
As the IOT grows, the large number of devices in use consuming an
ever-increasing number of connections could become a problem, so the more
lightweight those devices are, the better.
CAN YOU USE WEBTRANSPORT?
Now let’s look at what specific features and capabilities WebTransport offers.
The specification is still at the public draft stage but is fully usable.
In addition to the QUIC protocol, there’s an API that lets browsers control
streams and datagrams. The API is HTTPS only, enforcing security.
QUIC
QUIC is a transport protocol designed to replace TCP and improve web
performance. It uses UDP, and HTTP/3 is designed to take advantage of it. When
using HTTP/3 over QUIC, it’s faster to establish connections, and congestion
control feedback is available to help avoid problems. As mentioned previously,
QUIC also prevents head-of-line blocking.
It doesn’t require as much header information, which allows lightweight
communication—without the overhead of HTTP. It’s also hardware independent, with
support required only at the application level.
QUIC is already widely supported in browsers and applications. Currently 7.7% of
websites use it, but the figure is increasing steadily.
If you want to experiment with QUIC in Chrome and many other Chromium-based
browsers, you can activate it in the settings.
Type chrome://flags in the URL bar, then find the Experimental QUIC protocol
setting and enable it, as in the screenshot below. (For Chromium-based browsers,
simply replace chrome://flags with [browser name]://flags.)
Chrome settings showing QUIC being enabled
OTHER PROTOCOLS
WebTransport can also run on top of either HTTP/2 or HTTP/3 without QUIC. It can
also use HTTP/2 as a fallback, allowing you to take advantage of the benefits of
WebTransport, regardless of the network.
HTTP/2 compatibility could potentially let you run it on older setups that don’t
support HTTP/3 and lets you take advantage of features like resource
prioritization.
DATAGRAMS
WebTransport works primarily with datagrams and streams. A datagram is a
self-contained packet of data that can arrive in any particular order. Datagrams
are sent unreliably. Unreliable data can be sent at high speed, and the
connection can cope if some data is dropped. The WebTransport specification
allows you to limit the datagram size using the maxDatagramSize attribute.
WebTransport objects have a datagrams object that can be accessed via its
readable and writable attributes. Datagrams can be queued, and you can also
create promises to wait for datagram transmission.
The WebTransport objects also include state data, indicating whether they are
connecting, connected, closed, or failed. They also include promises indicating
if the object is ready or closed.
STREAMS
Streams allow you to send ordered, reliable data. You can establish a stream and
have the server push this content to the client. It allows low-latency,
real-time communication.
In the API, WebTransport objects have slots for further objects representing
different types of stream. These include SendStream, ReceiveStream, and
Bidirectional Stream objects, all defined in the working draft of the
specification.
WebTransport also allows multistream data to be sent in a partially reliable
manner. Sent like this, data is not guaranteed to arrive in the right order
overall but is ordered by the status of other related streams. This works well
when sending video frames.
With streams, you can also pipe received data into a handler, such as a
TextDecoderStream that converts it into a format readily usable by your
application.
SendStream
SendStream objects are a kind of WritableStream used for outgoing data. They
store stream objects, but a SendStream object also contains a promise, which
defines an action it will take, such as being closed or aborted.
SendStream objects also include a slot to attach them to the HTTP/3 transport
layer.
ReceiveStream
ReceiveStream objects are a kind of ReadableStream that handles incoming data.
The ReceiveStream object is structured similarly to the SendStream objects, with
a stream slot and transport slot. It doesn’t, however, include promises.
Bidirectional stream
The bidirectional stream combines the send and receive streams into a single
object, which allows you to manage two-way communication in one place. Objects
have a readable and writable property, corresponding to the ReceiveStream and
SendStream objects discussed above.
These properties let them work with data sent in either direction. You read the
incoming stream and write to the outgoing stream.
Unidirectional streams
You can also create unidirectional streams. IncomingUnidirectionalStreams are
ReadableStreams consisting of multiple ReceiveStreams. You can call
createUnidirectionalStream() to create an outgoing equivalent.
COULD WEBTRANSPORT REPLACE WEBSOCKETS?
The WebTransport specification is still in flux, but its future looks bright. As
it continues to take shape, we’re sure to see more developers adopt it and
utilize the new features it brings.
Early adopters stand to reap big rewards but also take the biggest risks as it
isn’t clear how fully the specification will deliver on its promises. We don’t
know how well browsers will support it, how likely developers are to adopt it,
or how it will evolve.
WebTransport has advantages in some use cases, such as low-latency scenarios and
reusing connections for multiple purposes. It isn’t a silver bullet, though, and
there are scenarios where WebSockets will still be the best choice—or at least a
perfectly good one.
As a new specification, WebTransport is still nascent, so it will be harder to
get working until other tools are updated to work with it. For now, that means
keeping eyes and minds open and being ready to adapt.
WebSockets still offer a great deal of functionality, and as an established
standard, are fully supported by all modern browsers. WebTransport should offer
modest performance improvements and incremental gains, but will also likely
create new engineering challenges that will have to be addressed to build
production-ready systems.
DOES ABLY SUPPORT WEBTRANSPORT?
At Ably where we offer a realtime communication API used by developers to build
experiences like chat, multiplayer collaboration, and other live updates in your
web and mobile applications at scale. Under the hood, we build on lower-level
communication protocols to enable features like online presence, message
history, queues, and more. Most developers use Ably with WebSocket transport,
but we also support HTTP, SSE, and MQTT. Our community sometimes wonders - is
Ably currently exploring WebTransport? And the answer is yes, but until the
future of WebTransport is more certain, we’re focused on WebSockets.
If you are looking to implement reliable realtime messaging in your application,
I encourage you to give Ably a try!
CONCLUSION
WebTransport is already a viable alternative to WebSockets, with several
advantages. The lack of head of line blocking, slightly lower latency, and
versatility of the multi-protocol approach offer benefits in many scenarios.
As the technology is not fully defined yet, the tooling is less developed, and
will be for a while. On the other hand, the API is usable, and the opportunity
is there to be the quickest to market with products that benefit from its
strengths.
It’s too early to predict what WebTransport will be used for, but the first
teams to use it have every chance to build something groundbreaking.
Though there’s no urgent need to switch, developers should keep an eye on it for
future projects and be ready to use it if it’s the best fit.
On this page
1. WebSockets vs WebTransport, at a glance
2. 4 WebTransport use cases
1. 1. Encrypted streaming
2. 2. Communication
3. 3. Multiplayer gameplay
4. 4. Sensor data
3. Can you use WebTransport?
1. QUIC
2. Other protocols
3. Datagrams
4. Streams
4. Could WebTransport replace WebSockets?
5. Does Ably support WebTransport?
6. Conclusion
BUILD DEPENDABLE REALTIME APPS
Ably offers versatile, easy-to-use APIs to develop powerful realtime apps.
Guaranteed to deliver at scale.
Start building
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