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The upcoming HTTP/3 standard is no longer based on TCP, but on the QUIC protocol. WebSocket is based on TCP and is initiated as HTTP update.
Is a WebSocket connection initiated as HTTP/3 update based on QUIC instead of TCP? Or is it not possible to update a HTTP/3 connection to a WebSocket connection?
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HTTP/3 is already supported by 75% of web browsers (and 83% of "tracked desktop" web browsers), and 26% of the top 10 million websites. It has been supported by Chromium (and derived projects including Google Chrome, Microsoft Edge, Samsung Internet, and Opera) since April 2020 and by Mozilla Firefox since May 2021.
Do websocket implementations use http protocol internally? Yes, initially, then they switch to the webSocket protocol. All webSocket connections start with an HTTP request with a header that requests an upgrade to the webSocket protocol.
Almost all the real-time applications like (trading, monitoring, notification) services use WebSocket to receive the data on a single communication channel. Simple RESTful application uses HTTP protocol which is stateless. All the frequently updated applications used WebSocket because it is faster than HTTP Connection.
There is no websockets for HTTP/2. Note that websockets is not part of the HTTP/1 spec, it just uses a HTTP/1 protocol detail to switch an HTTP connection into a websockets connection. Websockets over HTTP/2 would similarly not be a part of the HTTP/2 specification but would be separate.
Since this is the top search result for "http3 websockets", I want to keep the answers up-to-date.
As of December 2021, there is now an IETF draft that amends RFC8441 (Bootstrapping WebSockets with HTTP/2) with the adjustments necessary for HTTP/3. If the draft is accepted, there will be a standardized way for WebSockets to be initiated over HTTP/3.
The draft is on its second revision and will expire in July 2022 if there are no further revisions and it is not accepted by that time.
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