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[Speed] Creates section about multiplexing #19001

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Jan 3, 2025
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[Speed] Creates section about multiplexing #19001

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11 changes: 6 additions & 5 deletions src/content/docs/speed/optimization/protocol/http2-to-origin.mdx
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Expand Up @@ -25,14 +25,15 @@ If you wish to disable HTTP/2 to Origin, you can follow these steps:
3. Select **Speed > Optimization**.
4. Navigate to the **Protocol Optimization** tab and under **HTTP/2 to Origin** set the toggle to **Off**.

## Connection multiplexing

Connection multiplexing is enabled by default on Free, Pro and Business zones. Enterprise zones will be enabled at a later date.

HTTP/2 uses multiplexing to allow multiple concurrent requests and responses over a single TCP connection. If your origin does not support multiplexing, enabling HTTP/2 to origin may result in 5xx errors, particularly 520s.

## Protocol compatibility

Note that if the origin does not support HTTP/2, Cloudflare will initiate an HTTP/1.1 connection.
We connect to servers who announce support of HTTP/2 connections via [ALPN](https://blog.cloudflare.com/introducing-http2).

If you are unsure if your server supports HTTP/2, we suggest checking your origin server’s documentation or using a testing tool for HTTP/2 implementation (for example, [h2spec](https://github.com/summerwind/h2spec)).

:::note[Note]

Connection multiplexing is currently being rolled out. It has been enabled by default on Free, Pro and Business zones. Enterprise zones will be enabled at a later date.
:::
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