Obsolete claims on firefox, HTTP/2 websockets is now enables by default and the setting is renamed

[dmartensson]

Description

In the purple note in the beginning it states this

"Chrome and Edge have HTTP/2 WebSockets enabled by default, and you can enable it in FireFox on the about:config page with the network.http.spdy.websockets flag."

This is no longer correct, Firefox has support for HTTP/2 websockets enabled by default and the setting is also renamed to "network.http.http2.websockets"

Page URL

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/websockets?view=aspnetcore-9.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/websockets.md

Document ID

762efeed-010e-f422-03d0-22d6681b2851

Platform Id

3e06aef0-84df-6106-fb9c-2d43e7e95d19

Article author

@wadepickett

Metadata

• ID: a3b0cac1-adc7-434c-d867-6e28e39bdae7
• PlatformId: 3e06aef0-84df-6106-fb9c-2d43e7e95d19
• Service: aspnet-core
• Sub-service: fundamentals

Related Issues

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Associated WorkItem - 498815

[wadepickett]

Summary prep for Copilot to follow:

Issue Analysis: Obsolete Firefox WebSockets Information

Issue Summary

The documentation contains outdated information about Firefox's HTTP/2 WebSockets support.

Affected File

• aspnetcore/fundamentals/websockets.md

Problem Description

On line 36 of the websockets.md file, there is an outdated note stating:

Chrome and Edge have HTTP/2 WebSockets enabled by default, and you can enable it in FireFox on the about:config page with the network.http.spdy.websockets flag.

This information is no longer accurate. Firefox now has HTTP/2 WebSockets enabled by default, and the configuration flag has been renamed from network.http.spdy.websockets to network.http.http2.websockets.

Proposed Solution

Update line 36 in the websockets.md file to reflect the current state of Firefox's WebSockets support:

Original text:

> Chrome and Edge have HTTP/2 WebSockets enabled by default, and you can enable it in FireFox on the `about:config` page with the `network.http.spdy.websockets` flag.

Suggested replacement:

> Chrome, Edge, and Firefox have HTTP/2 WebSockets enabled by default. If you need to manually configure this setting in Firefox, it can be found in the `about:config` page with the `network.http.http2.websockets` flag.

Target .NET Version

Based on the documentation, this applies to ASP.NET Core 9.0 (line 15 shows :::moniker range=">= aspnetcore-9.0") and the article's last update date is listed as July 9, 2025 (line 8).

Impact Assessment

This is a straightforward text correction that doesn't impact any code samples or functionality descriptions. The change will provide users with accurate information about browser support for HTTP/2 WebSockets.

[wadepickett]

@dmartensson, thanks for pointing this issue out. Much appreciated. We will get it fixed.