Always enforce HttpVersionPolicy on WebSocket version negotiation #2729
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BrennanConroy
approved these changes
Jan 28, 2025
benjaminpetit
approved these changes
Feb 4, 2025
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@MihaZupan Can this be merged? |
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Yep, I'll add another test and merge it once CI is back up |
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When we added HTTP/2 WebSocket support, the intention behind version selection was that we would match
SocketsHttpHandler/ClientWebSocketbehavior.When the user specified
Version=2.0, Policy=RequestVersionOrHigher, we should be attempting HTTP/2 WebSockets, regardless of whether the destination is using https or not.Currently, we'll use HTTP/1.1 instead, which goes against the specified policy.
Aside from violating the configured policy, the current behavior is problematic when the backend service only supports HTTP/2. Instead of using H2 as requested, we'll downgrade the H1, and all requests will fail.
This change makes YARP strictly follow the version policy. If the user told us not to use HTTP/1.X, we simply shouldn't.
If the backend server happens to only support HTTP/1.X, then the request will fail, and that's a proxy misconfiguration.