Envoy: Websockets and retries

[daniel-bolanos]

Is it possible to configure Envoy to retry a Websocket connection on another backend server when either:

• the Websocket upgrade fails (for example a 503 is returned instead of a 101)
• the server does not accept the connection

thank you!

[mattklein123]

I don't think we support Websocket retries currently, but @alyssawilk would know for sure. She is doing a bunch of work in this area and might be able to get this tracked as a feature addition as needed.

[alyssawilk]

I think websockets are treated just as other HTTP requests. So there's no way to make only websockets retry, but if configured buffer enough of the upgrade request that if you 5xx you could send the upgrade header elsewhere.

[daniel-bolanos]

hi @alyssawilk thank you for your response. When you say

there's no way to make only websockets retry

Should I understand that it is because the websocket upgrade is just another GET request, so it will be treated just the same?

So, if I configure retries for GET, lets say for 503 error codes, will that make Envoy to retry the GET (upgrage request) on a different backend when the first one returns 503 (instead of a 101)?

[alyssawilk]

I believe that will work - if it doesn't I'm happy to dig a bit :-)

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