Opening a pipe fails on first attempt

[errordeveloper]

[errordeveloper]

@tomwilkie said it's by design, but should be 404 instead of 400...

[foot]

It is by design :).

404: pipe doesn't exist, request a new one.
400: pipe exists! why are you connecting to a websocket endpoint w/ a xhr GET? that is a very invalid thing to do here is a 400 for your troubles.

So we might be able to "fix" this in the client by checking if a pipe exists w/ a WS connection instead, I forget if we tried to do that in the past and it didn't work for some reason... Or the server could add a new endpoint that is not a WS that returns a 200 if a pipe exists.

[foot]

I will try in the client first.

[foot]

Oh yeah you can't read the http response code from a WS for browser security reasons.

Earlier discussions #650 (comment)

We'd need a new server endpoint.

[tomwilkie]

Dupe of #994