[BUG] Dialer type registered unconditionally into proxy

[imirkin]

Is there an existing issue for this?

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Current Behavior

No response

Expected Behavior

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Steps To Reproduce

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Anything else?

666c197

This change seems to have switched from the private proxy copy into the project-wide golang.org/x/net/proxy. (It's vendored here, but if one vendors websocket, then it will end up using the sharedly-vendored variant.) Since the registration comes from init() there's no way to prevent it even if the client functionality in question is not needed or desired. Previously this was done into a private "copy" of the proxy logic, which was fine since it was entirely scoped to the websocket client logic. But now it's leaking out.