A dead proxy, or one that exits from this machine's IP, now fails with INVALID_PROXY instead of retrying every request; remote session create also builds the service off the event loop so a stuck check cannot block the server.
A service that picks its auth path in init could only check the server's cookies directory, so a client-sent jar was invisible and the service fell back to the wrong path. The ctx now carries cookies_supplied, and a malformed cookie blob answers 400 instead of 500.
The server no longer spends its configured proxy providers on a remote client unless the API key sets server_proxy. It places the client by geolocating the connection address and asks for a proxy when that region does not match its own.
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