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lib/mint/web_socket/upgrade_failure_error.ex
defmodule Mint.WebSocket.UpgradeFailureError do
@moduledoc """
An error representing a failure to upgrade protocols from HTTP to WebSocket
"""
defexception [:status_code, :headers]
def message(%__MODULE__{} = error) do
"""
Could not upgrade from HTTP to WebSocket. The server returned status code #{error.status_code} with headers:
#{inspect(error.headers)}
"""
end
end