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In the above example we only supplied our ``HTTPBasicAuthHandler`` to
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``build_opener``. By default openers have the handlers for normal situations
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-- ``ProxyHandler``, ``UnknownHandler``, ``HTTPHandler``,
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environment variable is set), ``UnknownHandler``, ``HTTPHandler``,
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``HTTPDefaultErrorHandler``, ``HTTPRedirectHandler``, ``FTPHandler``,
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``FileHandler``, ``HTTPErrorProcessor``.