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aM Exception indicating a violation of the HTTP/1.1 protocol.
This as an abstract base class, with two concrete base classes:
:exc:`LocalProtocolError`, which indicates that you tried to do something
that HTTP/1.1 says is illegal, and :exc:`RemoteProtocolError`, which
indicates that the remote peer tried to do something that HTTP/1.1 says is
illegal. See :ref:`error-handling` for details.
In addition to the normal :exc:`Exception` features, it has one attribute:
.. attribute:: error_status_hint
This gives a suggestion as to what status code a server might use if
this error occurred as part of a request.
For a :exc:`RemoteProtocolError`, this is useful as a suggestion for
how you might want to respond to a misbehaving peer, if you're
implementing a server.
For a :exc:`LocalProtocolError`, this can be taken as a suggestion for
how your peer might have responded to *you* if h11 had allowed you to
continue.
The default is 400 Bad Request, a generic catch-all for protocol
violations.
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