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67 lines
2.1 KiB
67 lines
2.1 KiB
:mod:`urllib.error` --- Exception classes raised by urllib.request
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==================================================================
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.. module:: urllib.error
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:synopsis: Exception classes raised by urllib.request.
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.. moduleauthor:: Jeremy Hylton <jeremy@alum.mit.edu>
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.. sectionauthor:: Senthil Kumaran <orsenthil@gmail.com>
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**Source code:** :source:`Lib/urllib/error.py`
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--------------
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The :mod:`urllib.error` module defines the exception classes for exceptions
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raised by :mod:`urllib.request`. The base exception class is :exc:`URLError`.
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The following exceptions are raised by :mod:`urllib.error` as appropriate:
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.. exception:: URLError
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The handlers raise this exception (or derived exceptions) when they run into
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a problem. It is a subclass of :exc:`OSError`.
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.. attribute:: reason
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The reason for this error. It can be a message string or another
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exception instance.
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.. versionchanged:: 3.3
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:exc:`URLError` has been made a subclass of :exc:`OSError` instead
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of :exc:`IOError`.
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.. exception:: HTTPError
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Though being an exception (a subclass of :exc:`URLError`), an
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:exc:`HTTPError` can also function as a non-exceptional file-like return
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value (the same thing that :func:`~urllib.request.urlopen` returns). This
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is useful when handling exotic HTTP errors, such as requests for
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authentication.
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.. attribute:: code
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An HTTP status code as defined in :rfc:`2616`. This numeric value corresponds
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to a value found in the dictionary of codes as found in
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:attr:`http.server.BaseHTTPRequestHandler.responses`.
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.. attribute:: reason
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This is usually a string explaining the reason for this error.
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.. attribute:: headers
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The HTTP response headers for the HTTP request that caused the
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:exc:`HTTPError`.
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.. versionadded:: 3.4
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.. exception:: ContentTooShortError(msg, content)
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This exception is raised when the :func:`~urllib.request.urlretrieve`
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function detects that
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the amount of the downloaded data is less than the expected amount (given by
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the *Content-Length* header). The :attr:`content` attribute stores the
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downloaded (and supposedly truncated) data.
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