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