"""Exception classes raised by urllib.

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The base exception class is URLError, which inherits from OSError. It

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doesn't define any behavior of its own, but is the base class for all

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exceptions defined in this package.

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HTTPError is an exception class that is also a valid HTTP response

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instance. It behaves this way because HTTP protocol errors are valid

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responses, with a status code, headers, and a body. In some contexts,

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an application may want to handle an exception like a regular

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response.

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"""

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import urllib.response

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__all__ = ['URLError', 'HTTPError', 'ContentTooShortError']

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class URLError(OSError):

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# URLError is a sub-type of OSError, but it doesn't share any of

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# the implementation. need to override __init__ and __str__.

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# It sets self.args for compatibility with other EnvironmentError

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# subclasses, but args doesn't have the typical format with errno in

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# slot 0 and strerror in slot 1. This may be better than nothing.

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def __init__(self, reason, filename=None):

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self.args = reason,

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self.reason = reason

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if filename is not None:

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self.filename = filename

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def __str__(self):

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return '<urlopen error %s>' % self.reason

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class HTTPError(URLError, urllib.response.addinfourl):

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"""Raised when HTTP error occurs, but also acts like non-error return"""

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__super_init = urllib.response.addinfourl.__init__

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def __init__(self, url, code, msg, hdrs, fp):

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self.code = code

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self.msg = msg

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self.hdrs = hdrs

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self.fp = fp

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self.filename = url

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# The addinfourl classes depend on fp being a valid file

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# object. In some cases, the HTTPError may not have a valid

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# file object. If this happens, the simplest workaround is to

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# not initialize the base classes.

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if fp is not None:

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self.__super_init(fp, hdrs, url, code)

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def __str__(self):

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return 'HTTP Error %s: %s' % (self.code, self.msg)

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def __repr__(self):

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return '<HTTPError %s: %r>' % (self.code, self.msg)

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# since URLError specifies a .reason attribute, HTTPError should also

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# provide this attribute. See issue13211 for discussion.

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@property

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def reason(self):

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return self.msg

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@property

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def headers(self):

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return self.hdrs

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@headers.setter

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def headers(self, headers):

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self.hdrs = headers

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class ContentTooShortError(URLError):

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"""Exception raised when downloaded size does not match content-length."""

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def __init__(self, message, content):

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URLError.__init__(self, message)

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self.content = content

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