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68 lines
2.5 KiB
Python
68 lines
2.5 KiB
Python
"""Exception classes raised by urllib.
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The base exception class is URLError, which inherits from IOError. 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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# do these error classes make sense?
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# make sure all of the IOError stuff is overridden. we just want to be
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# subtypes.
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class URLError(IOError):
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# URLError is a sub-type of IOError, 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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# 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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# exception raised when downloaded size does not match content-length
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class ContentTooShortError(URLError):
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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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