[issue4631] urlopen returns extra, spurious bytes

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Here is a patch without the _checkClosed() hack. The solution is simply
to remove redundant _checkClosed() calls in IOBase (for example,
readline() doesn't need to do an explicit `closed` check as it calls
read()).

Added file: http://bugs.python.org/file13021/urllib-chunked2.diff

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