example.com/404 returns 500 instead of 404 now.

Patch by Jon Dufresne.

* No longer attempts to close already freed socket file descriptor
* Use socket object to be compatible with Windows
* Do not use a timeout to avoid complication with non-blocking mode
* Use internal localhost server rather than depending on a third party
* Avoid trouble with buffered HTTP data by testing tunnelled CONNECT data

Use the default timeout of 30 seconds to avoid blocking forever.

In Python 2, these were duplicated; one for urllib.urlopen() and one for
urllib2.urlopen(). The test_urllibnet version has a better precondition to
avoid false failures with bad DNS, and the test_urllib2_localnet version had
a more up-to-date comment and domain name.

test_urllibnet.test_fileno intermittent failures with www.example.com.

failures when ssl is not present.

failures when ssl is not present.

new redirect of http://www.python.org/ to https://www.python.org.

requires them.  Disable executable bits and shebang lines in test and
benchmark files in order to prevent using a random system python, and in
source files of modules which don't provide command line interface.  Fixed
shebang line to use python3 executable in the unittestgui script.

an OSError can mean a bad DNS server and not an actual bug.

urllib.request.urlretrieve API now properly supplies a constant
non-zero block_size as it did in Python 3.2 and 2.7.  This matches the
behavior of urllib.request.URLopener.retrieve.

DNS service (e.g. OpenDNS) resolves a non-existent domain name.  The test
is now skipped instead.

DNS service (e.g. OpenDNS) resolves a non-existent domain name.  The test
is now skipped instead.

DNS service (e.g. OpenDNS) resolves a non-existent domain name.  The test
is now skipped instead.

whole HTTP exchange, not only the opening.

socket timeout of 30 when it checks for resource.  Explicit overrding (like
setting the 10) wont exhibit consistent behavior when tests are outside context
manager. So, settting it 30.

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r85630 | senthil.kumaran | 2010-10-17 16:22:12 +0530 (Sun, 17 Oct 2010) | 3 lines

  Fix Issue10119 - test_urllibnet failure when using support.transient_internet.
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svn+ssh://pythondev@svn.python.org/python/trunk

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  r79539 | florent.xicluna | 2010-04-01 01:01:03 +0300 (Thu, 01 Apr 2010) | 2 lines

  Replace catch_warnings with check_warnings when it makes sense.  Use assertRaises context manager to simplify some tests.
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svn+ssh://pythondev@svn.python.org/python/trunk

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  r77841 | ezio.melotti | 2010-01-30 09:22:54 +0200 (Sat, 30 Jan 2010) | 1 line

  #7092: silence py3k warnings for deprecated modules
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