gh-77476: Remove urllib HTTP test (#139502)

Remove test_sites_no_connection_close() which is skipped since 2018
(commit 36d56ea).

Author: vstinner

Lib/test/test_urllib2net.py

@@ -218,27 +218,6 @@ def test_custom_headers(self):
             opener.open(request)
             self.assertEqual(request.get_header('User-agent'),'Test-Agent')
 
-    @unittest.skip('XXX: http://www.imdb.com is gone')
-    def test_sites_no_connection_close(self):
-        # Some sites do not send Connection: close header.
-        # Verify that those work properly. (#issue12576)
-
-        URL = 'http://www.imdb.com' # mangles Connection:close
-
-        with socket_helper.transient_internet(URL):
-            try:
-                with urllib.request.urlopen(URL) as res:
-                    pass
-            except ValueError:
-                self.fail("urlopen failed for site not sending \
-                           Connection:close")
-            else:
-                self.assertTrue(res)
-
-            req = urllib.request.urlopen(URL)
-            res = req.read()
-            self.assertTrue(res)
-
     def _test_urls(self, urls, handlers, retry=True):
         import time
         import logging