Fall back to GET when connection is reset.

doc/changelog.txt

@@ -1,6 +1,9 @@
 6.0 "" (released xx.xx.2010)
 
 Fixes:
+- checking: Fall back to HTTP GET requests when the connection has
+  been resets since some servers tend to do this for HEAD requests.
+  Closes: SF bug #3114622
 
 Changes:
 - dependencies: Require and use Python 2.6.

linkcheck/checker/httpurl.py

@@ -21,6 +21,7 @@ Handle http links.
 import urlparse
 import urllib
 import re
+import errno
 import zlib
 import socket
 from cStringIO import StringIO
@@ -40,8 +41,7 @@ from .const import WARN_HTTP_ROBOTS_DENIED, \
 # helper alias
 unicode_safe = strformat.unicode_safe
 
-supportHttps = hasattr(httplib, "HTTPSConnection") and \
-               hasattr(socket, "ssl")
+supportHttps = hasattr(httplib, "HTTPSConnection")
 
 _supported_encodings = ('gzip', 'x-gzip', 'deflate')
 
@@ -185,6 +185,15 @@ class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
                     self.fallback_get = True
                     continue
                 raise
+            except socket.error, msg:
+                # some servers reset the connection on HEAD requests
+                if self.method == "HEAD" and self.method_get_allowed and \
+                   msg[0] == errno.ECONNRESET:
+                    self.method = "GET"
+                    self.aliases = []
+                    self.fallback_get = True
+                    continue
+                raise
             if response.reason:
                 response.reason = unicode_safe(response.reason)
             log.debug(LOG_CHECK,