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Detect sites not supporting HEAD requests.

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This commit is contained in:
Bastian Kleineidam 2012-08-14 18:43:39 +02:00
parent db76f01d48
commit 6915e2f989
2 changed files with 21 additions and 19 deletions
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2
doc/changelog.txt
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@ -21,6 +21,8 @@ Fixes:
- checking: Do not handle <object codebase="..."> attribute as parent
URL but as normal URL to be checked.
- checking: Fix UNC path handling on Windows.
- checking: Detect more sites not supporting HEAD requests properly.
Closes: SF bug #3535981
7.9 "The Dark Knight" (released 10.6.2012)

38
linkcheck/checker/httpurl.py
View file

@ -65,8 +65,6 @@ class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
super(HttpUrl, self).reset()
self.max_redirects = 5
self.has301status = False
# flag if check had to fallback from HEAD to GET method
self.fallback_get = False
# flag if connection is persistent
self.persistent = False
# URLs seen through 301/302 redirections
@ -146,20 +144,17 @@ class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
self.method = "HEAD"
# check for amazon server quirk
if _is_amazon(self.urlparts[1]):
self.add_info(_("Amazon servers block HTTP HEAD requests."))
if self.method_get_allowed:
self.add_info(_("Using GET method for Amazon server."))
self.method = "GET"
else:
# XXX make this a warning instead
self.add_info(_("Amazon servers block HTTP HEAD requests."))
# check the http connection
response = self.check_http_connection()
if self.headers and "Server" in self.headers:
server = self.getheader('Server')
else:
server = _("unknown")
if self.fallback_get:
self.add_info(_("Server `%(name)s' did not support HEAD request; "
"a GET request was used instead.") %
{"name": server})
# redirections might have changed the URL
self.url = urlutil.urlunsplit(self.urlparts)
# check response
@ -177,6 +172,7 @@ class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
"""
response = None
while True:
# XXX refactor this
if response is not None:
response.close()
try:
@ -240,12 +236,6 @@ class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
self.set_result(_("more than %d redirections, aborting") %
self.max_redirects, valid=False)
return response
# test unallowed method
if (response.status == 405 and self.method == "HEAD" and
self.method_get_allowed):
log.debug(LOG_CHECK, "Method HEAD unallowed, falling back to GET")
self.fallback_to_get()
continue
# user authentication
if response.status == 401:
authenticate = self.getheader('WWW-Authenticate')
@ -260,9 +250,20 @@ class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
if not self.auth:
self.construct_auth()
continue
if (self.headers and self.method == "HEAD" and
self.method_get_allowed):
# test for HEAD support
# check for fallback
if self.method == "HEAD" and self.method_get_allowed:
# 405 method unallowed
if response.status == 405:
log.debug(LOG_CHECK, "Method HEAD unallowed, falling back to GET")
self.fallback_to_get()
continue
# Some sites do not support HEAD requests, for example
# youtube sends a 404 with HEAD, 200 with GET. Doh.
if response.status >= 400:
log.debug(LOG_CHECK, "Method HEAD error, falling back to GET")
self.fallback_to_get()
continue
# Other sites send 200 with HEAD, but 404 with GET. Bummer.
poweredby = self.getheader('X-Powered-By', u'')
server = self.getheader('Server', u'')
if (poweredby.startswith('Zope') or server.startswith('Zope')
@ -275,10 +276,9 @@ class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
return response
def fallback_to_get(self):
"""Set method to GET and set fallback flag."""
"""Set method to GET and clear aliases."""
self.method = "GET"
self.aliases = []
self.fallback_get = True
def construct_auth (self):
"""Construct HTTP Basic authentication credentials if there