Crash depending on cache name and url

What steps will reproduce the problem?
http = httplib2.Http("foobar")
http.request("https://api.facebook.com/method/fql.query?format=json&query=SELECT
+total_count+FROM+link_stat+WHERE+url%3D%22http%3A%2F%2Ffin.foobar.com%2Fuutiset
%2Fartikkeli.cfm%2F2011%2F08%2F20%2Ffacebookin_tykkaa-painike_saksan_lakia%22")

What is the expected output? What do you see instead?
Response, but instead:
File "__init__.py", line 1272, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "__init__.py", line 1084, in _request
    _updateCache(headers, response, content, self.cache, cachekey)
  File "__init__.py", line 397, in _updateCache
    cache.set(cachekey, text)
  File "__init__.py", line 687, in set
    f = open(cacheFullPath, "wb")
FileNotFoundError: [Errno 2] No such file or directory: 
'foobar\\api.facebook.com,method,fql.query,format=json&query=SELECT+total_count+
FROM+link_stat+WHERE+url%3D%22http%3A%2F%2Ffin.foobar.com%2Fuutiset%2Fartikkeli.
cfm%2F2011%2F08%2F2
0%2Ffacebookin_tykkaa-painike_,6a66abb64877560a53008cb0f7ffd354'

What version of the product are you using? On what operating system?
Windows XP with Python 3.3 and httplib2 0.7.7.

Please provide any additional information below.
No problems if no cache is used or the name of cache is shorter like "foo".

Original issue reported on code.google.com by fbe...@gmail.com on 24 Jan 2013 at 11:37

Attachments:

code.txt

energyd / httplib2

Crash depending on cache name and url #244