Message 138855 - Python tracker

Hmm, I'd argue it's a bug:

  File "/usr/lib64/python2.5/urllib2.py", line 972, in get_algorithm_impls
    return H, KD
UnboundLocalError: local variable 'H' referenced before assignment

...does not say anything like:

"The digest authentication scheme you have requested is not supported"

Now, as to whether it's a bug that 'MD5-sess' isn't supported is a tougher call. The XXX indicates the intention was certainly for it to be supported...