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I also experience this problem, and it's repeatable.  When
trying to talk with CrossRef (www.crossref.com) server, I
get this same error.  I don't know why.  All the crossref
server does is spit back text.  It normally takes between 10
and 20 seconds to recieve all the data.  I've successfully
viewed the results with mozilla, and with wget.

I'd post the URL i'm hitting, but it's a for-pay service. 
This is the code I'm using:

...
( name, headers ) = urllib.urlretrieve( url )
...

While attempting to recieve this data, I tried doing a:

...
u = urllib.urlopen( url )
for line in u.readlines():
  print line
...

but program execution seemed to continue while the data was
being received, which is not cool.  I'm not sure if that's
expected behaviour or not.

Let me know if I can provide you with any more information.

-jon