parse_http_list should split a string on commas, unless 
the commas are within a quoted-string.  (It allows only 
the "" quote, and not the single-quote, but this seems to 
follow the RFC.)

If there are not quoted-strings, it repeats the first tokens 
as part of subsequent tokens.

parse_http_list ('a,b') => ['a','a,b']
It should return ['a','b']

parse_http_list ('a,b,c') => ['a','a,b','a,b,c']
It should return ['a','b','c']


Patch:  On (cvs version) line 882, when no quote is found 
and inquote is false, reset the start position to after the 
comma.

        if q == -1:
            if inquote:
                raise ValueError, "unbalanced quotes"
            else:
                list.append(s[start:i+c])
                i = i + c + 1
                start = i            #New line
                continue

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This function doesn't deal with quoting of characters inside 
quoted-strings, either.  In particular, it doesn't deal with \", \\, 
and \, (see RFC 2616, section 2.2, quoted-pair). 

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Fixed the algorithm in Lib/urllib2.py r1.86, 1.77.2.3
Added testcase in Lib/test/test_urllib2.py r1.22, 1.19.2.1