[issue2695] Ignore case when checking algorithm in urllib2

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Whoops, just checked the title.
Function is about 2/3rds down in urllib2.
comments still apply 

Note 4: I consider 'name = lambda ...' inferior to 'def name...'
but I am not the one who will edit this.

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