url 'file://%(curdir)s/linkcheck/ftests/data/base3.html'
cache key file://%(curdir)s/linkcheck/ftests/data/base3.html
real url file://%(curdir)s/linkcheck/ftests/data/base3.html
valid

url 'test.txt'
cache key file://%(curdir)s/linkcheck/ftests/data/base/test.txt
real url file://%(curdir)s/linkcheck/ftests/data/base/test.txt
baseurl file://%(curdir)s/linkcheck/ftests/data/base/
valid