A fully tested, abstract interface to creating OAuth clients and servers.
'multi': '%5B%27FOO%27%2C+b%27BAR%27%5D'
str([b'FOO', b'BAR])
elt
[b'FOO', b'BAR']
'[b\\'FOO\\', b\\'BAR\\']'
multi
/foo/bar?foo[]=bar&foo[]=baz&foo[]=qux
/foo/bar?foo=bar&foo=baz&foo=qux