Issue with unescaping parts of the query string that shouldnt be unescaped

[ferozed]

I have a url of the form:

http://foo.com?foo=bar&Signature=0hSCasjYRSCxi3fumzRMhHTa%2BV0%3D

If I do a url.parse().unescape.utf8() on it it becomes...

>>> u = url.parse('https://foo.com?foo=bar&Signature=0hSCasjYRSCxi3fumzRMhHTa%2BV0%3D')
>>> u.unescape().utf8()
'https://foo.com/?foo=bar&Signature=0hSCasjYRSCxi3fumzRMhHTa%2BV0%3D'

which is correct, because the query part should not be unescaped.

However, if I take this url, and try to escape it, it becomes invalid...

>>> url.parse(u.unescape().utf8()).escape().utf8()
'https://foo.com/?foo=bar&Signature=0hSCasjYRSCxi3fumzRMhHTa+V0='

It is unescaping when calling escape().

I was expecting the original url to come back.