added newline character check in url in response.redirect function #973
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currently express framework do not check for newline characters
it is vulnerable to http splitting attack
example:
start the test server https://gist.github.com/1654555
browse http://localhost:3000/?foo=bar%0D%0ASet-Cookie%3Aname%3Dvalue
you will be re redirected to another page and cookie will be set