Deleting cookies in Lift

Are you having trouble deleting a cookie from Lift? I burned too much time yesterday night tracking down this lift bug (which was compounded by a bug in Chrome's developer window).  I am documenting my experience here so maybe the next person to encounter this will get more sleep than I got.



For instance, if you used the following to set a cookie:

S.addCookie(HTTPCookie("name", Full("value"), Full(".photopoly.ca"), Full("/"), Full(86400), Empty, Empty))

and later you tried to delete this cookie:

S.deleteCookie("name")

Then you would be disappointed with the result.  You'd also be disappointed if you tried

S.findCookie("name").map(S.deleteCookie)

I worked around the problem by explicitly adding a new cookie to wipe out the old cookie (which is basically what S.deleteCookie does -- but the secret is to pass in the same path and domain you used to set the cookie):

S.addCookie(HTTPCookie("name", Full(""), Full(".photopoly.ca"), Full("/"), Full(0), Empty, Empty))

Maybe a future version of Lift will have

S.deleteCookie(name: String, domain: Box[String], path: Box[String])