Submit a Pull Request Report a Bug. Want to remove a cookie? Many people do it the complicated way: setcookie 'name', 'content', time ; But why do you make it so complicated and risk it not working, when the client's time is wrong? Why fiddle around with time ; Here's the easiest way to unset a cookie: setcookie 'name', 'content', 1 ; Thats it.
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Whenever a resource conflict would be caused by fulfilling the request. Duplicate entries and deleting root objects when cascade-delete is not supported are a couple of examples. Slein, J. Reliable, interoperable negotiation of Upgrade features requires an unambiguous failure signal. The Upgrade Required status code allows a server to definitively state the precise protocol extensions a given resource must be served with. Its typical use is to avoid the "lost update" problem, where a client GETs a resource's state, modifies it, and PUTs it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict. By requiring requests to be conditional, the server can assure that clients are working with the correct copies.