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. The status code is optional; clients cannot rely upon its use to prevent "lost update" conflicts.
On-premises: More control, less scalability
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Sales BarNoneTech. But one of the biggest buzzwords in IT also happens to be a relevant strategy for many IT departments. The idea of hosting computing resources off-premises e. That said, many IT departments still wrestle with the question of whether they want to adopt cloud computing technologies or stick with more traditional on-premises servers.