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Non-idempotent requests such as POST should not be pipelined. [6] Read requests like GET and HEAD can always be pipelined. A sequence of other idempotent requests like PUT and DELETE can be pipelined or not depending on whether requests in the sequence depend on the effect of others. [1] HTTP pipelining requires both the client and the server ...
[citation needed] But when the PATCH method is used, it usually involves fetching the resource from the server, comparing the original and new files, creating and sending a diff file. On the server side, the server has to read the diff file and make the modifications. This involves a lot of overhead compared to the PUT method. [11]
A sequence of idempotent subroutines where at least one subroutine is different from the others, however, is not necessarily idempotent if a later subroutine in the sequence changes a value that an earlier subroutine depends on—idempotence is not closed under sequential composition. For example, suppose the initial value of a variable is 3 ...
Similarly, a request to DELETE a certain user will have no effect if that user has already been deleted. In contrast, the methods POST, CONNECT, and PATCH are not necessarily idempotent, and therefore sending an identical POST request multiple times may further modify the state of the server or have further effects, such as sending multiple ...
Not being an expert, I believe that it should be in terms of server side effects, not client side effects. I first knew about it in terms of NFS, where reads or writes from/to a file are idempotent. Each includes the file offset. A file append operation is not idempotent, and NFS doesn't supply one.
State-based CRDTs (also called convergent replicated data types, or CvRDTs) are defined by two types, a type for local states and a type for actions on the state, together with three functions: A function to produce an initial state, a merge function of states, and a function to apply an action to update a state.
setx is idempotent because the second application of setx to 3 has the same effect on the system state as the first application: x was already set to 3 after the first application, and it is still set to 3 after the second application. A pure function is idempotent if it is idempotent in the mathematical sense. For instance, consider the ...
By looking at the endomorphism ring of a module, one can tell whether the module is indecomposable: if and only if the endomorphism ring does not contain an idempotent element different from 0 and 1. [1] (If f is such an idempotent endomorphism of M, then M is the direct sum of ker(f) and im(f).)