Some ReST operations must be idempotent, as applying them twice must
have the same effect on the resources as applying them once. Among the
following, which http methods implement idempotent operations?

Question

Some ReST operations must be idempotent, as applying them twice must 
have the same effect on the resources as applying them once.  Among the 
following, which http methods implement  idempotent operations?

Answer

DELETE of a non existing resource.

Answer

DELETE of an existing resource.

Answer

PUT changing an existing resource.

Answer

POST creating a new resource.

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Some ReST operations must be idempotent, as applying them twice must have the ...

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