The HTTP method used to update an existing resource in REST is:

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BlackTom AI · Accepted Answer

The question asks about which HTTP method is used to update an existing resource in REST.
Option a) GET: This method is used to retrieve or read a resource, not to modify it, so it’s inappropriate for updating.
Option b) PUT: This method is designed for updating an existing resource or creating it at a known URI if it doesn’t exist. In REST, PUT is idempotent, meaning repeated requests have the same effect as a single one, which aligns with the idea of updating an existing resource.
Option c) POST: While POST can create a new resource or trigger a processing operation, it is not the standard method for updating an existing resource; it is generally non-idempotent and not used for replacing resources at a known URI.
Option d) DELETE: This method removes a resource, not updates it, so it does not serve the purpose of updating.
In summary, the updating operation in REST is typically performed with PUT (or PATCH for partial updates in some designs), whereas GET reads, POST creates, and DELETE removes.

The HTTP method used to update an existing resource in REST is:

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