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API Request Methods Mastery Hub: The Industry Foundation Pra

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Q1Domain Verified
Within the context of RESTful APIs and HTTP methods, which of the following best describes the idempotency of the PUT method?
PUT requests are inherently idempotent due to their ability to retrieve resource representations, making them safe to re-execute without side effects on the resource's state.
A PUT request is idempotent because it is designed to create a new resource if it doesn't exist or update an existing one to a specific state, and repeated identical requests will not change the resource's state beyond the initial successful application.
Idempotency for PUT means that the server will only process the first PUT request and subsequent identical requests will be rejected with a 409 Conflict error.
A PUT request, when executed multiple times with the same parameters, will result in different states of the resource on the server with each subsequent request.
Q2Domain Verified
Consider a scenario where a client needs to partially update a resource. Which HTTP method is *most* appropriate and aligned with RESTful principles for this operation, and why is it preferred over others in this specific context?
GET, as it's used to retrieve resource state, and a client could theoretically construct a GET request to trigger a partial update through server-side logic.
PATCH, because it's explicitly designed for applying partial modifications to a resource, ensuring that only the specified fields are altered without affecting others.
POST, because it's a general-purpose method for actions that don't fit other HTTP verbs, and partial updates can be considered a specific "action."
PUT, as it can be used to update resources, and the client can simply send the fields that need to be changed.
Q3Domain Verified
In a RESTful API designed for managing user profiles, a client sends a DELETE request to `/users/123`. If the user with ID `123` has already been deleted by another client, what is the *most* appropriate HTTP status code the server should return, and what does it signify in terms of the API's state?
200 OK, indicating that the request was successful and the user is now definitively removed.
204 No Content, signifying that the request was processed, but there's no content to return, implying the user is no longer present.
410 Gone, indicating that the requested resource has been permanently removed and is unlikely to be available again.
404 Not Found, indicating that the target resource (the user with ID `123`) could not be located on the server.

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