An Etag header is included in the HTTP response for an API resource.
What are two benefits of using the value of the Etag for future interactions involving the same API resource? (Choose two.)
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A. B. C. D. E.AB.
The Etag header is a response header in the HTTP protocol that provides a mechanism for clients to perform conditional requests for resources. When a client makes a request for a resource, the server responds with the resource's current Etag value, which represents the current state of the resource on the server.
Here are two benefits of using the value of the Etag for future interactions involving the same API resource:
Caching and optimization of response payloads: When a client requests a resource, it can store the Etag value received in the response. If the client needs to request the same resource again, it can include the Etag value in the request header. The server can then compare the Etag value in the request with the current Etag value of the resource on the server. If they match, the server can respond with a 304 Not Modified status code, indicating that the client's cached copy of the resource is still valid. This can help reduce network traffic and improve performance by avoiding the transfer of duplicate data.
Creating conditional requests: The Etag value can also be used to create conditional requests for a resource. The client can include the Etag value in the If-Match or If-None-Match request header to specify that the request should only be processed if the Etag value of the resource on the server matches or does not match the Etag value in the header. This can be useful in scenarios where the client wants to update a resource only if it has not been modified since the client last retrieved it.
Therefore, options A (caching and optimization of response payloads) and B (creating conditional requests) are the two benefits of using the value of the Etag for future interactions involving the same API resource.
Option C (categorizing and comparing this API resource with others) and option E (requesting the list of operations authorized for this resource) are not related to the use of Etag values. Option D (checking the integrity of the resource) is partially correct, but it is not a specific benefit of using Etag values for future interactions.