In HTTP, what is the primary use of the ETag response header?To provide a mechanism for cache validation.To indicate the content encoding of the response body.To specify the allowed HTTP methods for the resource.To set a cookie in the client's browser.
Question
In HTTP, what is the primary use of the ETag response header?To provide a mechanism for cache validation.To indicate the content encoding of the response body.To specify the allowed HTTP methods for the resource.To set a cookie in the client's browser.
Solution
The primary use of the ETag response header in HTTP is to provide a mechanism for cache validation. This means it is used to determine whether a cached version of the requested resource is up-to-date. If the ETag of the requested resource matches the ETag stored in cache, the server will return a 304 Not Modified status, indicating that the client can use the cached version of the resource. If the ETags do not match, the server will return the requested resource along with its current ETag in the response header.
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