Which statement is true?

The response from a server includes the header ETag: W/”7eb8b94419e371767916ef13e0d6e63d”.

Which statement is true?
A . The ETag has a Strong validator directive.
B . The ETag has a Weak validator directive, which is an optional directive.
C . The ETag has a Weak validator directive, which is a mandatory directive.
D . The ETag has a Strong validator directive, which it is incorrectly formatted.

View Answer

Answer: B

Explanation:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag

The ETag HTTP response header is an identifier for a specific version of a resource. It lets caches be more efficient and save bandwidth, as a web server does not need to resend a full response if the content has not changed. Additionally, etags help prevent simultaneous updates of a resource from overwriting each other Syntax:

ETag: W/"<etag_value>"

Directives:

W/ (Optional)

‘W/’ (case-sensitive) indicates that a weak validator is used. Weak etags are easy to generate, but are far less useful for comparisons. "<etag_value>"

Entity tag uniquely representing the requested resource. They are a string of ASCII characters placed between double quotes, like "675af34563dc-tr34"