350-901 Question #11: Real Exam Question with Answer & Explanation

Question

The response from a server includes the header ETag: W/"7e0808a419e371767916ef1360d8e83d". Which statement is true?

Options

• AThe ETag has a Strong validator directive.
• BThe ETag has a Weak validator directive, which is an optional directive.
• CThe ETag has a Weak validator directive, which is a mandatory directive.
• DThe ETag has a Strong validator directive, which it is incorrectly formatted.

Explanation

An ETag prefixed with W/ indicates a weak validator, and the W/ prefix itself is optional per RFC 7232.

Common mistakes.

• A. The absence of W/ indicates strong validation; the W/ prefix explicitly marks this as weak.
• C. The W/ prefix is optional, not mandatory - a server can choose whether to send weak or strong ETags.
• D. The ETag is correctly formatted as a weak validator with the W/ prefix followed by a quoted string.

Concept tested. HTTP ETag weak vs strong validator directives

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

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