What is the purpose of the 'If-Modified-Since' HTTP header? MCQ with Answer and Explanation

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What is the purpose of the 'If-Modified-Since' HTTP header?

A. To request a conditional GET if the resource has been modified since the date

B. To check for updates

C. To specify cache expiration

D. To set the last modified time

Answer: Option A

Solution (By JKSSB Mock Tests)

If-Modified-Since allows the client to request the resource only if it has been modified since the specified date, saving bandwidth.

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What is the function of a 'webhook'?

A. To cache static content

B. To allow one web application to notify another of events via HTTP

C. To encrypt web traffic

D. To manage DNS records

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Correct Answer: Option B

Explanation:
A webhook is a way for an app to provide real-time information to other applications by sending HTTP requests when specific events occur.

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Question #2

What does the 's' in HTTPS stand for?

A. Secure

B. Standard

C. Simple

D. System

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Correct Answer: Option A

Explanation:
HTTPS stands for HyperText Transfer Protocol Secure, indicating that communication is encrypted using SSL/TLS.

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Question #3

Which of the following is a method of web authentication that uses a combination of username and password?

A. Bearer token

B. Both Basic and Digest

C. Digest authentication

D. Basic authentication

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Correct Answer: Option B

Explanation:
Both Basic and Digest authentication are HTTP authentication schemes that rely on username/password, though they differ in security.

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