Implement sequential and parallel URL requests

Q: Implement sequential and parallel URL requests

This question evaluates proficiency in HTTP networking, asynchronous and parallel programming (promises/futures), deduplication and order preservation, and robust error handling for I/O operations.

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Question

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You are given a list of URL strings. For each URL, send an HTTP GET request and return the responses.

Output format

Return a list of objects:

url : the requested URL
status : HTTP status code (or an error indicator if the request fails)
body : response body as text (or an error message)

Tasks

Sequential requests: Implement a function that sends requests one-by-one in the given order.
Deduplication: Update the logic so that duplicate URLs are requested only once (preserve the order of the first occurrence in the input).
Parallel requests: Update the implementation to send requests in parallel (e.g., using promises/futures) and return results for the deduplicated URL list.

Notes / assumptions

You may assume a Node.js/JavaScript environment and may use a standard HTTP client library.
Handle failures gracefully (e.g., DNS failure, timeout, non-2xx responses) and still return an entry for that URL.

Implement sequential and parallel URL requests

Quick Overview

Output format

Tasks

Notes / assumptions

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