Implement sequential and parallel URL requests

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 1. **Sequential requests:** Implement a function that sends requests **one-by-one** in the given order. 2. **Deduplication:** Update the logic so that duplicate URLs are requested only once (preserve the order of the **first occurrence** in the input). 3. **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.