Fetch a list of URLs in parallel and return responses

Change the URL fetching from sequential to parallel execution. Requirements Input: a list of URLs. Behavior: send HTTP GET requests in parallel. Output: a list of results. If order preservation is required, the output must match the input order even if responses arrive out of order. Tolerate per-request failures; one failure must not fail the whole batch. Optional bonus: enforce a concurrency limit k (e.g., at most 5 in-flight requests). Constraints 1 ≤ n ≤ 200 Optional: 1 ≤ k ≤ 20 Example Input: [A,B,C] Output: 3 results ordered as A,B,C (if order is required). Example Input (mock) ["/slow","/fast"] Output 2 results; if ordered output required then [/slow,/fast] order preserved