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The second core component is the HTTP client. PHP's cURL extension is the workhorse here, but we must configure it for concurrency. The `curl_multi_` functions allow a single process to handle multiple non-blocking transfers, but for a true pool of processes, each worker uses simple `curl_exec` within its own process. To maximize efficiency, we can combine `curl_multi` with process forking – each child process opens multiple easy handles and runs a select loop. A simplified implementation might use the `Swoole` coroutine HTTP client, which is even more efficient. Essential cURL options include: `CURLOPT_TIMEOUT` to prevent hung connections, `CURLOPT_PROXY` for proxy rotation, `CURLOPT_USERAGENT` set from a random array, and `CURLOPT_HEADER` for analyzing response headers. Importantly, a proxy pool manager is a standalone script that fetches proxies from public lists (e.g., free proxy sites or paid APIs), validates them by testing against a known endpoint, and stores working ones in Redis sorted sets with latency scores. Workers then randomly pick a proxy or use a round-robin strategy.