What synchronization challenge does the article encounter when building a periodic HTTP client in Node.js, and how is it resolved?

Node.js is asynchronous by nature, so a simple `while` loop with a `sleep` function does not work because HTTP requests are non-blocking and callbacks are deferred. The article solves this by using method nesting: after a request completes (or after a timeout), the next request is called recursively, ensuring sequential execution. This approach avoids the need for third-party modules like `async`. For more on bypassing logs during persistence, see Penetration Basics - Bypassing SSH Logs.