The article explains the importance of setting a custom User-Agent header in HTTP requests, particularly when using Postman, a popular HTTP client. It highlights that the User-Agent header identifies the client making a request to a server, often including details about the client's machine and application, which servers use to discern the nature of incoming requests. Postman's default User-Agent string is distinct from typical browser strings, which can trigger anti-bot systems. The article provides instructions on how to customize or rotate the User-Agent header in Postman requests to prevent detection by anti-bot technologies, emphasizing that while these measures can reduce the risk of being blocked, advanced systems may still identify and block requests. Additionally, it suggests using a proxy or advanced scraping APIs like Web Scraper API for more robust solutions against anti-bot measures.