Each time you visit a web page, a bureaucratic exchange takes place between your computer’s web browser and a distant web server. Your web browser (called the “client”) begins the exchange by submitting a request to the web server for code, images, and other information. The web server, always on the alert, returns a tiny message that says, “I received your request and here is what you can expect in the next few moments.” This tiny message, including a server response code, is helpful to both the waiting client and human beings optimizing the experience