com/servizi/": the browser reads httpsand understands that we want to access a web resource in a secure manner reads doesn't know what the IP address is , so it asks the DNS server “Where is DNS server responds “is on 46.28.2.13” the browser sends 46.28.2.13the request “I would like to access” the web server 46.28.2.13receives theto the browser chad business email list the browser receives the response and displays it to the user Client-Server Answer The web response is characterized by a multitude of information, divided into two main sections: Header Contains additional information, including: date and time of response response language status code Body The actual content of the response, consisting of: text and structure part (HTML) stylistic part (CSS) interaction part (JS) resources (images, audio, video) The status code inside the header indicates whether the request was successful, if there was an error, if you can try again, or if the service is unavailable.
In general, an HTTP status code is a 3-digit number, with the first digit representing the category: 2xx Everything is fine 3xx The requested resource is no longer here, try this other side 4xx There is a problem with your request 5xx There is a server side problem Status codes are standard and browsers know what to do in each situation. There is even a status code 418 which means I am a teapot , which means that the server refuses to serve coffee because it is actually a teapot! Born as an April Fool's joke in 1998, it never officially entered the standards, but many browsers have implemented it anyway