Http is an application layer protocol designed for client-server communication and can be made analogy as a kind of mail service simply with the following features: Request line; identifies the resource called. Http header ; contains operating information about the message such as destination, content type and etc. in the form of key-value pairs. Payload or body; is the part that the actual message is contained. HTTP protocol is comprised of commands/verbs such as GET, POST, PUT.. GET https://www.google.com/ HTTP/1.1 Host: www.google.com Connection: keep-alive Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) Chrome/71.0.3578.98 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8 Accept-Encoding: gzip, deflate, br Accept-Language: tr-TR,tr;q=0.9,en-US;q=0.8,en;q=0.7 Cookie: SID=awcwAWJ-Py1UHfnKSWSzREE01k4qY45amv6.. History of HTTP by Versions The initial versio