Hypertext Transfer Protocol (HTTP) is a communication protocol between client computers and web servers. A web browser such as Chrome, Safari, or Firefox can be the web client or the user-agent, while a web application on a computer that's listening on some port can be the web server. Web clients are not only browsers but any application that can speak to the web server, such as cURL or Telnet.
A client opens a connection via the internet to make a request to the server and waits until they receive a response from the server. The request contains request information, while the response contains status information and the requested content. These two types of exchanged data are called HTTP messages. They are just bodies of text encoded in ASCII and they span multiple lines in the following structure:
Start-line
HTTP Headers
Body
This looks very simple and straightforward, doesn't it? Although this may be the case, let's elaborate on this...
