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58. What does a HTTP request look like?

HTTP request is a message sent by a client to request resources from a server. It is composed of a request line, headers, and an optional message body. Here's an example of an HTTP/1.1 GET request:

GET /index.html HTTP/1.1
Host: www.example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Connection: keep-alive

In this example, the request line contains the method (GET), resource path (/index.html), and HTTP version (HTTP/1.1). The headers provide additional information about the request, such as the Host header indicating the domain name of the server, the User-Agent header indicating the browser and operating system used to make the request, and the Accept header indicating the preferred response data format. Finally, the optional message body can be included for certain request methods, such as POST.

HTTP/2 uses a binary format for the request message and includes additional features such as request multiplexing and server push.