what is http options used for code example

Example 1: what is Http

Http Stands for "Hypertext Transfer Protocol."
HTTP is the protocol used to transfer data over the web.
It is part of the Internet protocol suite and defines commands and services used
for transmitting webpage data. ... The HTTP server is typically a web host 
running web server software, such as Apache or IIS.

Example 2: what is http request made of

1-Http request methods : PUT, POST, DELETE,GET
2-Base URI
3-Resources and Parameters
4-Request Header(which carries metaData)as keyValue pair
5-Request Body