nginx consists of modules which are controlled by directives specified in the configuration file. Directives are divided into simple directives and block directives. A simple directive consists of the name and parameters separated by spaces and ends with a semicolon (;). A block directive has the same structure as a simple directive, but instead of the semicolon it ends with a set of additional instructions surrounded by braces ({ and }).
If a block directive can have other directives inside braces, it is called a context (examples: events, http, server, and location).
Directives placed in the configuration file outside of any contexts are considered to be in the main context.
- The events and http directives reside in the main context
- server in http
- and location in server.
The rest of a line after the # sign is considered a comment.
