认识
文档：https://nginx.org/en/docs/http/ngx_http_log_module.html
The ngx_http_log_module module writes request logs in the specified format.
Requests are logged in the context of a location where processing ends. It may be different from the original location, if an internal redirect happens during request processing.
日志
Nginx/Configuring Logging
Nginx/Module ngx_http_log_module
Nginx 的日志功能能是由 ngx_http_log_module 模块提供；