### section 2: 'main' server configuration
#第二部分：主服务配置
# the directives in this section set up the values used by the 'main'
# server, which responds to any requests that aren't handled by a
# <virtualhost> definition. these values also provide defaults for
# any <virtualhost> containers you may define later in the file.
#本节中指令的设置值，将被主服务所使用，主服务响应那些没有被<virtualhost>所处理的请求，这些值也为<virtualhost>容器提供了默认值，你可以在后面的文件中定义
# all of these directives may appear inside <virtualhost> containers,
# in which case these default settings will be overridden for the
