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这个小技巧还是非常实用的，我找了好些帖子实际上都是说的是 Apache 2.2，所以一直没成功，甚至有些怀疑自己了，这么简单的东西就是不起作用。最后发现的问题所在，下面记录下来。

yum install httpd
vim /etc/httpd/conf/httpd.conf

修改内容有：

DocumentRoot "/download"
# 要共享的目录

<Directory "/download">
    # 目录的设置访问设置就两条
    # Possible values for the Options directive are "None", "All",
    # or any combination of:
    #   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
    #
    # Note that "MultiViews" must be named *explicitly* --- "Options All"
    # doesn't give it to you.
    #
    # The Options directive is both complicated and important.  Please see
    # http://httpd.apache.org/docs/2.4/mod/core.html#options
    # for more information.
    #
    Options Indexes

    #
    # AllowOverride controls what directives may be placed in .htaccess files.
    # It can be "All", "None", or any combination of the keywords:
    #   Options FileInfo AuthConfig Limit
    #

    #
    # Controls who can get stuff from this server.
    #
    Require all granted
</Directory>

在这个例子中，所有的请求是允许的。我是走了好些弯路，有好些配置都是 Apache 2.2 中的，所以要改成 Apache 2.4 的才行。

2.2 配置：

Order allow,deny
Allow from all

2.4 配置：

Require all granted

最后重启 httpd：

systemctl restart httpd

再去登录 127.0.0.1 或 IP 地址，就能看到文件列表了。