Apache 2.4 reverse proxy home page successful, reverse proxy secondary directory 403 forbidden You don't have permission

currently I try to reverse proxy one of the secondary directories of one of my discuz stations
when I am testing, the home page can be successfully reverse proxied out. The httpd-vhosts.conf code is as follows:

Include / usr/local/apache/conf/vhost/*.conf
< VirtualHost *: 80 >
ServerName localhost
ServerAlias localhost
DocumentRoot / data/www/default
< Directory / data/www/default >

SetOutputFilter DEFLATE
Options FollowSymLinks
AllowOverride All
Order Deny,Allow
Require all granted
DirectoryIndex index.php index.html index.htm

< / Directory >
< / VirtualHost >

< VirtualHost 45.123.xxx.xxx:80 >
ServerAdmin jfscou@outlook.com
DocumentRoot / data/www/xxx.com
ServerName 45.123.xxx.xxx
ServerAlias 45.123.xxx.xxx
ProxyPreserveHost On
ProxyPass /
ProxyPassReverse /
http://xxx.com/

but when I try to proxy the secondary directory, I will get the error that the permissions are less than 403, and I can"t even open the home page of the website.
httpd-vhosts.conf code is as follows:

Include / usr/local/apache/conf/vhost/*.conf
< VirtualHost *: 80 >
ServerName localhost
ServerAlias localhost
DocumentRoot / data/www/default
< Directory / data/www/default >

SetOutputFilter DEFLATE
Options FollowSymLinks
AllowOverride All
Order Deny,Allow
Require all granted
DirectoryIndex index.php index.html index.htm

< / Directory >
< / VirtualHost >

< VirtualHost 45.123.xxx.xxx:80 >
ServerAdmin jfscou@outlook.com
DocumentRoot / data/www/xxx.com
ServerName 45.123.xxx.xxx
ServerAlias 45.123.xxx.xxx
ProxyPreserveHost On
ProxyPass / 2015
ProxyPassReverse / 2015
http://xxx.com/

I don"t know what"s wrong with the reverse proxy of the secondary directory?
I also hope you can give me some advice

.
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b331e4-3421a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b331e4-3421a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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