Apache performs reverse proxy based on parameters

there is a parameter An in the request parameters. Now you need to configure the Apache reverse proxy. If you want to send B, you will go to one address, otherwise you will go to another address. How can you configure it?

Httpd apache
Mar.04,2021

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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-64f5-1b386fa-2c12a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b386fa-2c12a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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