How does WeChat Mini Programs access the server and download files on the server?

I have a server, and the domain name is bound and can be accessed, but I don"t know how to let WeChat Mini Programs access the server? I"m a novice, and I don"t know much about it. I hope you will not begrudge your advice.

Mar.14,2021
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-64f5-1b38ed3-406dd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38ed3-406dd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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