[Request]: Document how to set mirror manually

[soiamsoNG]

Tell us the problem or your need

proxy.usebottles.com guide me to rjtt.mirror.usebottles.com but most part of my country can not access.

But I can access mirror.usebottles.com

below is ping result from https://ping.chinaz.com/

Describe the solution you'd like

List all mirrors in the document. Document how to set mirror manually, a way not via proxy.usebottles.com

Other solutions?

Rewrite proxy.usebottles.com rule, guide to an accessible server like mirror.usebottles.com

Additional context and references

No response