[MacPorts] #73380: How do I use a specific mirror?

[MacPorts]

#73380: How do I use a specific mirror?
------------------------+--------------------
 Reporter:  CGamesPlay  |      Owner:  (none)
     Type:  request     |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:
 Keywords:              |       Port:
------------------------+--------------------
 Sorry for asking a basic question. I have found the
 [https://trac.macports.org/wiki/Mirrors Mirrors list], but no directions
 on that page, or on [https://trac.macports.org/wiki/howto HOWTOs],
 [https://trac.macports.org/wiki/ProblemHotlist Problem hotlist], or
 [https://trac.macports.org/wiki/FAQ FAQ].

 How do I use a specific mirror? My problem is that my location, packages
 from https://packages.macports.org/ download at no faster than 512 KiB/s,
 despite my connection easily supporting 25 MiB/s. When I configure
 macports to use https://pek.cn.packages.macports.org/ I can easily get
 this 25 MiB/s. But macports seems to ignore that configuration most of the
 time and I can't find out why.

 I've got this in my archive_sites.conf:

 {{{
 name                    macports_archives
 urls
 https://pek.cn.packages.macports.org/macports/packages/
 }}}

 And source.conf:

 {{{
 rsync://pek.cn.rsync.macports.org/macports/release/tarballs/ports.tar
 [default]
 }}}

 No other non-comment lines in either file. When I run `port upgrade fish`,
 I see that it's downloading from `packages.macports.org` at slow speeds.
 Sometimes, but not always, I can press ^C and it will interrupt the slow
 download and retry from pek.cn, other times ^C will quit macports.

 No proxies are at play here.

 So, how do I properly *select* a mirror to use for macports? Thanks in
 advance!

-- 
Ticket URL: <https://trac.macports.org/ticket/73380>
MacPorts <https://www.macports.org/>
Ports system for macOS