The infrastructure seems a bit lacking, don’t you think?
The URL https://mirrors.openeuler.org/metalink?repo=20.03LTS_SP4/EPOL/main&arch=x86_64 is very hard to access directly—it often times out. But with a proxy, it opens instantly.
The forum is also slow, and the official website sometimes lags too. Can you please pay more attention to this?
If it’s too difficult, then just don’t bother.