List of best mirrors for IP address 3.147.6.122, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/multiarch/pool/main/q/qtbase-opensource-src/qtbase-opensource-src_5.15.8+dfsg-7+rpi1.debian.tar.xz