/usr/lib/x86_64-linux-gnu/libcpprest.so is in libcpprest-dev 2.9.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcpprest.so.2.9
/usr/lib/x86_64-linux-gnu/libcpprest.so.2.9