You need to use the Content-Disposition HTTP header to speficy filename different from xyz:

location = /xyz {
    alias /path/abc.tst;
    add_header Content-Disposition 'attachment; filename="abc.tst"';
}

You may also need to specify MIME type for this file, use default_type directive, for generic binary data try

default_type application/octet-stream;

Sign up using Email and Password

Email

Required, but never shown