curl -k
Ignore SSL error and continue processing(-K)
Server-side certificate is invalid, client-side root certificate is invalid, etc.
curl -k http://www.sample.com
curl -L
make redirect(-L)
curl -L http://www.example.com
save the downloaded data as a file
vim.tar.bz2 http://ftp2.jp.vim.org/pub/vim/unix/vim-8.1.tar.bz2
