Upstream: proxy_ssl_name and proxy_ssl_server_name directives. These directives allow to switch on Server Name Indication (SNI) while connecting to upstream servers. By default, proxy_ssl_server_name is currently off (that is, no SNI) and proxy_ssl_name is set to a host used in the proxy_pass directive.

au BufRead,BufNewFile *.nginx set ft=nginx
au BufRead,BufNewFile */etc/nginx/* set ft=nginx
au BufRead,BufNewFile */usr/local/nginx/conf/* set ft=nginx
au BufRead,BufNewFile nginx.conf set ft=nginx