将/AAAA/BBBB/X代理到http://abc.com/X
location ~ /AAAA/BBBB(/.*) {
set $query $1;
proxy_pass http://abc.com/$query;
proxy_set_header Host abc.com;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}