server {
        listen       80;
        server_name  www.a.com;
        location /path/ {
            proxy_pass http://localhost:8080;
        }
}

#访问 http://www.a.com/path/index.html 实际访问的是 http://localhost:8080/path/index.html

server {
        listen       80;
        server_name  www.a.com;
        location /path/ {
            proxy_pass http://localhost:8080/;
        }
}

#访问 http://www.a.com/path/index.html 实际访问的是 http://localhost:8080/index.html
#区别只在一个/