api.conf

server {
  listen 8080;
  access_log off;
  
  location /api {
    api;
  }
  location = /dashboard.html {
    root /usr/share/nginx/html;
  }
  location / {
    return 302 /dashboard.html;
  }
}

differentPath.conf

upstream sd1 {
  zone SD1 64k;
  server 10.10.220.1:80;
  server 10.10.220.2:80;
}
server {
  listen 80;
  server_name nginxdev.foo.com;
  status_zone nginxdev.foo.com;
  
  location / {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_http_version 1.1;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://sd1;
  }
  location /servicedesk {
    proxy_set_header Host $host;
    proxy_http_version 1.1;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://sd1/foo;
  }
}

differentUpstream.conf

upstream sd1 {
  zone SD1 64k;
  server 10.10.220.1:80;
  server 10.10.220.2:80;
}
upstream sd2 {
  zone SD2 64k;
  server sd2.foo.com;
}

server {
  listen 80;
  server_name nginxdev.foo.com;
  status_zone nginxdev.foo.com;
    
  location / {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_http_version 1.1;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://sd1;
  }
  location /servicedesk {
    proxy_set_header Host $host;
    proxy_http_version 1.1;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://sd2;
  }
}