We want to use Nginx as LB in a way so that Nginx can return 301 or 302 redirect to client instead of Proxying request to backend/upstream servers.

It is required as Server which is configured as LB is having limited throughput of 1 Gbps while upstream servers are having throughput of 10Gbps .

We want users to directly connect to Upstream Server for Data delivery.
Nginx LB Server to make sure that all upstream are up and functional before giving 301 or 302 redirect to any of upstream server

Example:

http://nginxlb.com/data/download

Nginx LB Returns Redirected URL to Client 301 or 302 ( That upstream should be up)

http://upstreamserver1.com/data/download
http://upstreamserver2.com/data/download

Is this possible by :

return 301 http://$upstream_addr/data/download