Nginx reverse proxy, instruct use of unix sockets

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http://serverfault.com – My Nginx reverse proxy works on the same machine as the webserver(apache) as follows server { server_name site.net; location / { proxy_pass http://localhost:82; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; } } Now instead of using TCP connections to the backend apache, how can I tune it to use unix sockets? (HowTos)