This file is indexed.

/etc/nginx/proxy_params is in nginx-common 1.10.3-1+deb9u2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;