# Preserve the original Host header, including a non-default port, because many
# upstream frameworks use it when generating absolute URLs.
proxy_set_header	Host	$http_host;

# Keep the de-facto standard X-Forwarded-* headers and the older Scheme header
# together. Some upstreams still read Scheme while newer ones prefer
# X-Forwarded-Proto.
proxy_set_header	Scheme	$scheme;
proxy_set_header	X-Real-IP	$remote_addr;
proxy_set_header	X-Forwarded-Host	$host;
proxy_set_header	X-Forwarded-Proto	$scheme;

# Preserve WebDAV and object-storage style Destination requests when proxying.
proxy_set_header	Destination	$http_destination;
proxy_set_header	X-Forwarded-Server	$host;
proxy_set_header	X-Forwarded-For	$proxy_add_x_forwarded_for;

# Leave this legacy hint in place because some older applications and middleware
# still branch on it when they know they are behind nginx.
proxy_set_header	X-NginX-Proxy	true;

# Avoid rewriting Location headers implicitly. Callers can add explicit
# proxy_redirect rules locally if an upstream really needs them.
proxy_redirect	off;