Can't stop redirect to HTTPS about dinghy-http-proxy HOT 4 OPEN

# If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the
# scheme used to connect to this server
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
  default $http_x_forwarded_proto;
  ''      $scheme;
}
# If we receive Upgrade, set Connection to "upgrade"; otherwise, delete any
# Connection header that may have been passed to this server
map $http_upgrade $proxy_connection {
  default upgrade;
  '' close;
}
gzip_types text/plain text/css application/javascript application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
log_format vhost '$host $remote_addr - $remote_user [$time_local] '
                 '"$request" $status $body_bytes_sent '
                 '"$http_referer" "$http_user_agent"';
access_log off;
# HTTP 1.1 support
proxy_http_version 1.1;
proxy_buffering off;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $proxy_connection;
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 $proxy_x_forwarded_proto;
server {
  listen 80 default_server;
  server_name _;
  root /var/www/default/htdocs;
  error_page 404 /index.html;
}
upstream .db.graphite.docker {
	server 172.17.0.3:3306;
}
server {
	server_name .db.graphite.docker;
	listen 80;
	access_log /var/log/nginx/access.log vhost;
	location / {
		proxy_pass http://.db.graphite.docker;
	}
}
upstream .memcached.graphite.docker {
	server 172.17.0.4:11211;
}
server {
	server_name .memcached.graphite.docker;
	listen 80;
	access_log /var/log/nginx/access.log vhost;
	location / {
		proxy_pass http://.memcached.graphite.docker;
	}
}
upstream .nginx.graphite.docker {
	server 172.17.0.7:443;
}
server {
	server_name .nginx.graphite.docker;
	listen 80;
	access_log /var/log/nginx/access.log vhost;
	location / {
		proxy_pass http://.nginx.graphite.docker;
	}
}
upstream .web.graphite.docker {
	server 172.17.0.5:80;
}
server {
	server_name .web.graphite.docker;
	listen 80;
	access_log /var/log/nginx/access.log vhost;
	location / {
		proxy_pass http://.web.graphite.docker;
	}
}