Nginx 主从兜底配置

nginx-fallback.conf

server {

	listen 80;
	listen 443 ssl http2;
	server_name demo.domain.com;
	index index.php index.html index.htm default.php default.htm default.html;
	root /www/wwwroot/demo.domain.com;

	recursive_error_pages on;
	proxy_intercept_errors on;


	location / {

		error_page 418 = @backend;
		return 418;
	}

	location @backend {

		# 优先请求
		proxy_pass http://proxy.domain.com:20220; # homelab 公网
		proxy_set_header Host demo.domain.com;
		proxy_set_header X-Forwarded-For $remote_addr;
		proxy_set_header X-NginX-Proxy true;
		proxy_http_version 1.1;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection "upgrade";
		error_page 404 500 502 = @handle_fallback;

	}

	location @handle_fallback {

		# 兜底请求
		proxy_pass http://demo.frp.domain.com:4080; # homelab frpc 穿透
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header Host demo.frp.domain.com:80;
		proxy_set_header X-NginX-Proxy true;
		proxy_http_version 1.1;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection "upgrade";
		error_page 451 = @backend; # 重新请求
	}

}