canary环境使用nginx实现原理分析

upstream canary_dev {
  server 192.168.0.1:8080;
}
upstream canary_local {
  server 192.168.0.2:8080;
}

server {
	listen 80;
	server_name localhost;

	location / {
		add_header content-type 'text/html; charset=utf-8';
		proxy_set_header host $http_host;
		
		if ( $http_canary = 'local') {
			proxy_pass http://canary_local;
		}
		if ( $cookie_canary = 'local') {
			proxy_pass http://canary_local;
		}

		proxy_pass http://canary_dev;
		
	}

}