http Status Code 304

解决的问题： 要防止网站根路径被缓存并返回304状态码

server {
    listen 443 ssl;
	...

	# 根路径的location块
    location = / {
        proxy_set_header   Host $host;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        root  www;
        index  index.html index.htm;
        try_files $uri $uri/ /index.html last;

        # 禁止缓存以及304响应
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
    }
}