Caching 如何在nginx中为预渲染服务器设置条件代理缓存

我在angular中有一个前端渲染应用程序，需要我们下面的机器人能够抓取。我让它在没有缓存的情况下工作，但是当想要添加缓存时，conf文件是无效的。我已经尝试寻找这个方法太久了，现在无法想出一个解决方案。似乎无法在if语句中设置代理缓存。那么我的选择是什么呢？或者我是不是走错了方向

server {
    server_name IP;
    add_header X-Cache $upstream_cache_status;

    location / {
        access_log off;

        set $prerender 0;
        if ($http_user_agent ~* "baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest|slackbot|vkShare|W3C_Validator") {
            set $prerender 1;
        }
        if ($args ~ "_escaped_fragment_") {
            set $prerender 1;
        }
        if ($http_user_agent ~ "Prerender") {
            set $prerender 0;
        }
        if ($uri ~ "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff)") {
            set $prerender 0;
        }

        if ($prerender = 1) {
            proxy_cache one;
            proxy_cache_valid 200 30m;
            proxy_cache_valid 404 1m;
            proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
            proxy_ignore_headers Set-Cookie;
            proxy_hide_header Set-Cookie;
            proxy_hide_header X-powered-by;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            expires 10m;
            proxy_http_version 1.1;
            rewrite .* /$scheme://$host$request_uri? break;
            proxy_pass http://localhost:3000; #my prerender node server
        }
        if ($prerender = 0) {
            root /my/static/stuff;
            expires max;
        }
    }

}

---

我差点忘了我问了这个问题，直到有人投了赞成票。 由于nginx中if情况的限制，我最终解决了这个问题

在nginx.conf中

proxy_cache_path  /var/cache/nginx levels=1:2 keys_zone=prerender:60m max_size=200m inactive=30000m;
upstream prerender_upstream {
    server 127.0.0.1:3000;
    keepalive 64;
}

在您的站点配置中

server {
    server_name IP;
    add_header X-Cache $upstream_cache_status;

    location /prerender/ {
        access_log off;
        proxy_cache prerender;
        proxy_cache_valid 200 60s;
        proxy_cache_valid 404 60s;
        proxy_pass http://prerender_upstream/;
        proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
        proxy_ignore_headers Set-Cookie;
        proxy_hide_header Set-Cookie;
        proxy_hide_header X-powered-by;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        expires 60s;
        proxy_http_version 1.1;
    }

    location / {
        access_log off;

        set $prerender 0;
        if ($http_user_agent ~* "baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest|slackbot|vkShare|W3C_Validator") {
            set $prerender 1;
        }
        if ($args ~ "_escaped_fragment_") {
            set $prerender 1;
        }
        if ($http_user_agent ~ "Prerender") {
            set $prerender 0;
        }
        if ($uri ~ "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff)") {
            set $prerender 0;
        }

        if ($prerender = 1) {
            rewrite .* /$scheme://$host$request_uri? break;
            proxy_pass http://$host/prerender/http://$host$request_uri;
        }
        if ($prerender = 0) {
            root /my/static/stuff;
            expires max;
        }
    }

}

---

它工作得非常好。希望这对某人有所帮助。

谢谢。这仅适用于prerender还是meteor服务的所有文件？根据本文：。如果在位置上下文中，唯一可以在内部执行的100%安全操作是返回和重写。我怀疑代理传递if块是否始终有效。