Node.js Nginx代理或根目录，具体取决于用户代理

我有一个单页应用程序/渐进式web应用程序，我使用Nginx作为静态文件，使用以下设置为其提供服务：

server {
        listen 80;
        listen [::]:80;

        root /var/www/mydomain.com/html;

        index index.html index.htm index.nginx-debian.html;

        server_name mydomain www.mydomain;

        location / {
                sendfile           on;
                tcp_nopush on;
                sendfile_max_chunk 1m;

                tcp_nodelay       on;
                keepalive_timeout 65;

                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                try_files $uri $uri/ /index.html;
        }

}

现在，我想检查用户代理是否是，例如，Facebook crawler。在本例中，我想使用本地NodeJS服务器的代理，我对Nginx不太了解，但在谷歌搜索该问题后，我得到了以下代码：

server {
    listen 80;
    listen [::]:80;

    server_name mydomain www.mydomain;

    location / {
        try_files $uri @prerender;
    }

    location @prerender {
        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;
        }

        #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
        resolver 8.8.8.8;

        if ($prerender = 1) {

            #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
            set $prerender "localhost:3030";


            rewrite .* /$scheme://$host$request_uri? break;
            proxy_pass http://$prerender;


        }
        if ($prerender = 0) {
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            root /var/www/mydomain.com/html;
        }
    }
}

上面的代码不起作用，我不知道为什么需要任何帮助。

你能试试这个吗

server {
    listen 80;
    listen [::]:80;

    server_name mydomain www.mydomain;

    location / {
        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;
        }

        #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
        resolver 8.8.8.8;

        if ($prerender = 1) {

            #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
            set $prerender "localhost:3030";


            rewrite .* /$scheme://$host$request_uri? break;
            proxy_pass http://$prerender;


        }

        try_files $uri $uri/ /index.html;
    }
}

你能试试这个吗

server {
    listen 80;
    listen [::]:80;

    server_name mydomain www.mydomain;

    location / {
        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;
        }

        #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
        resolver 8.8.8.8;

        if ($prerender = 1) {

            #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
            set $prerender "localhost:3030";


            rewrite .* /$scheme://$host$request_uri? break;
            proxy_pass http://$prerender;


        }

        try_files $uri $uri/ /index.html;
    }
}

---

如果有人面临同样的问题，下面是对我有效的最后一个代码：

server {
    listen 80;
    listen [::]:80;

    server_name mydomain.com www.mydomain.com;

    location / {
        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;
        }

        #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
        resolver 8.8.8.8;

        if ($prerender = 1) {

            #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
            set $prerender "localhost:3030";
            proxy_pass http://$prerender;

        }

        root /var/www/mydomain.com/html;
        try_files $uri $uri/ /index.html;
    }
}

---

如果有人面临同样的问题，下面是对我有效的最后一个代码：

server {
    listen 80;
    listen [::]:80;

    server_name mydomain.com www.mydomain.com;

    location / {
        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;
        }

        #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
        resolver 8.8.8.8;

        if ($prerender = 1) {

            #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
            set $prerender "localhost:3030";
            proxy_pass http://$prerender;

        }

        root /var/www/mydomain.com/html;
        try_files $uri $uri/ /index.html;
    }
}

---

感谢您的帮助，当我使用您的代码而不做任何更改时，它根本不起作用，默认的Nginx页面总是呈现，但当我添加

root/var/www/mydomain.com/html时

在

之前尝试\u文件$uri$uri//index.html

当我从web浏览器访问它时，它工作正常，它在

/var/www/mydomain.com/html

中呈现静态文件，但当我从Facebook或谷歌爬虫访问网站时，我收到类似

error Cannot GET mydomain.com/path

之类的错误。你知道为什么吗？当爬虫访问时，它会以404响应代码进行响应网址！这个配置非常糟糕，非常糟糕。位置上下文中有多个if条件，无意义的重写规则，没有根指令。这就像一个不配置Nginx的完美例子。在部署之前，请阅读和this@miknik谢谢你，你认为如何解决这个问题？谢谢你的帮助，当我使用你的代码而不做任何更改时，它根本不起作用，默认的Nginx页面总是呈现，但当我添加

root/var/www/mydomain.com/html

在

之前尝试\u文件$uri$uri//index.html

当我从web浏览器访问它时，它工作正常，它在

/var/www/mydomain.com/html

中呈现静态文件，但当我从Facebook或谷歌爬虫访问网站时，我收到类似

error Cannot GET mydomain.com/path

之类的错误。你知道为什么吗？当爬虫访问时，它会以404响应代码进行响应网址！这个配置非常糟糕，非常糟糕。位置上下文中有多个if条件，无意义的重写规则，没有根指令。这就像一个不配置Nginx的完美例子。在部署之前，请阅读和this@miknik谢谢，你认为如何解决这个问题？