nginx 服务静态 html 和代理

Question

我在 Digital Ocean 上有一个 droplet，我用它来托管一个网站和一个 API 用于该网站。

我愿意：

https://example.com 为网站提供服务
https://example.com/api 在端口 3000 上为 API、运行提供服务。

这是我的 /etc/nginx/nginx.conf 文件：

http {
        include /etc/nginx/mime.types;
        default_type application/octet-stream;

        log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

        access_log  /var/log/nginx/access.log  main;
        error_log /var/log/nginx/http-error.log;

        sendfile            on;
        tcp_nopush          on;
        tcp_nodelay         on;
        keepalive_timeout   65;
        types_hash_max_size 2048;

        server { 
                server_name example.com; # managed by Certbot 

                listen [::]:443 ssl ipv6only=on; # managed by Certbot 
                listen 443 ssl; # managed by Certbot 

                # SSL settings

                ssl_certificate /path/to/file.pem; # managed by Certbot 
                ssl_certificate_key /path/to/file.pem; # managed by Certbot 
                include /path/to/file.conf; # managed by Certbot 
                ssl_dhparam /path/to/file.pem; # managed by Certbot 

                proxy_http_version 1.1; 
                proxy_set_header Connection 'upgrade';
                proxy_set_header Host $http_host; 
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header X-Forwarded-For $remote_addr; 
                proxy_set_header X-Real-IP $remote_addr; 

                proxy_cache_bypass $http_upgrade;

                proxy_redirect off;

                # Routes

                location /api/ { 
                        proxy_pass http://127.0.0.1:3000/; 
                } 

                location / { 
                        root /usr/share/nginx/html; 
                } 

                error_page 404 /404.html; 
                location = /40x.html {}

                error_page 500 502 503 504 /50x.html; 
                location = /50x.html {}
        } 

        server { 
                if ($host = example.com) { 
                        return 301 https://$host$request_uri; 
                } # managed by Certbot 

                listen       80 ; 
                listen       [::]:80 ; 
                server_name example.com; 
                return 404; # managed by Certbot 
        } 
}

提供静态 html 文件效果很好，但 https://example.com/api/ returns 出现 502: Bad Gateway 错误。我不明白我做错了什么......任何帮助将不胜感激。谢谢。

Answer 1

location / {
    proxy_set_header  X-Real-IP  $remote_addr;
    proxy_set_header  Host       $http_host;
    proxy_pass        http://127.0.0.1:3000;
  }

这通常不会让我失望。请尝试。

Answer 2

原来我的配置完全没问题。我只需要在 Droplet 上启用网络。我使用 this post 来这样做。谢谢大家！

简而言之：

setsebool httpd_can_network_connect on

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