我正在尝试为NodeJS应用程序安装一个新的Nginx反向代理。我在过去做过几次，经过几个小时的比较不同的配置，一切似乎都是一样的，但一个工作，另一个显示页面：
欢迎来到nginx！如果您看到此页面，nginx Web服务器已成功安装并工作。需要进一步配置”
我使用的是EC2示例，我使用以下命令安装了nginx：

sudo yum update -y
sudo yum install nginx

默认情况下，既没有可用的站点目录，也没有启用站点的目录。我直接在conf.d中配置了另一个服务器（出于测试目的）。sudo vim /etc/nginx/conf.d/testing.api.example.com
我写了如下配置：

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        server_name testing.api.example.com;

        location / {
                    proxy_pass http://127.0.0.1:8082;
                    proxy_set_header Host $host;
                    proxy_set_header X-Real-IP $remote_addr;
                    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                    proxy_set_header X-Forwarded-Proto $scheme;

            }
}

我启动了nginx：

sudo nginx -t
sudo systemctl restart nginx

我在服务器上运行一个测试，看看服务器是否在运行：

$ curl 127.0.0.1:8082
Hello Node!

NodeJS服务器运行正常。
但是当调用端口80作为反向代理时，我得到了默认的“欢迎来到nginx！”页。
看起来nginx.conf文件包含conf.d文件夹：

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log notice;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

http {
    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;

    sendfile            on;
    tcp_nopush          on;
    keepalive_timeout   65;
    types_hash_max_size 4096;

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

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80;
        listen       [::]:80;
        server_name  _;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

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

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

# Settings for a TLS enabled server.
#
#    server {
#        listen       443 ssl http2;
#        listen       [::]:443 ssl http2;
#        server_name  _;
#        root         /usr/share/nginx/html;
#
#        ssl_certificate "/etc/pki/nginx/server.crt";
#        ssl_certificate_key "/etc/pki/nginx/private/server.key";
#        ssl_session_cache shared:SSL:1m;
#        ssl_session_timeout  10m;
#        ssl_ciphers PROFILE=SYSTEM;
#        ssl_prefer_server_ciphers on;
#
#        # Load configuration files for the default server block.
#        include /etc/nginx/default.d/*.conf;
#
#        error_page 404 /404.html;
#        location = /404.html {
#        }
#
#        error_page 500 502 503 504 /50x.html;
#        location = /50x.html {
#        }
#    }

}

我试过几次改变，但没有一次有效...
是否缺少其他配置？
可能是name_server不正确？
我试过了

server_name testing.api.example.com;
server_name 3.89.65.77;
#server_name 3.89.65.77; (commented)
server_name wach.quest;