当我使用 AWS ec2 的 Nginx 时，站点已被 Cors 策略阻止

问：

我正在尝试在 AWS ec2 服务器上运行 react 项目。 所以我部署了节点服务器并在 Ec2 实例中构建了 react 项目。 我正在尝试在节点服务器和构建的 react 项目之间进行连接。 我正在使用 Nginx 服务器。 这是 nginx.conf 文件内容。

`# 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 {
        }
    }

server {
server_name proqureng.com;
root /var/www/client;
index index.html;

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/proqureng.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/proqureng.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}
server {
listen 80;
listen \[::\]:80;
server_name proqureng.com;

       location / {
       add_header Access-Control-Allow-Origin *;
           proxy_pass https://localhost:5005;
           proxy_http_version 1.1;
           proxy_set_header Upgrade $http_upgrade;
           proxy_set_header Connection 'upgrade';
           proxy_set_header Host $host;
           proxy_cache_bypass $http_upgrade;
       }

}
server {
listen 80;
listen \[::\]:80;
server_name python.proqureng.com;

       location / {
       add_header Access-Control-Allow-Origin *;
           proxy_pass https://3.11.83.44:5003;
           proxy_http_version 1.1;
           proxy_set_header Upgrade $http_upgrade;
           proxy_set_header Connection 'upgrade';
           proxy_set_header Host $host;
           proxy_cache_bypass $http_upgrade;
       }

}
server {
listen 80;
server_name admin.proqureng.com;
root /var/www/admin;
index index.html;
}

    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 {
        }
    }
    server {
       listen 5001;
       server_name 3.11.83.44;
       root /var/www/admin;
       index index.html;
    }
    server {
       listen 5002;
       server_name 3.11.83.44;
       root /var/www/client;
       index index.html;
    }
    server {
    listen 80;
    server_name www.proqureng.com;
    return 301 $scheme://proqureng.com$request_uri;

}

# 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 {

# }

# }

}\`

我遇到了这样的错误。在此处输入图像描述

我希望有人能解决这个错误。 谢谢

我想在 AWS Ec2 上运行前端和后端。 我想解决这个问题。