Nginx反向代理Next.js应用时NextAuth重定向至localhost问题

算力阿峰

2026-8-14

问题

本地开发的Next.js应用部署到配置了Nginx反向代理的开发环境（仍以开发模式启动），启动时控制台出现NextAuth的[NEXTAUTH_URL]警告。已完成以下配置：

设置环境变量NEXTAUTH_URL为域名https://subdomain.example.com
在[...nextauth].js中配置site: process.env.NEXTAUTH_URL

但使用NextAuth邮箱登录时，会重定向至http://localhost:port并返回Access Denied，无法定位问题出在Next.js还是Nginx。附Nginx的sites-available配置：

server {
    listen 80;
    server_name *.example.com;
    return 301 https://$host$request_uri;
}

server {
    listen              443 ssl;

    ssl_certificate     /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         HIGH:!aNULL:!MD5;

#    root /usr/share/example.com/html; #solo per file statici
#    index index.html; #solo per file statici

    server_name *.example.com;

    location / {
#            try_files $uri $uri/ =404; #solo per file statici
#                proxy_set_header Host $host;
#                proxy_set_header X-Real-IP $remote_addr;
                proxy_pass http://127.0.0.1:8000;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
                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;
                proxy_set_header X-Forwarded-Host $host;
                proxy_set_header X-Forwarded-Port $server_port;

   }
}