[Bug] nginx反代失败502 Bad Gateway

[WinterBokeh]

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描述问题

本意是想实现二级域名访问本服务的功能, chat.xxx.xxx。
使用nginx对本项目进行反代，访问遇到502，查看nginx日志，报错如下：

[error] 76#76: *969 no live upstreams while connecting to upstream, client: xxx, server: xx.xx.xx, request: "GET / HTTP/1.1", upstream: "http://localhost/", host: "xx.xx.xx"
[error] 76#76: *972 connect() failed (111: Connection refused) while connecting to upstream, client: xxx, server: xx.xx.xx, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:3000/", host: "xx.xx.xx"

服务本身没问题，防火墙开放3000端口，绕过nginx，直接域名:3000可以正常访问。
nginx本身也没问题，一起反代的其他项目在正常使用。

如何复现

docker部署nginx和本项目，并开放了相关端口。
部署指令：

docker run -d --name chat -p 3000:3000 \
   -e OPENAI_API_KEY="sk-xxx" \
   -e CODE="xxx" \
   --net=host \
   -e PROXY_URL="http://127.0.0.1:7890" \
   yidadaa/chatgpt-next-web

经测试，即使去掉--net=host \仍然出现同样问题。

nginx配置文件：

#chat.conf
server {
    listen 80;
    server_name chat.xxx.xxx;

    location / {
        proxy_pass http://localhost:3000/;
        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_cache off;
        proxy_buffering off;
        chunked_transfer_encoding on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 300;
      }
}

#nginx.conf
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;

    client_max_body_size 50M;
    client_body_buffer_size 50M;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

一些必要的信息

• 系统：[linux]
• 浏览器： [chrome, safari]
• 版本： [435e82c]
• 部署方式：[docker服务器部署]
• nginx/1.23.4

[yinm0591]

docker run 加上--network="host" 参数
nginx的proxy_pass地址改成 http://[::1]:3000/;

试试是否解决问题

[Yidadaa]

#1569

[WinterBokeh]

已解决。
参考#1569
把proxy_pass的localhost改成宿主机的局域网ip即可。

[lin-1259]

已解决。 参考#1569 把proxy_by的localhost改成宿主机的局域网ip即可。

老哥,proxy_by这个在哪修改,遇到同样的问题了

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

resolved. Refer to #1569 to change the localhost of proxy_by to the local area network ip of the host machine.

Brother, where to modify proxy_by, I have encountered the same problem

[WinterBokeh]

Bot detected the issue body's language is not English, translate it automatically.

resolved. Refer to #1569 to change the localhost of proxy_by to the local area network ip of the host machine.

Brother, where to modify proxy_by, I have encountered the same problem

Bot detected the issue body's language is not English, translate it automatically.

resolved. Refer to #1569 to change the localhost of proxy_by to the local area network ip of the host machine.

Brother, where to modify proxy_by, I have encountered the same problem

In nginx config file. My pen mistake is proxy_pass instead of proxy_by, and now my original reply has been corrected.
Here is my config file for your reference：

server {
    listen 80;
    server_name chat.xxx.xxx;

    access_log /root/chat_access.log;
    error_log /root/chat_error.log;

    location / {
        proxy_pass http://172.17.0.15:3000/;
        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_cache off;
        proxy_buffering off;
        chunked_transfer_encoding on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 300;
      }
}

172.17.0.15 is my IPv4 address for eth0.

[lin-1259]

机器人检测到问题正文的语言不是英语，自动翻译它。

解决了参考#1569将proxy_by的localhost修改为主机的局域网ip。

兄弟，在哪里修改proxy_by，我也遇到过同样的问题

机器人检测到问题正文的语言不是英语，自动翻译它。

解决了参考#1569将proxy_by的localhost修改为主机的局域网ip。

兄弟，在哪里修改proxy_by，我也遇到过同样的问题

在nginx配置文件中。我的笔误是proxy_pass而不是proxy_by，现在我原来的回复已经被纠正了。 下面是我的配置文件供您参考：

服务器{
    listen 80;
    服务器名称chat.xxx.xxx;

    access_log/root/chat_access.log;
    error_log/root/chat_error.log;

    位置/ {
        代理_通行证http：//172.17.0.15：3000/;
        proxy_set_header主机$host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_cache off;
        proxy_buffering off;
        chunked_transfer_encoding on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 300
      }
}

172.17.0.15是eth0的IPv4地址。

谢谢老哥，解决问题啦