FetchError: request to custome admin url failed, reason: getaddrinfo ENOTFOUND

[geekplux]

Bug report

Describe the bug

I tried to deploy by following https://strapi.io/documentation/v3.x/deployment/nginx-proxy.html, no matter what solution I used (Sub-Folder Unified or Sub-Folder Split) I still got error below:

Create your first administrator 💻 by going to the administration panel at:
https://custom_url.com/xadmin
FetchError: request to https://custom_url.com/xadmin failed, reason: getaddrinfo ENOTFOUND custom_url.com
at ClientRequest. (/home/userxxx/project-backend/node_modules/node-fetch/lib/index.js:1455:11)
at ClientRequest.emit (events.js:314:20)
at TLSSocket.socketErrorListener (_http_client.js:428:9)
at TLSSocket.emit (events.js:314:20)
at emitErrorNT (internal/streams/destroy.js:92:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
at processTicksAndRejections (internal/process/task_queues.js:84:21) {
type: 'system',
errno: 'ENOTFOUND',
code: 'ENOTFOUND'
}

the nginx.conf and config/server.js are same as the example which you provided. After a digging through the doc I didn't find anything other options I can attempt to fix this error. Much appreciated if you can figure out or give some tips.

Steps to reproduce the behavior

1. Quick start according to docs
2. change url or admin url in config/server.js
3. config the nginx proxy
4. run and get error

Expected behavior

No error if there is custom url.
(it's actually no error now if I drop all the url changing)

Screenshots

If applicable, add screenshots to help explain your problem.

Code snippets

config/server.js

module.exports = ({ env }) => ({
  host: env('HOST', '0.0.0.0'),
  port: env.int('PORT', 1337),
  // url: 'https://customurl.com/api',
  admin: {
    // url: 'https://customurl.com/xadmin',
    auth: {
      secret: env('ADMIN_JWT_SECRET', '1e978b20a8532605b42d18bf01ea37f4'),
    },
  },
});

System

• Node.js version: 12.19.0
• NPM version: 6.14.8
• Strapi version: 3.1.4
• Database: mysql 8.0.22
• Operating system: debian 10

Additional context

Add any other context about the problem here.

[geekplux]

could I skip the permission checking session? directly get into admin page without login

[lauriejim]

This issue has been mentioned on Strapi Community. There might be relevant details there:

https://forum.strapi.io/t/admin-login-fails-with-401/754/2

[derrickmehaffy]

Ummm nginx.conf the configs we show on our drive are not modifications or replacements of this file, they are virtual host config files.

See: https://www.keycdn.com/support/nginx-virtual-host as an example.

[derrickmehaffy]

Can't reproduce on v3.4.4 with the exception of the issue detailed here: #8616

Marking as closed until we get further information