im trying to fetch data trough internal connection from my next app to nginx container
the public connections works ok but internal connection from next to nginx getting refused
TypeError: fetch failed

Sep 17 12:30:06

at Object.fetch (node:internal/deps/undici/undici:11730:11)

Sep 17 12:30:06

at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

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at async l (/app/.next/server/chunks/791.js:1:15607)

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at async c (/app/.next/server/app/user/store/addproduct/page.js:1:12933) {

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cause: Error: connect ECONNREFUSED fd12:d5b3:325::71:9b4a:a356:80

Sep 17 12:30:06

at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1595:16)

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at TCPConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17) {

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errno: -111,

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code: 'ECONNREFUSED',

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syscall: 'connect',

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address: 'fd12:d5b3:325::71:9b4a:a356',

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port: 80

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},

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digest: '1502078682'

Sep 17 12:30:06

}
dc995e0b-6c2b-4228-add9-fd64346b4281
the url that i tried already with are :
http://nginx.railway.internal:80
http://nginx.railway.internal
nginx.railway.internal
nginx.railway.internal:80