🐛 Issue with middleware redirect in docker

src/middleware.ts

@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server';
 import { env } from 'process';
 
+import { getUrl } from './tools/server/url';
 import { client } from './utils/api';
 
 const skippedUrls = [
@@ -41,7 +42,5 @@ export async function middleware(req: NextRequest) {
     return NextResponse.next();
   }
 
-  url.pathname = '/onboard';
-
-  return NextResponse.redirect(url);
+  return NextResponse.redirect(getUrl(req) + '/onboard');
 }

src/pages/404.tsx

@@ -1,9 +1,9 @@
 import { Button, Center, Stack, Text, Title, createStyles } from '@mantine/core';
 import { GetServerSidePropsContext } from 'next';
+import { useTranslation } from 'next-i18next';
 import Head from 'next/head';
 import Image from 'next/image';
 import Link from 'next/link';
-import { useTranslation } from 'next-i18next';
 import pageNotFoundImage from '~/images/undraw_page_not_found_re_e9o6.svg';
 import { pageNotFoundNamespaces } from '~/tools/server/translation-namespaces';
 
@@ -24,7 +24,7 @@ export default function Custom404() {
         <Title>{t('title')}</Title>
         <Text>{t('text')}</Text>
 
-        <Button component={Link} variant="light" href="/">
+        <Button component={Link} variant="light" href="/b">
           {t('button')}
         </Button>
       </Stack>

src/tools/server/url.ts

@@ -0,0 +1,6 @@
+import { NextRequest } from 'next/server';
+
+export const getUrl = (req: NextRequest) => {
+  const protocol = req.nextUrl.protocol;
+  return protocol + '//' + req.headers.get('host');
+};