Redirects in docker container always go to 0.0.0.0

[Will-Kerwin]

Summary

I am trying to configure redirects in my next js app (v14). This works fine on my local machine but when I deploy to an azure web app (docker) it always redirects to '0.0.0.0'. How do I get my standalone deployment to use the hostname of the azure web app in its redirects

Additional information

Middleware

import {auth} from "@/lib/auth"
import {getIronSession} from "iron-session";
import {SessionData, sessionOptions} from "@/lib/iron.config";
import {cookies} from "next/headers";
import {AuthError} from "@/types/auth";

export default auth(async (req) => {
    const extUserSession = await getIronSession<SessionData>(
        cookies(),
        sessionOptions,
    );
    if (!req.auth && !extUserSession.isLoggedIn && req.nextUrl.pathname !== "/signin") {
        return Response.redirect(new URL("/signin", req.nextUrl.origin), 302)
    } else if (req.auth && req.nextUrl.pathname === "/signin") {
        return Response.redirect(new URL("/", req.nextUrl.origin), 302)
    } else if (extUserSession.isLoggedIn && req.nextUrl.pathname === "/signin") {
        return Response.redirect(new URL("/user", req.nextUrl.origin), 302)
    }

    if (!req.nextUrl.pathname.match(/(?!admin).*/) && extUserSession.isLoggedIn) {
        return Response.redirect(new URL(`/auth/error?error=${AuthError.AccessDenied}`, req.nextUrl.origin),302)
    }
})

// apply auth middleware to all except auth routes / static / images and favicon
export const config = {
    matcher: ["/((?!api/auth|_next/static|_next/image|favicon.ico|user/login|user/session|verify|auth/error).*)"],
}

Dockerfile

FROM node:18-alpine AS base

# 1. Install dependencies only when needed
FROM base AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat

WORKDIR /app

COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./

RUN \
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
  elif [ -f package-lock.json ]; then npm ci; \
  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
  else echo "Lockfile not found." && exit 1; \
  fi

# 2. Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
# This will do the trick, use the corresponding env file for each environment.
COPY .env .env.production
RUN yarn build

# 3. Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production

RUN addgroup -g 1001 -S nodejs
RUN adduser -S nextjs -u 1001

COPY --from=builder /app/public ./public

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static


USER nextjs

EXPOSE 3000

ENV PORT 3000

CMD HOSTNAME="0.0.0.0" node server.js

### Example

_No response_

[Will-Kerwin]

I have managed to resolve by changing from Response to NextResponse and ensuring any other route handlers just used the redirect() function.

[joaopcm]

This issue is still happening to me :/

[victoxrz]

Hey! can you give some context, maybe i could help you? tried using an absolute url? NextResponse.redirect("http://127.0.0.1:3000/...")

[madfcat]

If you use Docker or some proxy etc, X-Forwarded-Host and X-Forwarded-Port could be really helpful in numerous sequential redirects situation.