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next.config.ts

@@ -1,6 +1,7 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
+  basePath: process.env.BASE_PATH,
 	reactStrictMode: true,
 	output: "standalone",
 	images: {

src/app/api/auth/[...nextauth]/route.ts

@@ -1,2 +1,31 @@
-import { handlers } from "@/auth";
-export const { GET, POST } = handlers;
+// import { handlers } from "@/auth";
+// export const { GET, POST } = handlers;
+//
+import { NextRequest } from 'next/server'
+
+import { handlers } from '@/auth'
+
+const basePath = process.env.BASE_PATH ?? ''
+
+function rewriteRequest(request) {
+    let { protocol, host, pathname } = request.nextUrl;
+
+    const headers = request.headers
+    // Host rewrite adopted from next-auth/packages/core/src/lib/utils/env.ts:createActionURL
+    const detectedHost = headers.get("x-forwarded-host") ?? host
+    const detectedProtocol = headers.get("x-forwarded-proto") ?? protocol
+    const _protocol = detectedProtocol.endsWith(":")
+        ? detectedProtocol
+        : detectedProtocol + ":";
+    const url = new URL(`${_protocol}//${detectedHost}${basePath}${pathname}${request.nextUrl.search}`)
+
+    return new NextRequest(url, request)
+}
+
+export async function GET(request, props) {
+    return await handlers.GET(rewriteRequest(request))
+}
+
+export async function POST(request, props) {
+    return await handlers.POST(rewriteRequest(request))
+}

src/auth.ts

@@ -32,7 +32,10 @@ export const providerMap = providers.map((provider) => {
 	}
 });
 
+const basePath = process.env.BASE_PATH ?? ''
+
 const config = {
+  basePath: `${basePath}/api/auth`,
 	providers,
 	pages: {
 		signIn: "/signin",