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import { NextRequest, NextResponse } from 'next/server'; const BACKEND_URL = process.env.BACKEND_URL || process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8080';const API_KEY = process.env.API_KEY || ''; export async function GET(  request: NextRequest,  { params }: { params: Promise<{ path: string[] }> }) {  const { path } = await params;  return handleRequest(request, 'GET', path);} export async function POST(  request: NextRequest,  { params }: { params: Promise<{ path: string[] }> }) {  const { path } = await params;  return handleRequest(request, 'POST', path);} export async function PUT(  request: NextRequest,  { params }: { params: Promise<{ path: string[] }> }) {  const { path } = await params;  return handleRequest(request, 'PUT', path);} export async function DELETE(  request: NextRequest,  { params }: { params: Promise<{ path: string[] }> }) {  const { path } = await params;  return handleRequest(request, 'DELETE', path);} async function handleRequest(request: NextRequest, method: string, path: string[]) {  try {    const url = new URL(request.url);    const searchParams = url.searchParams.toString();    const targetUrl = `${BACKEND_URL}/${path.join('/')}${searchParams ? `?${searchParams}` : ''}`;     console.log(`Proxying ${method} request to:`, targetUrl);     const headers: HeadersInit = {      ...(request.headers.get('accept') ? { Accept: request.headers.get('accept') as string } : {}),    };     const incomingContentType = request.headers.get('content-type');    if (incomingContentType) headers['Content-Type'] = incomingContentType;     // Prefer per-user Authorization header passed from the browser; fallback to server env API_KEY for local/dev.    const incomingAuth = request.headers.get('authorization');    if (incomingAuth) {      headers['Authorization'] = incomingAuth;    } else if (API_KEY) {      headers['Authorization'] = `Bearer ${API_KEY}`;    }     const body = method !== 'GET' && method !== 'DELETE'       ? await request.text()       : undefined;     const response = await fetch(targetUrl, {      method,      headers,      body,    });     const contentType = response.headers.get('content-type') || 'application/json';     if (contentType.includes('text/event-stream') && response.body) {      return new NextResponse(response.body, {        status: response.status,        headers: {          'Content-Type': contentType,          'Cache-Control': response.headers.get('cache-control') || 'no-cache',        },      });    }     const data = await response.text();    return new NextResponse(data, {      status: response.status,      headers: { 'Content-Type': contentType },    });   } catch (error) {    console.error('Proxy error:', error);    return NextResponse.json(      { error: 'Internal server error', details: String(error) },      { status: 500 }    );  }}