feat(F-097): completed feature

project/apps/admin/src/app/api/[...path]/route.ts

@@ -30,10 +30,12 @@ export async function POST(req: NextRequest) {
   const cookies = req.headers.get('cookie') ?? '';
   const body = await req.text();
   try {
+    const headers: Record<string, string> = { Cookie: cookies };
+    if (body) headers['Content-Type'] = 'application/json';
     const backendRes = await fetch(`${API}/${path}`, {
       method: 'POST',
-      headers: { 'Content-Type': 'application/json', Cookie: cookies },
-      body,
+      headers,
+      ...(body ? { body } : {}),
     });
     const setCookie = backendRes.headers.get('set-cookie');
     const data = await backendRes.json().catch(() => null);