feat: new file

frontend/app/api/[...path]/route.ts

@@ -0,0 +1,62 @@
+import { NextRequest } from "next/server";
+
+const BACKEND_URL = process.env.BACKEND_URL || "http://localhost:8000";
+
+export async function GET(req: NextRequest, ctx: { params: Promise<{ path: string[] }> }) {
+  const { path } = await ctx.params;
+  const url = new URL(req.url);
+  const upstream = `${BACKEND_URL}/api/${path.join("/")}${url.search}`;
+  return await safeUpstreamFetch(() => fetch(upstream, { headers: forwardHeaders(req) }));
+}
+
+export async function POST(req: NextRequest, ctx: { params: Promise<{ path: string[] }> }) {
+  const { path } = await ctx.params;
+  const url = new URL(req.url);
+  const upstream = `${BACKEND_URL}/api/${path.join("/")}${url.search}`;
+  const body = await req.text();
+  return await safeUpstreamFetch(() =>
+    fetch(upstream, {
+      method: "POST",
+      headers: { ...forwardHeaders(req), "content-type": req.headers.get("content-type") || "application/json" },
+      body
+    })
+  );
+}
+
+function forwardHeaders(req: NextRequest) {
+  const h = new Headers();
+  const auth = req.headers.get("authorization");
+  if (auth) h.set("authorization", auth);
+  return h;
+}
+
+async function forwardResponse(r: Response) {
+  const headers = new Headers(r.headers);
+  headers.delete("access-control-allow-origin");
+  return new Response(await r.arrayBuffer(), { status: r.status, headers });
+}
+
+async function safeUpstreamFetch(doFetch: () => Promise<Response>) {
+  const maxAttempts = 3;
+  for (let i = 0; i < maxAttempts; i++) {
+    try {
+      const r = await doFetch();
+      return await forwardResponse(r);
+    } catch (e: any) {
+      const code = e?.cause?.code || e?.code;
+      const retryable = code === "ECONNREFUSED" || code === "ENOTFOUND" || code === "EAI_AGAIN";
+      if (!retryable || i === maxAttempts - 1) {
+        return new Response(
+          JSON.stringify({
+            detail: "上游后端不可达（backend 容器可能正在重启或未就绪）。",
+            error: String(code || e?.message || e)
+          }),
+          { status: 503, headers: { "content-type": "application/json; charset=utf-8" } }
+        );
+      }
+      await new Promise((r) => setTimeout(r, 200 * (i + 1)));
+    }
+  }
+  return new Response(JSON.stringify({ detail: "unknown" }), { status: 503 });
+}
+