diff --git a/api/src/middlewares/TestClient.ts b/api/src/middlewares/TestClient.ts
new file mode 100644
index 00000000..4e3c9de3
--- /dev/null
+++ b/api/src/middlewares/TestClient.ts
@@ -0,0 +1,66 @@
+import bodyParser, { OptionsJson } from "body-parser";
+import express, { NextFunction, Request, Response, Application } from "express";
+import { HTTPError } from "lambert-server";
+import fs from "fs";
+import path from "path";
+import fetch, { Response as FetchResponse } from "node-fetch";
+import { Config } from "@fosscord/server-util";
+
+export default function TestClient(app: Application) {
+ const assetCache = new Map<string, { response: FetchResponse; buffer: Buffer }>();
+ const indexHTML = fs.readFileSync(path.join(__dirname, "..", "..", "client_test", "index.html"), { encoding: "utf8" });
+
+ app.use("/assets", express.static(path.join(__dirname, "..", "assets")));
+
+ app.get("/assets/:file", async (req: Request, res: Response) => {
+ delete req.headers.host;
+ var response: FetchResponse;
+ var buffer: Buffer;
+ const cache = assetCache.get(req.params.file);
+ if (!cache) {
+ response = await fetch(`https://discord.com/assets/${req.params.file}`, {
+ // @ts-ignore
+ headers: {
+ ...req.headers
+ }
+ });
+ buffer = await response.buffer();
+ } else {
+ response = cache.response;
+ buffer = cache.buffer;
+ }
+
+ response.headers.forEach((value, name) => {
+ if (
+ [
+ "content-length",
+ "content-security-policy",
+ "strict-transport-security",
+ "set-cookie",
+ "transfer-encoding",
+ "expect-ct",
+ "access-control-allow-origin",
+ "content-encoding"
+ ].includes(name.toLowerCase())
+ ) {
+ return;
+ }
+ res.set(name, value);
+ });
+ assetCache.set(req.params.file, { buffer, response });
+
+ return res.send(buffer);
+ });
+ app.get("*", (req: Request, res: Response) => {
+ res.set("Cache-Control", "public, max-age=" + 60 * 60 * 24);
+ res.set("content-type", "text/html");
+ var html = indexHTML;
+ const CDN_ENDPOINT = (Config.get()?.cdn.endpoint || process.env.CDN || "").replace(/(https?)?(:\/\/?)/g, "");
+ const GATEWAY_ENDPOINT = Config.get()?.gateway.endpoint || process.env.GATEWAY || "";
+
+ if (CDN_ENDPOINT) html = html.replace(/CDN_HOST: .+/, `CDN_HOST: "${CDN_ENDPOINT}",`);
+ if (GATEWAY_ENDPOINT) html = html.replace(/GATEWAY_ENDPOINT: .+/, `GATEWAY_ENDPOINT: "${GATEWAY_ENDPOINT}",`);
+
+ res.send(html);
+ });
+}
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