require("reflect-metadata");
const { NestFactory } = require("@nestjs/core");
const { Controller, Module, Body, Post, Req } = require("@nestjs/common");

class C {
  @Post("/hook")
  hook(@Req() req, @Body() b) {
    return {
      rawBodyIsBuffer: Buffer.isBuffer(req.rawBody),
      rawBodyLen: req.rawBody ? req.rawBody.length : null,
      bodyKeys: b ? Object.keys(b) : null,
      bodyBlobLen: b && b.blob ? b.blob.length : null
    };
  }
}
@Module({ controllers: [C] })
class M {}

(async () => {
  const app = await NestFactory.create(M, { logger: false, rawBody: true });
  const server = await app.listen(0);
  const port = server.address().port;
  const small = JSON.stringify({ hello: "world", n: 123 });
  const r1 = await fetch(`http://127.0.0.1:${port}/hook`, { method: "POST", headers: { "content-type": "application/json" }, body: small });
  console.log("small ->", r1.status, await r1.text());
  const big = JSON.stringify({ blob: "x".repeat(150 * 1024) });
  const r2 = await fetch(`http://127.0.0.1:${port}/hook`, { method: "POST", headers: { "content-type": "application/json" }, body: big });
  console.log("150kb ->", r2.status, (await r2.text()).slice(0, 140));
  await app.close();
})();