fetch api are broken

[codehz]

What happened

two problem:

1. http module cannot actually response POST request
2. fetch cannot send POST body properly

What you expected

it should work like other runtime

Minimal reproduction

import { createServer } from "node:http";

const httpServer = createServer((req, res) => {
  console.log("receive request");
  if (req.method === "POST" && req.url === "/echo") {
    let chunks: string[] = [];
    req.on("data", (chunk: Buffer) => {
      console.log("receive data", chunk)
      chunks.push(chunk.toString());
    });
    req.on("end", () => {
      const body = chunks.join("");
      console.log("receive data end", chunks)
      res.statusCode = 200;
      res.setHeader("Content-Type", "text/plain");
      res.end("got:" + body);
    });
    return;
  }
  res.statusCode = 200;
  res.setHeader("Content-Type", "application/json");
  res.end(`{"path":"${req.url}"}`);
});

httpServer.listen(3000, async () => {
  console.log("[node:http] listening on http://0.0.0.0:3000");
  console.log("send request");
  const response = await fetch("http://localhost:3000/echo", {
    method: "POST",
    body: Buffer.from("0123456789ABCDEF"),
  });
  console.log("receive response");
  console.log("ECHO", await response.text());
});

Command you ran:

perry run

Output:

[node:http] listening on http://0.0.0.0:3000
send request
receive request
receive data <Buffer 43 44 45 46 00 00 00 00 00 00 00 00 00 00 00 00>
receive data end [ 'CDEF' ]

(and no response)

in bun/nodejs

[node:http] listening on http://0.0.0.0:3000
send request
receive request
receive data <Buffer 30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46>
receive data end [ "0123456789ABCDEF" ]
receive response
ECHO got:0123456789ABCDEF

Environment

• Perry version: perry 0.5.1207
• Host OS: ArchLinux
• Target: native
• Rust toolchain (if building from source): rustc 1.95.0 (59807616e 2026-04-14)
• Installed via: from source

Diagnostic output

Perry Doctor

Environment Checks
──────────────────
  ✓ perry version: 0.5.1207
  ✓ update status: up to date
  ✓ clang (LLVM codegen): clang version 22.1.6
  ✓ system linker (cc): cc (GCC) 16.1.1 20260625
  ✓ runtime library: /home/codehz/Projects/perry/target/release/libperry_runtime.a
  ✓ project config (perry.toml): found
  ✓ compatibility reports (#849): mode=ask (sent=0, suppressed-by-dedup=0, queued=0, cache=empty)

All checks passed!

Anything else