Allow statusCode and statusMessage to be changed on IncomingMessage

src/js/node/http.ts

@@ -653,6 +653,8 @@ var isNextIncomingMessageHTTPS = false;
 
 var typeSymbol = Symbol("type");
 var reqSymbol = Symbol("req");
+var statusSymbol = Symbol("status");
+var statusMessageSymbol = Symbol("statusMessage");
 var bodyStreamSymbol = Symbol("bodyStream");
 var noBodySymbol = Symbol("noBody");
 var abortedSymbol = Symbol("aborted");
@@ -771,13 +773,19 @@ Object.defineProperty(IncomingMessage.prototype, "connection", {
 
 Object.defineProperty(IncomingMessage.prototype, "statusCode", {
   get() {
-    return this[reqSymbol].status;
+    return this[statusSymbol] ?? this[reqSymbol].status;
+  },
+  set(value) {
+    this[statusSymbol] = value;
   },
 });
 
 Object.defineProperty(IncomingMessage.prototype, "statusMessage", {
   get() {
-    return STATUS_CODES[this[reqSymbol].status];
+    return this[statusMessageSymbol] ?? STATUS_CODES[this[reqSymbol].status];
+  },
+  set(value) {
+    this[statusMessageSymbol] = value;
   },
 });
 

test/regression/issue/08258.test.ts

@@ -0,0 +1,31 @@
+import { test, expect, mock, afterAll } from "bun:test";
+import type { AddressInfo } from "node:net";
+import type { Server } from "node:http";
+import { createServer } from "node:http";
+import { reject } from "lodash";
+
+let server: Server;
+
+test("can set statusCode and statusMessage on IncomingMessage", async () => {
+  const fn = mock((req, res) => {
+    req.statusCode = 404;
+    expect(req.statusCode).toBe(404);
+    req.statusMessage = "Who dis?";
+    expect(req.statusMessage).toBe("Who dis?");
+    res.end();
+  });
+  server = createServer(fn).listen(0);
+  const url = await new Promise<string>(resolve => {
+    server.on("listening", async () => {
+      const { address, port, family } = server.address() as AddressInfo;
+      resolve(`http://${family === "IPv6" ? `[${address}]` : address}:${port}/`);
+    });
+    server.on("error", reject);
+  });
+  expect(fetch(url)).resolves.toBeInstanceOf(Response);
+  expect(fn).toHaveBeenCalledTimes(1);
+});
+
+afterAll(() => {
+  server?.close();
+});