Fix memory leak in response.clone(), further reduce memory usage of Request & Response (#3902)

* Atomize respsone.url & response.statusText

* Fix warning

* Atomize Request & Response URLs when possible

* Fix memory leak in response.clone()

bun/bench/snippets on  jarred/atomize
❯ mem bun --smol request-response-clone.mjs
cpu: Apple M1 Max
runtime: bun 0.7.2 (arm64-darwin)

benchmark             time (avg)             (min … max)       p75       p99      p995
-------------------------------------------------------- -----------------------------
req.clone().url     77.3 ns/iter  (40.35 ns … 222.64 ns)  91.53 ns 128.11 ns 172.78 ns
resp.clone().url  162.43 ns/iter    (116 ns … 337.77 ns)  177.4 ns 232.38 ns 262.65 ns

Peak memory usage: 60 MB

bun/bench/snippets on  jarred/atomize
❯ mem bun-0.7.1 --smol request-response-clone.mjs
cpu: Apple M1 Max
runtime: bun 0.7.1 (arm64-darwin)

benchmark             time (avg)             (min … max)       p75       p99      p995
-------------------------------------------------------- -----------------------------
req.clone().url   115.85 ns/iter  (80.35 ns … 247.39 ns) 128.19 ns 181.93 ns 207.23 ns
resp.clone().url  252.32 ns/iter  (202.6 ns … 351.07 ns) 266.56 ns 325.88 ns 334.73 ns

Peak memory usage: 1179 MB

* Update tests

* Update js_ast.zig

* Update test

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 37 insertions, 3 deletions

diff --git a/test/js/web/fetch/fetch.test.ts b/test/js/web/fetch/fetch.test.ts
index d7fc87ade..ec73069de 100644
--- a/test/js/web/fetch/fetch.test.ts
+++ b/test/js/web/fetch/fetch.test.ts
@@ -30,6 +30,14 @@ afterAll(() => {
 const payload = new Uint8Array(1024 * 1024 * 2);
 crypto.getRandomValues(payload);
 
+it("new Request(invalid url) throws", () => {
+  expect(() => new Request("http")).toThrow();
+  expect(() => new Request("")).toThrow();
+  expect(() => new Request("http://[::1")).toThrow();
+  expect(() => new Request("https://[::1")).toThrow();
+  expect(() => new Request("!")).toThrow();
+});
+
 describe("AbortSignal", () => {
   beforeEach(() => {
     startServer({
@@ -1165,9 +1173,9 @@ it("should not be able to parse json from empty body", () => {
 });
 
 it("#874", () => {
-  expect(new Request(new Request("https://example.com"), {}).url).toBe("https://example.com");
-  expect(new Request(new Request("https://example.com")).url).toBe("https://example.com");
-  expect(new Request({ url: "https://example.com" }).url).toBe("https://example.com");
+  expect(new Request(new Request("https://example.com"), {}).url).toBe("https://example.com/");
+  expect(new Request(new Request("https://example.com")).url).toBe("https://example.com/");
+  expect(new Request({ url: "https://example.com" }).url).toBe("https://example.com/");
 });
 
 it("#2794", () => {
@@ -1213,3 +1221,29 @@ it("fetch() file:// works", async () => {
     await Bun.file(Bun.fileURLToPath(new URL("file with space in the name.txt", import.meta.url))).text(),
   );
 });
+
+it("cloned response headers are independent before accessing", () => {
+  const response = new Response("hello", {
+    headers: {
+      "content-type": "text/html; charset=utf-8",
+    },
+  });
+  const cloned = response.clone();
+  cloned.headers.set("content-type", "text/plain");
+  expect(response.headers.get("content-type")).toBe("text/html; charset=utf-8");
+});
+
+it("cloned response headers are independent after accessing", () => {
+  const response = new Response("hello", {
+    headers: {
+      "content-type": "text/html; charset=utf-8",
+    },
+  });
+
+  // create the headers
+  response.headers;
+
+  const cloned = response.clone();
+  cloned.headers.set("content-type", "text/plain");
+  expect(response.headers.get("content-type")).toBe("text/html; charset=utf-8");
+});