fix(ext/websocket): don't throw exception when sending to closed sock…

…et (#26932)

[The WebSocket specification for the `send`
function](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/send)
says:

> The browser will throw an exception if you call `send()` when the
connection is in the `CONNECTING` state. If you call `send()` when the
connection is in the `CLOSING` or `CLOSED` states, the browser will
silently discard the data.

and:

> ### Exceptions
> 
> `InvalidStateError`
[`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException)
> 
> Thrown if
[`WebSocket.readyState`](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/readyState)
is `CONNECTING`.

This pull request fixes the current behavior to match the specification.
Also, I believe it fixes #17586.

ext/websocket/01_websocket.js

@@ -330,10 +330,14 @@ class WebSocket extends EventTarget {
     webidl.requiredArguments(arguments.length, 1, prefix);
     data = webidl.converters.WebSocketSend(data, prefix, "Argument 1");
 
-    if (this[_readyState] !== OPEN) {
+    if (this[_readyState] === CONNECTING) {
       throw new DOMException("'readyState' not OPEN", "InvalidStateError");
     }
 
+    if (this[_readyState] !== OPEN) {
+      return;
+    }
+
     if (this[_sendQueue].length === 0) {
       // Fast path if the send queue is empty, for example when only synchronous
       // data is being sent.

tests/unit/websocket_test.ts

@@ -806,3 +806,18 @@ Deno.test("Close connection", async () => {
   await server.finished;
   conn.close();
 });
+
+Deno.test("send to a closed socket", async () => {
+  const { promise, resolve } = Promise.withResolvers<void>();
+  const ws = new WebSocket("ws://localhost:4242");
+  const blob = new Blob(["foo"]);
+  ws.onerror = () => fail();
+  ws.onopen = () => {
+    ws.close();
+    ws.send(blob);
+  };
+  ws.onclose = () => {
+    resolve();
+  };
+  await promise;
+});

tests/wpt/runner/expectation.json

@@ -11303,10 +11303,10 @@
           "006.html?default": true,
           "006.html?wpt_flags=h2": false,
           "006.html?wss": false,
-          "007.html?default": false,
+          "007.html?default": true,
           "007.html?wpt_flags=h2": false,
           "007.html?wss": false,
-          "008.html?default": false,
+          "008.html?default": true,
           "008.html?wss": false,
           "009.html?default": {
             "ignore": true