http: add response.writableFinished

response.writableFinished is true if all data has been flushed to the
underlying system.

PR-URL: https://github.com/nodejs/node/pull/28681
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/test/parallel/test-http-outgoing-writableFinished.js b/test/parallel/test-http-outgoing-writableFinished.js
new file mode 100644
index 0000000000..6f84d91e71
--- /dev/null
+++ b/test/parallel/test-http-outgoing-writableFinished.js
@@ -0,0 +1,32 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const http = require('http');
+
+const server = http.createServer(common.mustCall(function(req, res) {
+  assert.strictEqual(res.writableFinished, false);
+  res
+    .on('finish', common.mustCall(() => {
+      assert.strictEqual(res.writableFinished, true);
+      server.close();
+    }))
+    .end();
+}));
+
+server.listen(0);
+
+server.on('listening', common.mustCall(function() {
+  const clientRequest = http.request({
+    port: server.address().port,
+    method: 'GET',
+    path: '/'
+  });
+
+  assert.strictEqual(clientRequest.writableFinished, false);
+  clientRequest
+    .on('finish', common.mustCall(() => {
+      assert.strictEqual(clientRequest.writableFinished, true);
+    }))
+    .end();
+  assert.strictEqual(clientRequest.writableFinished, false);
+}));