nodejs
diff --git a/Collapse file
‎lib/_http_server.js‎
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+1-1Lines changed: 1 addition & 1 deletion b/Collapse file
‎lib/_http_server.js‎
Copy file name to clipboardExpand all lines: lib/_http_server.js
+1-1Lines changed: 1 addition & 1 deletion
diff --git a/Collapse file
‎test/parallel/test-http-write-head-2.js‎
Copy file name to clipboardExpand all lines: test/parallel/test-http-write-head-2.js
+18Lines changed: 18 additions & 0 deletions b/Collapse file
‎test/parallel/test-http-write-head-2.js‎
Copy file name to clipboardExpand all lines: test/parallel/test-http-write-head-2.js
+18Lines changed: 18 additions & 0 deletions
@@ -347,7 +347,7 @@ function writeHead(statusCode, reason, obj) {
     // writeHead(statusCode[, headers])
     if (!this.statusMessage)
       this.statusMessage = STATUS_CODES[statusCode] || 'unknown';
-    obj = reason;
+    obj ??= reason;
   }
   this.statusCode = statusCode;
 
 
@@ -59,3 +59,21 @@ const http = require('http');
     }));
   }));
 }
+
+{
+  const server = http.createServer(common.mustCall((req, res) => {
+    res.writeHead(200, undefined, [ 'foo', 'bar' ]);
+    res.end();
+  }));
+
+  server.listen(0, common.mustCall(() => {
+    http.get({ port: server.address().port }, common.mustCall((res) => {
+      assert.strictEqual(res.statusMessage, 'OK');
+      assert.strictEqual(res.statusCode, 200);
+      assert.strictEqual(res.headers.foo, 'bar');
+      res.resume().on('end', common.mustCall(() => {
+        server.close();
+      }));
+    }));
+  }));
+}
Original file line number	Diff line number	Diff line change
`@@ -347,7 +347,7 @@ function writeHead(statusCode, reason, obj) {`
`347`	`347`	`// writeHead(statusCode[, headers])`
`348`	`348`	`if (!this.statusMessage)`
`349`	`349`	`this.statusMessage = STATUS_CODES[statusCode] \|\| 'unknown';`
`350`		`- obj = reason;`
	`350`	`+ obj ??= reason;`
`351`	`351`	`}`
`352`	`352`	`this.statusCode = statusCode;`
`353`	`353`