1 files changed, 27 insertions, 0 deletions
diff --git a/testing/web-platform/tests/xhr/setrequestheader-after-send.htm b/testing/web-platform/tests/xhr/setrequestheader-after-send.htm
new file mode 100644
index 0000000000..174e9ec419
--- /dev/null
+++ b/testing/web-platform/tests/xhr/setrequestheader-after-send.htm
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() after send()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="/following::ol/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/delay.py?ms=0")
+        client.onreadystatechange = function() {
+          test.step(function() {
+            assert_throws_dom("InvalidStateError", function() { client.setRequestHeader("x-test", "test") })
+            if(client.readyState == 4)
+              test.done()
+          })
+        }
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>