<!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("InvalidStateError", function() { client.setRequestHeader("x-test", "test") }) if(client.readyState == 4) test.done() }) } client.send(null) }) </script> </body> </html>