arams"><tr><th style="width:25%;"><code>request</code></th><td><p>A URLRequest object specifying the URL to download.</p></td></tr></table><p class="javadoc">Throws:</p><table class="table table-bordered params"><tr class="indent"><th style="width:25%;"><code>ArgumentError</code></th><td><p><code><a href="../../openfl/net/URLRequest.html#requestHeader">URLRequest.requestHeader</a></code> objects may
not contain certain prohibited HTTP request headers.
For more information, see the URLRequestHeader class
des