XMLHttpRequest: fix a bug where 'Access-Control-Allow-Origin: *' was not handled correctly

Author: duonglaiquang

src/main/java/org/htmlunit/javascript/host/xml/XMLHttpRequest.java

@@ -1133,6 +1133,10 @@ private boolean isPreflightAuthorized(final WebResponse preflightResponse) {
             if (HttpHeader.ACCESS_CONTROL_ALLOW_HEADERS.equalsIgnoreCase(pair.getName())) {
                 String value = pair.getValue();
                 if (value != null) {
+                    if ("*".equals(value)) {
+                        // all headers are allowed
+                        return true;
+                    }
                     value = org.htmlunit.util.StringUtils.toRootLowerCase(value);
                     final String[] values = org.htmlunit.util.StringUtils.splitAtComma(value);
                     for (String part : values) {