During execution simple webpage with sort of ad frame (https://www.w3schools.com/js/tryit.asp?filename=tryjs_timing1) runtime crashes with the following stacktrace:
```
Received 'https://script.4dex.io/localstore.js'.
ASSERTION FAILED: headerValue.is8Bit()
modules/javafx.web/src/main/native/Source/WebCore/loader/ServerTimingParser.cpp(44) : Vector<WebCore::ServerTiming> WebCore::ServerTimingParser::parseServerTiming(const WTF::String &)
1 0x329bb9a40 WebCore::ServerTimingParser::parseServerTiming(WTF::String const&)
2 0x329bb9740 WebCore::ResourceTiming::ResourceTiming(WTF::URL const&, WTF::String const&, WebCore::ResourceLoadTiming const&, WebCore::NetworkLoadMetrics const&, WebCore::ResourceResponse const&, WebCore::SecurityOrigin const&)
3 0x329bb95a8 WebCore::ResourceTiming::ResourceTiming(WTF::URL const&, WTF::String const&, WebCore::ResourceLoadTiming const&, WebCore::NetworkLoadMetrics const&, WebCore::ResourceResponse const&, WebCore::SecurityOrigin const&)
4 0x329bb962c WebCore::ResourceTiming::fromLoad(WebCore::CachedResource&, WTF::URL const&, WTF::String const&, WebCore::ResourceLoadTiming const&, WebCore::NetworkLoadMetrics const&, WebCore::SecurityOrigin const&)
5 0x329bd1864 WebCore::SubresourceLoader::reportResourceTiming(WebCore::NetworkLoadMetrics const&)
6 0x329bce90c WebCore::SubresourceLoader::didFinishLoading(WebCore::NetworkLoadMetrics const&)
7 0x329bb8d20 WebCore::ResourceLoader::didFinishLoading(WebCore::ResourceHandle*, WebCore::NetworkLoadMetrics const&)
8 0x32a58b2d0 WebCore::URLLoader::AsynchronousTarget::didFinishLoading()
9 0x32a58c3d4 Java_com_sun_webkit_network_URLLoaderBase_twkDidFinishLoading
10 0x11430d2ec 9 ??? 0x000000011430d2ec 0x0 + 4633711340
11 0x114308bec 10 ??? 0x0000000114308bec 0x0 + 4633693164
12 0x114308bec 11 ??? 0x0000000114308bec 0x0 + 4633693164
13 0x10d1f4900 12 ??? 0x000000010d1f4900 0x0 + 4515121408
14 0x102f17afc JavaCalls::call_helper(JavaValue*, methodHandle const&, JavaCallArguments*, JavaThread*)
15 0x102ff7140 jni_invoke_nonstatic(JNIEnv_*, JavaValue*, _jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, JavaThread*)
16 0x102fffaac jni_CallVoidMethod
17 0x12a0733e4 -[GlassRunnable run]
18 0x189f20f74 __NSThreadPerformPerform
19 0x188935cd4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
20 0x188935c68 __CFRunLoopDoSource0
21 0x1889359d4 __CFRunLoopDoSources0
22 0x188934628 __CFRunLoopRun
23 0x188933c58 CFRunLoopRunSpecific
24 0x1943c827c RunCurrentEventLoopInMode
25 0x1943cb4e8 ReceiveNextEventCommon
26 0x194556484 _BlockUntilNextEventMatchingListInModeWithFilter
27 0x18c85bab4 _DPSNextEvent
28 0x18d1fa5b0 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
29 0x18c84ec64 -[NSApplication run]
30 0x12a076708 -[GlassApplication runLoop:]
31 0x189f20f74 __NSThreadPerformPerform
```