issue with WebView in 8u202

Kevin Rushforth kevin.rushforth at
Mon Nov 19 21:51:02 UTC 2018

I can reproduce it and it seems related to Cross-Site-Scripting (XSS) 
protections, which you have enabled in your HTML header with:

     <meta http-equiv="Content-Security-Policy" ...>

If I remove the 'http-equiv="Content-Security-Policy"' from the 
meta-data then it displays just fine.

Perhaps Arun or Murali could comment on whether this is a bug or not. It 
seems just as likely to me that it is a feature that didn't used to be 
enabled and now is.

-- Kevin

On 11/19/2018 1:44 PM, Anton Tarasov wrote:
> Hi Kevin,
> On 11/20/2018 12:21 AM, Kevin Rushforth wrote:
>> Hi Anton,
>> We'll take a look and see if we can reproduce it. Am I correct in 
>> understanding that the problem only happens with loadContent, which 
>> works on 8u152 and fails on 8u202-ea? And that load from a file works 
>> fine on both 8u152 and 8u202-ea?
> Yes, that's right. I've also checked that it's broken in the latest 
> jfx12 as well. I'd appreciate your help in resolving this.
> Thanks,
> Anton.
>> -- Kevin
>> On 11/19/2018 12:17 PM, Anton Tarasov wrote:
>>> Hello, JFX team!
>>> We (at JetBrains) faced an issue with WebView after we've moved to 
>>> an JFX update in JDK8u202. The issue is that WebView stopped loading 
>>> images referenced by an absolute URL under some circumstances.
>>> Below is a real html content, produced by IDEA markdown viewer. It 
>>> has lots of style pre-loads and a sample image that it should 
>>> eventually display. The html is loaded view 
>>> WebEngine.loadContent(..) but a placeholder text is only displayed - 
>>> that's the problem that can be reproduce with JDK8u202. However it 
>>> worked with JDK8u152.
>>> The style references will obviously fail for you, but if you put 
>>> this html into a file and will load it via 
>>> WebEngine.load(file:///path/to/file), the image will be shown with 
>>> no problem (in 8u202 as well).
>>> <html><head><meta http-equiv="Content-Security-Policy" 
>>> content="default-src 'none'; script-src 
>>> http://localhost:63344/api/markdown-preview/scripts/processLinks.js?_ijt=ujioejund46k8cmdcsuggbpnf3 
>>> http://localhost:63344/api/markdown-preview/scripts/scrollToElement.js?_ijt=ujioejund46k8cmdcsuggbpnf3; 
>>> style-src https: 
>>> http://localhost:63344/api/markdown-preview/styles/default.css?_ijt=ujioejund46k8cmdcsuggbpnf3 
>>> http://localhost:63344/api/markdown-preview/styles/darcula.css?_ijt=ujioejund46k8cmdcsuggbpnf3 
>>> http://localhost:63344/api/markdown-preview/styles/inline.css?_ijt=ujioejund46k8cmdcsuggbpnf3; 
>>> img-src *; connect-src 'none'; font-src *; object-src 'none'; 
>>> media-src 'none'; child-src 'none';"/><link rel="stylesheet" 
>>> href="http://localhost:63344/api/markdown-preview/styles/default.css?_ijt=ujioejund46k8cmdcsuggbpnf3" 
>>> />
>>> <script 
>>> src="http://localhost:63344/api/markdown-preview/scripts/processLinks.js?_ijt=ujioejund46k8cmdcsuggbpnf3"></script>
>>> <script 
>>> src="http://localhost:63344/api/markdown-preview/scripts/scrollToElement.js?_ijt=ujioejund46k8cmdcsuggbpnf3"></script></head><body 
>>> md-src-pos="0..89"><p md-src-pos="0..88"><img 
>>> src="file:///C:/Users/tav/IdeaProjects/DummyProject/src/kitten.jpg" 
>>> alt="Kitten" title="A cute kitten" md-src-pos="0..88" 
>>> /></p></body></html>
>>> Then, if you remove all the style loading and leave only the image, 
>>> the image will be shown in either way: load(url) or loadContent (in 
>>> 8u202)
>>> <html><head></head><body md-src-pos="0..89"><p 
>>> md-src-pos="0..88"><img 
>>> src="file:///C:/Users/tav/IdeaProjects/DummyProject/src/kitten.jpg" 
>>> alt="Kitten" title="A cute kitten" md-src-pos="0..88" 
>>> /></p></body></html>
>>> Sorry for not submitting the code, I hope you will easily put it 
>>> into a real demo (I played with JFX's WebViewApp).
>>> So, could you please advice on what went wrong with it?
>>> With regards,
>>> Anton.

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