Given an HtmlUnit HtmlPage object, how do I get the URI of its Document?
The page object I have is the result of a long chain of `click()` calls (just in case you were wondering how I could have a page object without knowing the URL used to obtain it).

- The method `HtmlPage.getDocumentURI` is not implemented. 
- `HtmlPage.getOwnerDocument` returns null. 
- `page.executeJavaScript("return document.location").getJavaScriptResult()` also returns  null.

Any hints?
Given an HtmlUnit HtmlPage object, how do I get the URI of its Document?
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The page object I have is the result of a long chain of `click()` calls (just in case you were wondering how I could have a page object without knowing the URL used to obtain it).

- The method `HtmlPage.getDocumentURI` is not implemented. 
- `HtmlPage.getOwnerDocument` returns null. 
- `page.executeJavaScript("return document.location").getJavaScriptResult()` also returns  null.

Any hints?