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The Gradle task downloadPdfJs was added to avoid including all files related to the PDF.js library in the repository. This ensures the library is downloaded and cached during the build process, keeping the repository clean and lightweight.

Note: I don't think we need to do it now, but we could possibly add unit tests for the helper methods you created (isContentTypeApplicationPdf, checkPdfByRequest, downloadPdfToCache). We could possibly move these methods to a helper class (e.g. OSIABPdfHelper) and then use then create an instance of that class to run unit tests on.

Results from testing in Pixel 7 and Pixel 9 Pro Android 16 devices:

• When opening a URL for a PDF, when clearCache is true, when I close and reopen the WebView in the same PDF, the PDF opens where I had left it (same page).
• The zoom parameter doesn't make a difference. This is probably because pdf.js has their own zoom implementation, but if it doesn't work then we should state in the documentation that the zoom option won't have an effect when the URL is for a PDF file.

Results of second test:

I think the OnPageNavigationCompleted event might be being triggered too often when opening a PDF. I tested opening the PDF and then scrolling down to page number 3, and this triggered the event 2 or 3 times. Is this supposed to happen?