Failing to load some PDFs using PdfViewer.uri

[AndyDavidJoyce]

Hi,

First off, thanks for the great package! I've been testing it, and most PDFs load without any issues. However, I’ve encountered a few that don’t seem to load—for example, https://www.st.com/resource/en/data_brief/nucleo-wb05kz.pdf.

I'm using errorBannerBuilder to handle errors, but it doesn’t get triggered. Instead, the loading widget remains stuck indefinitely. Here’s the code I’m using:

PdfViewer.uri(
  Uri.parse('https://www.st.com/resource/en/data_brief/nucleo-wb05kz.pdf'),
  params: PdfViewerParams(
    panAxis: PanAxis.aligned,
    backgroundColor: context.theme.scaffoldBackgroundColor,
    loadingBannerBuilder: (context, bytesDownloaded, totalBytes) {
      return const CircularProgressIndicator();
    },
    errorBannerBuilder: (context, error, stackTrace, documentRef) {
      print('Stacktrace $stackTrace');
      return SizedBox.shrink();
    },
  ),
);

It seems like loadingBannerBuilder at the start and totalBytes is null. After that it is not called again.

Any idea what might be causing this?

Thanks!

[espresso3389]

It seems to be a server side issue but anyway I want to fix the nearly infinite(?) blocking issue.

Once the file is downloaded, the file is correctly shown in the viewer.

[nirmal-kc]

+1

Any updates on this one?

I am facing similar infinite loading issue. I have few pdfs which I cannot share due to privacy concerns. However, the pdf url https://cdn.syncfusion.com/content/PDFViewer/flutter-succinctly.pdf has the same issue. Please note that this loads on Web, and the issue persists only on IOS & Android.

[espresso3389]

~~@nirmal-kc Your PDF is correctly shown in the viewer. Possibly, different issue?~~

By the way, the ultimate cause of the issue is http.Request.send's blocking and I have googled it several times but I didn't find any cure for that...

[nirmal-kc]

@espresso3389, hmmmmm let me see if I can look into this one. For now, I tried switching the pfd's location to a different cloud path, and the issue just vanished. It is working for now, but will still try to search for multiple pdf's from the same host.

[espresso3389]

@nirmal-kc, your issue seems to be a different issue and should be discussed on #330.

[espresso3389]

For the original issue, now the viewer immediately returns error; it means it does not fix the loading error but it no longer stucks indefinitely.

So anyway, I don't close the issue anyway.

[espresso3389]

I want to close the issue anyway. If you find any problems or such, please file a new issue again.