Error handling when pdf.js fetch data from another server

[LOGANLEEE]

I'm using viewer.html?file=\APICall\ and it works really well.
But sometimes server will return corrupted file or encoded file on purpose.
In that case, i want to execute window.location.href = \APICall\ to download that file.

summaries of this question) if viewer.html has any kind of error then execute window.location.href script to download directly.

can i get help?

Really appreciate of your effort that built this lib.
thanks.

[Snuffleupagus]

First of all, please keep in mind that this is, first and foremost, a bug tracker and not a general support forum.

[...] if viewer.html has any kind of error then execute window.location.href script to download directly.

It's not at all clear what window.location.href has to do with PDF files that fail to load, but it might be possible to trigger downloading from the loadingTask.promise rejection handler; e.g. in

pdf.js/web/app.js

Lines 682 to 709 in 2cc0bfd

	}, (exception) => {
	if (loadingTask !== this.pdfLoadingTask) {
	return undefined; // Ignore errors for previously opened PDF files.
	}
	let message = exception && exception.message;
	let loadingErrorMessage;
	if (exception instanceof InvalidPDFException) {
	// change error message also for other builds
	loadingErrorMessage = this.l10n.get('invalid_file_error', null,
	'Invalid or corrupted PDF file.');
	} else if (exception instanceof MissingPDFException) {
	// special message for missing PDF's
	loadingErrorMessage = this.l10n.get('missing_file_error', null,
	'Missing PDF file.');
	} else if (exception instanceof UnexpectedResponseException) {
	loadingErrorMessage = this.l10n.get('unexpected_response_error', null,
	'Unexpected server response.');
	} else {
	loadingErrorMessage = this.l10n.get('loading_error', null,
	'An error occurred while loading the PDF.');
	}
	return loadingErrorMessage.then((msg) => {
	this.error(msg, { message, });
	throw new Error(msg);
	});
	});

Finally, without all of the information requested in https://github.com/mozilla/pdf.js/blob/master/.github/ISSUE_TEMPLATE.md this issue will be closed as INVALID. See also https://github.com/mozilla/pdf.js/blob/master/.github/CONTRIBUTING.md (emphasis mine):

If you are developing a custom solution, first check the examples at https://github.com/mozilla/pdf.js#learning and search existing issues. If this does not help, please prepare a short well-documented example that demonstrates the problem and make it accessible online on your website, JS Bin, GitHub, etc. before opening a new issue or contacting us on the IRC channel -- keep in mind that just code snippets won't help us troubleshoot the problem.

[LOGANLEEE]

Thank you for your reply.
for more detail, i put buildandwebfolder to public folder of react project.

To call viewer i did window.open('blabla/web/viewer.html?file=\API call address\', '_blank')
then server return requested file to viewer.html.

The purpose of `window.location.href' is just calling Download API and is going to be returned File that i requested from server if the request file isn't fit for viewer call method.

Because some files would be encrypted or corrupted according to company's security policy.

If so, viewer will emit error messages (Invalid PDF structure , ... etc) then excute `window.location.href' to make api call from browser to download it directly and user will decode it by decoding program which is installed in user's local PC.

[Snuffleupagus]

for more detail, i put buildandwebfolder to public folder of react project.

That's not at all the details requested here, nor is it anywhere near sufficient information, please actually take the time to read and follow all of #10928 (comment) carefully!

Besides, #10928 (comment) even outlines a possible solution: Did you actually try calling this.download() from the loadingTask.promise rejection handler mentioned above?

[timvandermeij]

Closing until all of the details are provided.