ERR_BLOCKED_BY_CLIENT

[Wei Nee Teh]

Good afternoon,

I am working on a project which enables users to send and download pdf files. There is a problem with downloading pdf files as I get the ERR_BLOCKED_BY_CLIENT error message. Viewing of said pdf working in Firefox, but not on Chrome. May I know if this is an expected behaviour? Thank you in advance.

[PhistucK]

What about in incognito mode? If it works, then it might be blocked by an extension.

If it is still not working, it might be a conflict with the content security policy of the page (I cannot remember whether that was solved already).

☆PhistucK

On Mon, Mar 22, 2021 at 2:08 PM Wei Nee Teh <wei...@djavafactory.com> wrote:

Good afternoon,

I am working on a project which enables users to send and download pdf files. There is a problem with downloading pdf files as I get the ERR_BLOCKED_BY_CLIENT error message. Viewing of said pdf working in Firefox, but not on Chrome. May I know if this is an expected behaviour? Thank you in advance.

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[Joe DeBlasio]

ERR_BLOCKED_BY_CLIENT is pretty widely used, so it's hard to tell whether what's happening is working as intended or not without additional details.

PhistucK's suggestion about extensions is a good one. A few other plausible explanations might include:

• If you're serving your PDFs with the 'sandbox' attribute to the Content-Security-Policy header, you may be hitting crbug.com/1187122 . This is fixed in Chrome 91 or higher. A workaround is to drop the sandbox CSP attribute for PDFs.
• If you're providing a link to a PDF on your page, and that page with the link is on an HTTPS page and the PDF is hosted on an HTTP page, you may be hitting our mixed download blocking.

If none of those fit your situation, we'd need more context to help you out.

[Wei Nee Teh]

I have just gotten the Chrome 91 update and it is working fine now. Thank you very much for the fix!

[Hagen Rahn]

I can confirm that an upgrade to Chrome 91+ solves the issue. Thanks for the fix,

[Giedrius Tuminauskas]

The issue is still there on Chrome 108.* when using simple HREF link with target _blank and CSP set - displays: ERR_BLOCKED_BY_CLIENT
Though, if you try to open PDF document directly on Chrome in the new tab - it works

[Michał Szarek]

Not sure if it is going to help You. So I was working on displaying pdf files in new tab, I have some documents stored on the server and I was fetching content of document then I was generating blob in order to generate url so I could open file in different tab. It was working fine until I was receiving  ERR_BLOCKED_BY_CLIENT error.
I was playing around with this issue for a while and I found strange behaviour when I had a link with static href to pdf file and targer _blank I was not able to display it when I clicked with left mouse button. However when I clicked using ctrl + left mouse button new tab was open and pdf file is displayed perfectly. You might try to dispatch mouse event with ctrlKey set to true.

        const element = document.createElement("a")

        element.setAttribute("href", url)

        element.setAttribute("target", "_blank")

        document.body.appendChild(element)

        element.dispatchEvent(new MouseEvent("click", {

            ctrlKey: true

        }))

        element.remove()

Hope it's going to help You, please let me know if that solves the issue

[Shubham Vishi]

Thanks Michal!

This solution is working for me but any idea what's the difference here? 

Why is it not working with normal click but working with Ctrl Click?

[Shubham Vishi]

Hi Giedrius,

I am facing the same issue, was there any solution found for this?

Thanks,

Shubham

[swapnil masutage]

I am still having the same issue on Chrome Browser version 120. The workaround mentioned by Michał Szarek is working for me. 

Why is it not working with normal click but working with Ctrl Click?

Any idea about this issue? I am a non-dev background.

Thank you.

[Glassisimooptic]

I found that  download and using this extension help

https://chromewebstore.google.com/detail/adobe-acrobat-pdf-edit-co/efaidnbmnnnibpcajpcglclefindmkaj?hl=th&utm_source=ext_sidebar