Generic "HTTP Error" when uploading PDFs via Media area, part II

[BearlyDoug]

In an update/continuation of abandoned (not by me) ticket #43310, I need to bring this issue back to the forefront. After one of my Co-workers and I did some additional testing, we have identified the "HTTP Error" is a result of some PHP versions not being able to generate thumbnails from the first page of a PDF (a change that was introduced within the 4.7 release).

The issue is that there is no fall-back option when WordPress is unable to generate thumbnails.

We loaded the ​Disable PDF Thumbnails plugin on the sites that were returning that "HTTP Error" and were able to successfully upload PDFs without any problems.

Wordpress should auto-detect PDF image thumbnail creation "http errors" and switch to the following fallback upon failure:

function makeworthy_disable_pdf_thumbnails() {
        $fallbacksizes = array(); 
        return $fallbacksizes;              
}            
add_filter('fallback_intermediate_image_sizes', 'makeworthy_disable_pdf_thumbnails');

The other thread (linked above) has some of our system information available, however, I can provide updated details (or FTP/WP-Admin access to the dev that fixes this), as needed.

[SergeyBiryukov]

Hi there,

Sorry you still haven't got a reply on #43310, but it's still open, so let's continue the discussion there. No need to create a new ticket for the same issue.