DOMPDF not showing images and writing empty tmp files via print module

Question

I recently moved a Drupal 7 website from my development server to my pre-production server, and the rendering of the images from both the Body field and various images fields stopped working.

I now see "Image not found" and the URL of the image (which is working when I click on it by the way) on the generated PDFs.

The URLs from the Body field look like this "/mywebsite/sites/default/files/myimage.jpg" and the URLs of the "Image" fields are complete URLs with "http://mydomainname.com/mywebsite/……".

www-data has access to the images files and can also write in /tmp. And it does, actually, every time I generate a PDF with images. But the files are empty:

$> find /tmp -name "*dompdf*" -ctime -1 | xargs ls -lArth
-rw------- 1 www-data www-data 0 janv.  4 15:30 /tmp/ca_dompdf_img_0DlQ4V
-rw------- 1 www-data www-data 0 janv.  4 16:01 /tmp/ca_dompdf_img_Tyvv8w
-rw------- 1 www-data www-data 0 janv.  4 16:27 /tmp/ca_dompdf_img_pa4m4V
-rw------- 1 www-data www-data 0 janv.  4 16:27 /tmp/ca_dompdf_img_5RzNHk
-rw------- 1 www-data www-data 0 janv.  4 16:28 /tmp/ca_dompdf_img_T21gUJ
-rw------- 1 www-data www-data 0 janv.  4 16:29 /tmp/ca_dompdf_img_OmWxt2
-rw------- 1 www-data www-data 0 janv.  4 16:33 /tmp/ca_dompdf_img_SmA57m

I tried checking "Access images via local file access" in the "print" configuration page, but with no luck.

This may be an issue related to the server configuration, since it was working before on the development server, but I'm running out of ideas…

Answer 1

It's because your permission is -rw------- which only has read and write, there is no execute.

Use chmod -R 0775 sites/default/files

Answer 2

Apache's access log showed me the HTTP request originating from my server and trying to retrieve the images resulted in 401 errors. This was because of the htaccess authentication I had put up.