Error trying to view PDFs with special characters


I’ve run into a problem trying to view PDF files on NextCloud. If I upload a PDF with a non [A-z_] character in it, the PDF view gives me an error when trying to view the document. I can download the file and view it just fine using the desktop client or via the main NextCloud web app. But if I try and view it, I get the this error:

If I rename the file so it only has [A-z_] characters then I can view it fine.

I can view images with special characters in them just fine so it seems to be specifically about the PDF viewer.

  • NextCloud Version: 21.0.2 (via official NextCloud Docker image)
  • Operating system and version: Debian stable

I am getting this recurring message in the logs but it doesn’t seem to be associated with the above issue:

Error: Cannot modify header information - headers already sent by (output started at /var/www/html/3rdparty/sabre/http/lib/Sapi.php:132) at /var/www/html/apps/dav/lib/Connector/Sabre/File.php#691

I haven’t made any changes to the config.php other than adding:

'skeletondirectory' => '',

Any help would be much appreciatedl.


Please use the search function of the forum FIRST before opening an new thread. there are number of threads related this problem e.g.:

Thanks for the link, very helpful.