I have a strange problem with wkhtmltopdf executed from PHP. My PHP code looks like this:
<?php exec('wkhtmltopdf --header-html "http://example.com/pdf-header" --footer_html "http://example.com/pdf-footer" /tmp/pdf.html /tmp/pdf.pdf'); ?>
When I execute the same command from shell, it works perfectly. However, when I try to run it from PHP like mentioned above, the script runs until it time outs resulting in empty PDF file.
As I searched web, I tried to run it with
> /tmp/error_log.txt 1>&2 parameter and I found out when executed from PHP it returns error:
Exit with code 1 due to network error: ProtocolUnknownError
More interestingly, when I delete
--header-html it works fine executed from PHP. But obviously the resulting PDF is missing header and footer.
Header and footer HTML doesn’t have any external resource references. And I don’t think it is network / DNS problem because from commandline from the same server it works fine.
I would be very glad for any hints and tips, because this is driving me crazy. Thanks in advance.