Question

在symfony应用程序中，我使用knp_snappy生成PDF：

return new Response(
         $this->get('knp_snappy.pdf')->getOutput($url),
         200,
         array(
                 'Content-Type'          => 'application/pdf',
                'Content-Disposition'   => 'attachment; filename="file.pdf"'
                )
        );

但是我收到了这个错误：

The exit status code '1' says something went wrong:
stderr: "Loading pages (1/6)java version "1.7.0_79"

[more here ... cut for clarity]

OpenJDK Runtime Environment (IcedTea 2.5.6) (7u79-2.5.6-0ubuntu1.14.04.1)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)

(wkhtmltopdf:12934): Gtk-WARNING **: cannot open display:
"
stdout: ""
command: wkhtmltopdf --lowquality 'http://symfony.dev/app_dev.php/application/reporter/674/inventory' '/tmp/knp_snappy5643248854b563.21161953.pdf'.

请注意：

给定的$url确实有效并且是绝对URL（因为它包含CSS的链接）。
如果我使用 $this->get('knp_snappy.pdf')->getOutputFromHtml($html)代替$this->get('knp_snappy.pdf')->getOutput($url) 这一切都很好，但后来我无法加载CSS（这是正常的行为）

Answer 1

The point was that the requested URL was behind a firewall, so wkhtmltopdf was recieving a 302 access denied.

For knp_snappy users facing the same problem, the solution is really well explained here and here.

Hope that helps!

symfony + knp_snappy：gtk-WARNING无法打开显示

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