troubleshooting

How to resolve "Cannot create a QPixmap when no GUI is being used" when running wkhtmltopdf

Few days ago, I got a request from my customer to make changes to PDF exporting feature which involve putting watermark inside PDF file. The existing setup in the project was like this: all necessary information are presented in HTML file and then this HTML file is converted into PDF

rails

How to fix 403 Fobidden issue on Nginx + Rails application

I have been setting up many servers for several clients using the combination of Nginx + Passenger or Nginx + Unicorn. And one of the most common issues I see when installing and configuring Nginx is 403 Forbidden error. And in this post, I am going to point out several reasons and

rails

Resolve CORS fonts issue on Firefox (and now Chrome too) with Rails assets pipeline

Update If you are having this issue with CloudFront and you have access to Nginx or Apache server, you should read this post: Correct configuration to fix CORS issue with CloudFront When using custom fonts such as FontAwesome or Glyphicon, you might realize that some icons disappear on Firefox (or

troubleshooting

How to install wkhtmltopdf on OSX (August 2014)?

Today, when trying to install wkhtmltopdf package to my Mac via brew, I got the following error: Error: No available formula for wkhtmltopdf I have searched on the Internet and realized that this package was removed from brew. But you still can install it via homebrew-boneyard - Archive of formula