Why does PDFKit/wkhtmltopdf hang but renders PDF as expected when Rails app is killed?

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The problem is with wkhtmltopdf itself, specifically, any version after 0.9.9. wkhtmltopdf hangs when run directly from the command-line.

Steps to correct:

brew uninstall wkhtmltopdf
cd /usr/local/Library/Formula/
git checkout 6e2d550 /usr/local/Library/Formula/wkhtmltopdf.rb
brew install wkhtmltopdf

Then verify the correct version is installed wkhtmltopdf --version which should yield wkhtmltopdf 0.9.9

Citations:

  1. https://github.com/mileszs/wicked_pdf/issues/110
  2. http://wearepandr.com/blog/article/homebrew-and-installing-old-package-versions#blog_nav

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