How to solve “certificate verify failed” on Windows?

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Actually the best way I found to solve this in windows for Ruby itself, not just one gem, is to do the following:

  1. Download https://curl.haxx.se/ca/cacert.pem into c:\railsinstaller\cacert.pem. Make sure you save it as a .pem file, rather than a text file.
  2. Go to your Computer -> Advanced Settings -> Environment Variables

  3. Create a new System Variable:

    Variable: SSL_CERT_FILE
    Value: C:\RailsInstaller\cacert.pem

  4. Close all your command prompts, including your Rails server command prompt, etc.

  5. Start a new ruby irb prompt, and try the following:

    $irb>require 'open-uri'
$irb>open('https://www.gmail.com')

It should all work now just fine.

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