OpenSSL error with Rails and Webpacker

I had this problem with Rails 5.1 while developing with Vue.js and spend quite a while trying to fix it:

21:41:04 web.1       | 2017-11-08 21:41:04 -0500: Rack app error handling request { GET /packs/hello_vue-91f189c8d8210aaf6471.js }
21:41:04 web.1       | #<OpenSSL::SSL::SSLError: SSL_connect SYSCALL returned=5 errno=0 state=unknown state>
...

First, I thought it is a problem of webpacker and tried various environment variables following this git issue: pack_tags don’t pick up custom host when running webpack-dev-server. But even updating webpacker to 3.0.2 doesn't help.

Later, I try to google ssl error with Rails and found this PR: Add back Https. So this problem can be solved by simply turning https setting to true in config/webpacker.yml for development environment !!

Hope this help someone else.