Rails 'parse_query' error on server in brand new app

Question

I have installed on OS X 10.10.3: homebrew, command line tools, then installed ruby using rbenv:

ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
         


        

Answer 1

I was getting the same thing, but with Rails 4.2.1, and running on Puma 2.11.3.

I noticed that Bundler just upgraded rack to 1.6.3. Setting the version back to 1.6.2 resolved it for me.

Answer 2

The issue is here: https://github.com/rails/rails/issues/20624

To solve it, change in your Gemfile:

gem 'rack', '1.6.1'