Re: issue between rainbows/unicorn 5.0.0 and rack on ruby >= 1.9.1

[Dan Kegel <dank@kegel.com>]

On Wed, Jul 13, 2016 at 1:24 PM, Eric Wong <e@80x24.org> wrote:
> Actually, I believe the onus is on the application to produce a
> correct response body for the application server to use.

I work with Kevin, and helped track this down.  Neither of us use Ruby
much, hence our difficulty.
I'm posting a followup here in case others in a similar spot happen
across this thread.

One problem was in our rackup.ru (I'll show a bit more code than
needed, to be kind to newbies):

class AppendSlash
  def initialize(app, options={})
    @app = app
    @base = options[:base]
  end
  def call(env)
    if env['REQUEST_URI'] == @base
      [301, {
        'Content-Type' => 'text/html',
        'Location' =>  @base + '/'
        }, '']
    else
      @app.call(env)
    end
  end
end

The fix was to change
        }, '']
to
        }, ['']]

Likewise, in a few of our apps, we had to change

      [200, {
          'Content-Type' => 'text/plain',
          'Content-Length' => data.length.to_s
        }, data
      ]

to

      [200, {
          'Content-Type' => 'text/plain',
          'Content-Length' => data.length.to_s
        }, [data]
      ]

The question was also asked at https://github.com/rack/rack/issues/1096
so I'll follow up there, too.

Thanks!
- Dan