Unexpected error while processing request: uninitialized constant Rack::Request::Helpers::HTTP_HOST

[hadmut]

Hi,

I just tried the simple sinatra example of running

require 'sinatra'

get '/' do
'Hello world!'
end

(based on rack) and ran into

% ruby sitest.rb
/var/lib/gems/2.3.0/gems/rack-2.0.1/lib/rack/show_exceptions.rb:16: warning: already initialized constant Rack::ShowExceptions::CONTEXT
/usr/lib/ruby/vendor_ruby/rack/showexceptions.rb:16: warning: previous definition of CONTEXT was here
/var/lib/gems/2.3.0/gems/rack-2.0.1/lib/rack/show_exceptions.rb:114: warning: already initialized constant Rack::ShowExceptions::TEMPLATE
/usr/lib/ruby/vendor_ruby/rack/showexceptions.rb:115: warning: previous definition of TEMPLATE was here
== Sinatra (v1.4.7) has taken the stage on 4567 for development with backup from Thin
Thin web server (v1.6.3 codename Protein Powder)
Maximum connections set to 1024
Listening on localhost:4567, CTRL+C to stop
Unexpected error while processing request: uninitialized constant Rack::Request::Helpers::HTTP_HOST
/var/lib/gems/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:229:in host_with_port' /var/lib/gems/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:235:in host'
(erb):124:in pretty' /usr/lib/ruby/2.3.0/erb.rb:864:in eval'
/usr/lib/ruby/2.3.0/erb.rb:864:in result' /var/lib/gems/2.3.0/gems/rack-2.0.1/lib/rack/show_exceptions.rb:96:in pretty'
/usr/lib/ruby/vendor_ruby/sinatra/show_exceptions.rb:34:in rescue in call' /usr/lib/ruby/vendor_ruby/sinatra/show_exceptions.rb:25:in call'
/usr/lib/ruby/vendor_ruby/sinatra/base.rb:182:in call' /usr/lib/ruby/vendor_ruby/sinatra/base.rb:2013:in call'
/usr/lib/ruby/vendor_ruby/sinatra/base.rb:1487:in block in call' /usr/lib/ruby/vendor_ruby/sinatra/base.rb:1787:in synchronize'
/usr/lib/ruby/vendor_ruby/sinatra/base.rb:1487:in call' /usr/lib/ruby/vendor_ruby/thin/connection.rb:86:in block in pre_process'
/usr/lib/ruby/vendor_ruby/thin/connection.rb:84:in catch' /usr/lib/ruby/vendor_ruby/thin/connection.rb:84:in pre_process'
/usr/lib/ruby/vendor_ruby/eventmachine.rb:1054:in call' /usr/lib/ruby/vendor_ruby/eventmachine.rb:1054:in block in spawn_threadpool'

Has trouble finding the definition of HTTP_HOST

[PingLord]

Same here

Listening on 0.0.0.0:8003, CTRL+C to stop
Unexpected error while processing request: uninitialized constant Rack::Request::Helpers::HTTP_HOST
/home/user/.gem/ruby/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:229:in host_with_port' /home/user/.gem/ruby/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:235:in host'
(erb):124:in pretty' /usr/lib/ruby/2.3.0/erb.rb:864:in eval'
/usr/lib/ruby/2.3.0/erb.rb:864:in result' /home/sebastian/.gem/ruby/2.3.0/gems/rack-2.0.1/lib/rack/show_exceptions.rb:96:in pretty'
/usr/lib/ruby/vendor_ruby/sinatra/show_exceptions.rb:34:in rescue in call' /usr/lib/ruby/vendor_ruby/sinatra/show_exceptions.rb:25:in call'
/usr/lib/ruby/vendor_ruby/sinatra/base.rb:182:in call' /usr/lib/ruby/vendor_ruby/sinatra/base.rb:2013:in call'
/usr/lib/ruby/vendor_ruby/sinatra/base.rb:1487:in block in call' /usr/lib/ruby/vendor_ruby/sinatra/base.rb:1787:in synchronize'
/usr/lib/ruby/vendor_ruby/sinatra/base.rb:1487:in call' /usr/lib/ruby/vendor_ruby/thin/connection.rb:86:in block in pre_process'
/usr/lib/ruby/vendor_ruby/thin/connection.rb:84:in catch' /usr/lib/ruby/vendor_ruby/thin/connection.rb:84:in pre_process'
/usr/lib/ruby/vendor_ruby/eventmachine.rb:1054:in call' /usr/lib/ruby/vendor_ruby/eventmachine.rb:1054:in block in spawn_threadpool'

The code :

require 'sinatra'

set :bind, '0.0.0.0'
set :port, 8003


get '/' do

  erb :get_users
end

get_users.erb templace is empty.

[jeremyevans]

Rack::HTTP_HOST has been set since 131d9fd. Constant lookup of HTTP_HOST inside Rack::Request::Helpers#host_with_port should find Rack::HTTP_HOST. I'm not sure if this is an issue with an old version of Sinatra, or related to Thin, but it doesn't appear to be a problem with Rack itself. If you still believe this is a problem with Rack itself, please submit a failing test or self-contained example showing the problem, without using any other libraries.