Hello all, (I''m using Webrick and Rails 0.13) I have an application where I don''t need sessions, so I followed the instructions on http://wiki.rubyonrails.com/rails/show/HowtoChangeSessionOptions and set ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS=false in my environment.rb file to de-activate them. I restarted webrick and I got this error the first time I made a request: #<TypeError: cannot convert nil into Array> ["e:/ruby/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/webrick_server.rb:111:in `concat''", "e:/ruby/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/webrick_server.rb:111:in `handle_dispatch''", "e:/ruby/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/webrick_server.rb:69:in `service''", "e:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''", "e:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:155:in `start_thread''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start_thread''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:94:in `start''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:89:in `each''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:89:in `start''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start''", "e:/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start''", "e:/ruby/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/webrick_server.rb:55:in `dispatch''", "script/server:49"] This is the code in webrick_server.rb around line 111: 101 def handle_dispatch(req, res, origin = nil) 102 data = StringIO.new 103 Dispatcher.dispatch( 104 CGI.new("query", create_env_table(req, origin), StringIO.new(req.body || "")), 105 ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS, 106 data 107 ) 108 109 header, body = extract_header_and_body(data) 110 assign_status(res, header) 111 res.cookies.concat(header.delete(''set-cookie'')) ... [...] 122 end What I understood is the following: 1. At line 103, Dispatcher.dispatch is called with false as his second argument (line 105); 2. This argument being false, no session will be created and no ''set-cookie'' header will be added to the HTTP response; 3. At line 111, the delete call on the header object (which is a hash) will return nil, because there is no ''set-cookie'' header and because Hash#delete returns the hash default value (which is nil by default) when the key passed as parameter doesn''t exist 4. res.cookies.concat fails because it receives nil as parameter So I changed line 111 to the following and everything worked well: res.cookies.concat(header.delete(''set-cookie'')) if(header.has_key?(''set-cookie'')) Is this correct? (I''m using Rails 0.13) Thanks - Xavier