Rack::Request object environment variables example

gistfile1.txt

#<Rack::Request:0x007f92241da138
 @env=
  {"GATEWAY_INTERFACE"=>"CGI/1.1",
   "PATH_INFO"=>"",
   "QUERY_STRING"=>"",
   "REMOTE_ADDR"=>"127.0.0.1",
   "REMOTE_HOST"=>"localhost",
   "REQUEST_METHOD"=>"GET",
   "REQUEST_URI"=>"http://localhost:9292/sum/1/b",
   "SCRIPT_NAME"=>"/sum/1/b",
   "SERVER_NAME"=>"localhost",
   "SERVER_PORT"=>"9292",
   "SERVER_PROTOCOL"=>"HTTP/1.1",
   "SERVER_SOFTWARE"=>"WEBrick/1.3.1 (Ruby/2.1.2/2014-05-08)",
   "HTTP_HOST"=>"localhost:9292",
   "HTTP_USER_AGENT"=> "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Firefox/31.0",
   "HTTP_ACCEPT"=> "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
   "HTTP_ACCEPT_LANGUAGE"=>"en-US,en;q=0.5",
   "HTTP_ACCEPT_ENCODING"=>"gzip, deflate",
   "HTTP_COOKIE"=> "",
   "HTTP_CONNECTION"=>"keep-alive",
   "HTTP_CACHE_CONTROL"=>"max-age=0",
   "rack.version"=>[1, 2],
   "rack.input"=> #<Rack::Lint::InputWrapper:0x007f92241da278
     @input=#<StringIO:0x007f92241e25e0>>,
   "rack.errors"=> #<Rack::Lint::ErrorWrapper:0x007f92241da200
     @error=#<IO:<STDERR>>>,
   "rack.multithread"=>true,
   "rack.multiprocess"=>false,
   "rack.run_once"=>false,
   "rack.url_scheme"=>"http",
   "HTTP_VERSION"=>"HTTP/1.1",
   "REQUEST_PATH"=>"/sum/1/b"}>