Return the request URI, accounting for server idiosyncracies. WEBrick includes the full URL. IIS leaves REQUEST_URI blank.

Source Code

# File action_controller/request.rb, line 230
def request_uri
  if uri = @env['REQUEST_URI']
    # Remove domain, which webrick puts into the request_uri.
    (%r{^\w+\://[^/]+(/.*|$)$} =~ uri) ? $1 : uri
  else
    # Construct IIS missing REQUEST_URI from SCRIPT_NAME and PATH_INFO.
    script_filename = @env['SCRIPT_NAME'].to_s.match(%r{[^/]+$})
    uri = @env['PATH_INFO']
    uri = uri.sub(/#{script_filename}\//, '') unless script_filename.nil?
    unless (env_qs = @env['QUERY_STRING']).nil? || env_qs.empty?
      uri << '?' << env_qs
    end

    if uri.nil?
      @env.delete('REQUEST_URI')
      uri
    else
      @env['REQUEST_URI'] = uri
    end
  end
end