class WebMock::RackResponse

def build_rack_env(request)
  uri = request.uri
  headers = (request.headers || {}).dup
  body = request.body || ''
  env = {
    # CGI variables specified by Rack
    'REQUEST_METHOD' => request.method.to_s.upcase,
    'CONTENT_TYPE'   => headers.delete('Content-Type'),
    'CONTENT_LENGTH' => body.bytesize,
    'PATH_INFO'      => uri.path,
    'QUERY_STRING'   => uri.query || '',
    'SERVER_NAME'    => uri.host,
    'SERVER_PORT'    => uri.port,
    'SCRIPT_NAME'    => ""
  }
  env['HTTP_AUTHORIZATION'] = 'Basic ' + [uri.userinfo].pack('m').delete("\r\n") if uri.userinfo
  # Rack-specific variables
  env['rack.input']      = StringIO.new(body)
  env['rack.errors']     = $stderr
  if !Rack.const_defined?(:RELEASE) || Rack::RELEASE < "3"
    env['rack.version']    = Rack::VERSION
  end
  env['rack.url_scheme'] = uri.scheme
  env['rack.run_once']   = true
  env['rack.session']    = session
  env['rack.session.options'] = session_options
  headers.each do |k, v|
    env["HTTP_#{k.tr('-','_').upcase}"] = v
  end
  env
end