requestオブジェクト
参考
AUTH_TYPE : request.auth_type
CONTENT_LENGTH : request.content_length
CONTENT_TYPE : request.content_type
GATEWAY_INTERFACE : request.gateway_interface
PATH_INFO : request.path_info
PATH_TRANSLATED : request.path_translated
QUERY_STRING : request.query_string
REMOTE_ADDR : request.remote_addr
REMOTE_HOST : request.remote_host
REMOTE_IDENT : request.remote_ident
REMOTE_USER : request.remote_user
REQUEST_METHOD : request.request_method
SCRIPT_NAME : request.script_name
SERVER_NAME : request.server_name
SERVER_PORT : request.server_port
SERVER_PROTOCOL : request.server_protocol
SERVER_SOFTWARE : request.server_software
HTTP_ACCEPT : request.accept
HTTP_ACCEPT_CHARSET : request.accept_charset
HTTP_ACCEPT_ENCODING : request.accept_encoding
HTTP_ACCEPT_LANGUAGE : request.accept_language
HTTP_CACHE_CONTROL : request.cache_control
HTTP_FROM : request.from
HTTP_HOST : request.host
HTTP_NEGOTIATE : request.negotiate
HTTP_PRAGMA : request.pragma
HTTP_REFERER : request.referer
HTTP_USER_AGENT : request.user_agent
HTTP_COOKIE : request.raw_cookie
HTTP_COOKIE2 : request.raw_cookie2
REQUEST_URI : request.request_uri
