CONTENT_LENGTH
GATEWAY_INTERFACE
HTTPS
HTTP_ACCEPT
HTTP_ACCEPT_ENCODING
HTTP_ACCEPT_LANGUAGE
HTTP_CONNECTION
HTTP_HOST
HTTP_USER_AGENT
INSTANCE_ID
LOCAL_ADDR
PATH_INFO
PATH_TRANSLATED
REMOTE_ADDR
REMOTE_HOST
REQUEST_METHOD
SCRIPT_NAME
SERVER_NAME
SERVER_PORT
SERVER_PORT_SECURE
SERVER_PROTOCOL
SERVER_SOFTWARE