SERVER_NAME
SERVER_SIGNATURE
SERVER_PORT
DOCUMENT_ROOT
SCRIPT_FILENAME
REQUEST_URI
SCRIPT_NAME
REMOTE_PORT
PATH
// Add the working directory.
PWD
REMOTE_ADDR
SERVER_SOFTWARE
QUERY_STRING
SERVER_ADDR
GATEWAY_INTERFACE=CGI/1.1
SERVER_PROTOCOL=HTTP/1.1
REQUEST_METHOD
SERVER_ADMIN=