W3TC_REF Htaccess Variable - Htaccess File

hfase01/Loaded-WP/master/.htaccess

DEFLATE, DOCUMENT_ROOT, ENV, force-no-vary, HTTP_COOKIE, HTTP_HOST, HTTP_USER_AGENT, HTTPS, no-gzip, POST, QUERY_STRING, REQUEST_FILENAME, REQUEST_METHOD, REQUEST_URI, SCRIPT_FILENAME, W3TC_ENC, W3TC_REF, W3TC_SSL, W3TC_UA

noahsw/highlight-hunter/master/website-production/public_html/.htaccess

DEFLATE, DOCUMENT_ROOT, ENV, HTTP_COOKIE, HTTP_HOST, HTTP_USER_AGENT, HTTPS, no-gzip, POST, Pragma, QUERY_STRING, REQUEST_FILENAME, REQUEST_METHOD, REQUEST_URI, SERVER_PORT, W3TC_ENC, W3TC_REF, W3TC_SSL, W3TC_UA

Apache