HDR_ETAG, /**< RFC 2608, 2616 */
HDR_EXPECT, /**< RFC 2616, 2616 */
HDR_EXPIRES, /**< RFC 2608, 2616 */
+ HDR_FORWARDED, /**< RFC 7239 */
HDR_FROM, /**< RFC 2608, 2616 */
HDR_HOST, /**< RFC 2608, 2616 */
HDR_HTTP2_SETTINGS, /**< HTTP/2.0 upgrade header. see draft-ietf-httpbis-http2-04 */
HDR_AUTHENTICATION_INFO, /**< RFC 2617 */
HDR_X_CACHE, /**< Squid custom header */
HDR_X_CACHE_LOOKUP, /**< Squid custom header. temporary hack that became de-facto. TODO remove */
- HDR_X_FORWARDED_FOR, /**< Squid custom header */
+ HDR_X_FORWARDED_FOR, /**< obsolete Squid custom header */
HDR_X_REQUEST_URI, /**< Squid custom header appended if ADD_X_REQUEST_URI is defined */
HDR_X_SQUID_ERROR, /**< Squid custom header on generated error responses */
#if X_ACCELERATOR_VARY