diff --git a/include/types/backend.h b/include/types/backend.h
index 6d576b8..9f15c08 100644
--- a/include/types/backend.h
+++ b/include/types/backend.h
@@ -42,7 +42,8 @@
 #define BE_LB_ALGO_SH	(BE_LB_PROP_L4  | 0x02) /* balance on source IP hash */
 #define BE_LB_ALGO_UH	(BE_LB_PROP_L7  | 0x03) /* balance on URI hash */
 #define BE_LB_ALGO_PH	(BE_LB_PROP_L7  | 0x04) /* balance on URL parameter hash */
-#define BE_LB_ALGO_LC	(BE_LB_PROP_DYN | 0x05) /* fast weighted round-robin mode (dynamic) */
+#define BE_LB_ALGO_LC	(BE_LB_PROP_DYN | 0x05) /* fast weighted leastconn mode (dynamic) */
+#define BE_LB_ALGO_HH	(BE_LB_PROP_L7  | 0x06) /* balance on Http Header value */
 
 /* various constants */
 
diff --git a/include/types/proxy.h b/include/types/proxy.h
index 48d0a82..3cb60c0 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -199,6 +199,9 @@
 	unsigned url_param_post_limit;		/* if checking POST body for URI parameter, max body to wait for */
 	int  uri_len_limit;			/* character limit for uri balancing algorithm */
 	int  uri_dirs_depth1;			/* directories+1 (slashes) limit for uri balancing algorithm */
+	char *hh_name;				/* name of the header parameter used for hashing */
+	int  hh_len;				/* strlen(hh_name), computed only once */
+	int  hh_match_domain;			/* toggle use of special match function */
 	char *appsession_name;			/* name of the cookie to look for */
 	int  appsession_name_len;		/* strlen(appsession_name), computed only once */
 	int  appsession_len;			/* length of the appsession cookie value to be used */