diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index 3db8e10f6..945d49cf5 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -112,6 +112,7 @@ unsigned int http_get_hdr(const struct http_msg *msg, const char *hname, int hle
 void http_init_txn(struct session *s);
 void http_end_txn(struct session *s);
 void http_reset_txn(struct session *s);
+void http_adjust_conn_mode(struct session *s, struct http_txn *txn, struct http_msg *msg);
 
 struct http_req_rule *parse_http_req_cond(const char **args, const char *file, int linenum, struct proxy *proxy);
 struct http_res_rule *parse_http_res_cond(const char **args, const char *file, int linenum, struct proxy *proxy);
diff --git a/src/proto_http.c b/src/proto_http.c
index 11177cb06..89e91a986 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -2393,6 +2393,59 @@ fail:
 	return 0;
 }
 
+void http_adjust_conn_mode(struct session *s, struct http_txn *txn, struct http_msg *msg)
+{
+	int tmp = TX_CON_WANT_KAL;
+
+	if (!((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA)) {
+		if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_TUN ||
+		    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_TUN)
+			tmp = TX_CON_WANT_TUN;
+
+		if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL ||
+		    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL)
+			tmp = TX_CON_WANT_TUN;
+	}
+
+	if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_SCL ||
+	    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_SCL) {
+		/* option httpclose + server_close => forceclose */
+		if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL ||
+		    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL)
+			tmp = TX_CON_WANT_CLO;
+		else
+			tmp = TX_CON_WANT_SCL;
+	}
+
+	if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_FCL ||
+	    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_FCL)
+		tmp = TX_CON_WANT_CLO;
+
+	if ((txn->flags & TX_CON_WANT_MSK) < tmp)
+		txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | tmp;
+
+	if (!(txn->flags & TX_HDR_CONN_PRS) &&
+	    (txn->flags & TX_CON_WANT_MSK) != TX_CON_WANT_TUN) {
+		/* parse the Connection header and possibly clean it */
+		int to_del = 0;
+		if ((msg->flags & HTTP_MSGF_VER_11) ||
+		    ((txn->flags & TX_CON_WANT_MSK) >= TX_CON_WANT_SCL &&
+		     !((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA)))
+			to_del |= 2; /* remove "keep-alive" */
+		if (!(msg->flags & HTTP_MSGF_VER_11))
+			to_del |= 1; /* remove "close" */
+		http_parse_connection_header(txn, msg, to_del);
+	}
+
+	/* check if client or config asks for explicit close in KAL/SCL */
+	if (((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
+	     (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL) &&
+	    ((txn->flags & TX_HDR_CONN_CLO) ||                         /* "connection: close" */
+	     (!(msg->flags & HTTP_MSGF_VER_11) && !(txn->flags & TX_HDR_CONN_KAL)) || /* no "connection: k-a" in 1.0 */
+	     !(msg->flags & HTTP_MSGF_XFER_LEN) ||                     /* no length known => close */
+	     s->fe->state == PR_STSTOPPED))                            /* frontend is stopping */
+		txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | TX_CON_WANT_CLO;
+}
 
 /* This stream analyser waits for a complete HTTP request. It returns 1 if the
  * processing can continue on next analysers, or zero if it either needs more
@@ -2929,58 +2982,8 @@ int http_wait_for_request(struct session *s, struct channel *req, int an_bit)
 	 * time.
 	 */
 	if (!(txn->flags & TX_HDR_CONN_PRS) ||
-	    ((s->fe->options & PR_O_HTTP_MODE) != (s->be->options & PR_O_HTTP_MODE))) {
-		int tmp = TX_CON_WANT_KAL;
-
-		if (!((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA)) {
-			if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_TUN ||
-			    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_TUN)
-				tmp = TX_CON_WANT_TUN;
-
-			if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL ||
-			    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL)
-				tmp = TX_CON_WANT_TUN;
-		}
-
-		if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_SCL ||
-		    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_SCL) {
-			/* option httpclose + server_close => forceclose */
-			if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL ||
-			    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_PCL)
-				tmp = TX_CON_WANT_CLO;
-			else
-				tmp = TX_CON_WANT_SCL;
-		}
-
-		if ((s->fe->options & PR_O_HTTP_MODE) == PR_O_HTTP_FCL ||
-		    (s->be->options & PR_O_HTTP_MODE) == PR_O_HTTP_FCL)
-			tmp = TX_CON_WANT_CLO;
-
-		if ((txn->flags & TX_CON_WANT_MSK) < tmp)
-			txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | tmp;
-
-		if (!(txn->flags & TX_HDR_CONN_PRS) &&
-		    (txn->flags & TX_CON_WANT_MSK) != TX_CON_WANT_TUN) {
-			/* parse the Connection header and possibly clean it */
-			int to_del = 0;
-			if ((msg->flags & HTTP_MSGF_VER_11) ||
-			    ((txn->flags & TX_CON_WANT_MSK) >= TX_CON_WANT_SCL &&
-			     !((s->fe->options2|s->be->options2) & PR_O2_FAKE_KA)))
-				to_del |= 2; /* remove "keep-alive" */
-			if (!(msg->flags & HTTP_MSGF_VER_11))
-				to_del |= 1; /* remove "close" */
-			http_parse_connection_header(txn, msg, to_del);
-		}
-
-		/* check if client or config asks for explicit close in KAL/SCL */
-		if (((txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
-		     (txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL) &&
-		    ((txn->flags & TX_HDR_CONN_CLO) ||                         /* "connection: close" */
-		     (!(msg->flags & HTTP_MSGF_VER_11) && !(txn->flags & TX_HDR_CONN_KAL)) || /* no "connection: k-a" in 1.0 */
-		     !(msg->flags & HTTP_MSGF_XFER_LEN) ||                     /* no length known => close */
-		     s->fe->state == PR_STSTOPPED))                            /* frontend is stopping */
-		    txn->flags = (txn->flags & ~TX_CON_WANT_MSK) | TX_CON_WANT_CLO;
-	}
+	    ((s->fe->options & PR_O_HTTP_MODE) != (s->be->options & PR_O_HTTP_MODE)))
+		http_adjust_conn_mode(s, txn, msg);
 
 	/* end of job, return OK */
 	req->analysers &= ~an_bit;
diff --git a/src/proxy.c b/src/proxy.c
index 02103ee11..405c4c4ad 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -955,6 +955,14 @@ int session_set_backend(struct session *s, struct proxy *be)
 		http_init_txn(s);
 	}
 
+	/* If we chain to an HTTP backend running a different HTTP mode, we
+	 * have to re-adjust the desired keep-alive/close mode to accommodate
+	 * both the frontend's and the backend's modes.
+	 */
+	if (s->fe->mode == PR_MODE_HTTP && be->mode == PR_MODE_HTTP &&
+	    ((s->fe->options & PR_O_HTTP_MODE) != (be->options & PR_O_HTTP_MODE)))
+		http_adjust_conn_mode(s, &s->txn, &s->txn.req);
+
 	/* If an LB algorithm needs to access some pre-parsed body contents,
 	 * we must not start to forward anything until the connection is
 	 * confirmed otherwise we'll lose the pointer to these data and