diff --git a/include/proto/stream_interface.h b/include/proto/stream_interface.h
index a6f6d33e0..7f543242d 100644
--- a/include/proto/stream_interface.h
+++ b/include/proto/stream_interface.h
@@ -236,6 +236,46 @@ static inline void si_applet_release(struct stream_interface *si)
 		appctx->applet->release(appctx);
 }
 
+/* let an applet indicate that it wants to put some data into the input buffer */
+static inline void si_applet_want_put(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_PUT;
+}
+
+/* let an applet indicate that it wanted to put some data into the input buffer
+ * but it couldn't.
+ */
+static inline void si_applet_cant_put(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_PUT | SI_FL_WAIT_ROOM;
+}
+
+/* let an applet indicate that it doesn't want to put data into the input buffer */
+static inline void si_applet_stop_put(struct stream_interface *si)
+{
+	si->flags &= ~SI_FL_WANT_PUT;
+}
+
+/* let an applet indicate that it wants to get some data from the output buffer */
+static inline void si_applet_want_get(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_GET;
+}
+
+/* let an applet indicate that it wanted to get some data from the output buffer
+ * but it couldn't.
+ */
+static inline void si_applet_cant_get(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_GET | SI_FL_WAIT_DATA;
+}
+
+/* let an applet indicate that it doesn't want to get data from the input buffer */
+static inline void si_applet_stop_get(struct stream_interface *si)
+{
+	si->flags &= ~SI_FL_WANT_GET;
+}
+
 /* Try to allocate a new connection and assign it to the interface. If
  * a connection was previously allocated and the <reuse> flag is set,
  * it is returned unmodified. Otherwise it is reset.
diff --git a/include/types/stream_interface.h b/include/types/stream_interface.h
index 9b228e57c..51bb4d61a 100644
--- a/include/types/stream_interface.h
+++ b/include/types/stream_interface.h
@@ -72,6 +72,8 @@ enum {
 	SI_FL_NOLINGER   = 0x0080,  /* may close without lingering. One-shot. */
 	SI_FL_NOHALF     = 0x0100,  /* no half close, close both sides at once */
 	SI_FL_SRC_ADDR   = 0x1000,  /* get the source ip/port with getsockname */
+	SI_FL_WANT_PUT   = 0x2000,  /* an applet would like to put some data into the buffer */
+	SI_FL_WANT_GET   = 0x4000,  /* an applet would like to get some data from the buffer */
 };
 
 /* A stream interface has 3 parts :