diff --git a/include/proto/h1.h b/include/proto/h1.h
index 8a0e26541..6bd753776 100644
--- a/include/proto/h1.h
+++ b/include/proto/h1.h
@@ -267,5 +267,16 @@ static inline int h1_parse_chunk_size(const struct buffer *buf, int start, int s
 	return -buffer_count(buf, ptr, ptr_stop);
 }
 
+/* initializes an H1 message */
+static inline struct h1m *h1m_init(struct h1m *h1m)
+{
+	h1m->state = HTTP_MSG_RQBEFORE;
+	h1m->flags = 0;
+	h1m->curr_len = 0;
+	h1m->body_len = 0;
+	h1m->err_pos = 0;
+	h1m->err_state = 0;
+	return h1m;
+}
 
 #endif /* _PROTO_H1_H */
diff --git a/include/types/h1.h b/include/types/h1.h
index 8a146c3ca..230102c00 100644
--- a/include/types/h1.h
+++ b/include/types/h1.h
@@ -82,4 +82,20 @@ enum h1_state {
 } __attribute__((packed));
 
 
+/* HTTP/1 message flags (32 bit), for use in h1m->flags only */
+#define H1_MF_NONE              0x00000000
+#define H1_MF_CLEN              0x00000001 // content-length present
+#define H1_MF_CHNK              0x00000002 // chunk present, exclusive with c-l
+
+
+/* basic HTTP/1 message state for use in parsers */
+struct h1m {
+	enum h1_state state;        // H1 message state (HTTP_MSG_*)
+	uint32_t flags;             // H1 message flags (H1_MF_*)
+	uint64_t curr_len;          // content-length or last chunk length
+	uint64_t body_len;          // total known size of the body length
+	int err_pos;                // position in the byte stream of the first error (H1 or H2)
+	int err_state;              // state where the first error was met (H1 or H2)
+};
+
 #endif /* _TYPES_H1_H */