diff --git a/contrib/spoa_server/spoa.h b/contrib/spoa_server/spoa.h
new file mode 100644
index 0000000..81f5816
--- /dev/null
+++ b/contrib/spoa_server/spoa.h
@@ -0,0 +1,81 @@
+/* Main SPOA server includes
+ *
+ * Copyright 2016 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
+ * Copyright 2018 OZON / Thierry Fournier <thierry.fournier@ozon.io>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef __SPOA_H__
+#define __SPOA_H__
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <netinet/in.h>
+
+#define MAX_FRAME_SIZE    16384
+#define SPOP_VERSION      "1.0"
+#define SPOA_CAPABILITIES ""
+
+/* All supported data types */
+enum spoe_data_type {
+	SPOE_DATA_T_NULL = 0,
+	SPOE_DATA_T_BOOL,
+	SPOE_DATA_T_INT32,
+	SPOE_DATA_T_UINT32,
+	SPOE_DATA_T_INT64,
+	SPOE_DATA_T_UINT64,
+	SPOE_DATA_T_IPV4,
+	SPOE_DATA_T_IPV6,
+	SPOE_DATA_T_STR,
+	SPOE_DATA_T_BIN,
+	SPOE_DATA_TYPES
+};
+
+/* Scopes used for variables set by agents. It is a way to be agnotic to vars
+ * scope. */
+enum spoe_vars_scope {
+	SPOE_SCOPE_PROC = 0, /* <=> SCOPE_PROC  */
+	SPOE_SCOPE_SESS,     /* <=> SCOPE_SESS */
+	SPOE_SCOPE_TXN,      /* <=> SCOPE_TXN  */
+	SPOE_SCOPE_REQ,      /* <=> SCOPE_REQ  */
+	SPOE_SCOPE_RES,      /* <=> SCOPE_RES  */
+};
+
+struct worker {
+	unsigned int id;
+	char         buf[MAX_FRAME_SIZE];
+	unsigned int len;
+	unsigned int size;
+	int          status_code;
+	unsigned int stream_id;
+	unsigned int frame_id;
+	bool         healthcheck;
+	int          ip_score; /* -1 if unset, else between 0 and 100 */
+};
+
+struct chunk {
+	char *str;	/* beginning of the string itself. Might not be 0-terminated */
+	int len;	/* current size of the string from first to last char */
+};
+
+union spoe_value {
+	bool            boolean; /* use for boolean */
+	int32_t         sint32;  /* used for signed 32bits integers */
+	uint32_t        uint32;  /* used for signed 32bits integers */
+	int32_t         sint64;  /* used for signed 64bits integers */
+	uint32_t        uint64;  /* used for signed 64bits integers */
+	struct in_addr  ipv4;    /* used for ipv4 addresses */
+	struct in6_addr ipv6;    /* used for ipv6 addresses */
+	struct chunk    buffer;  /* used for char strings or buffers */
+};
+
+/* Used to store sample constant */
+struct spoe_data {
+	enum spoe_data_type type;  /* SPOE_DATA_T_* */
+	union spoe_value    u;     /* spoe data value */
+};
+
+#endif /* __SPOA_H__ */