new file mode 100644
--- /dev/null
+++ b/src/http/v3/ngx_http_v3_encode.h
@@ -0,0 +1,34 @@
+
+/*
+ * Copyright (C) Roman Arutyunyan
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#ifndef _NGX_HTTP_V3_ENCODE_H_INCLUDED_
+#define _NGX_HTTP_V3_ENCODE_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+uintptr_t ngx_http_v3_encode_varlen_int(u_char *p, uint64_t value);
+uintptr_t ngx_http_v3_encode_prefix_int(u_char *p, uint64_t value,
+    ngx_uint_t prefix);
+
+uintptr_t ngx_http_v3_encode_header_block_prefix(u_char *p,
+    ngx_uint_t insert_count, ngx_uint_t sign, ngx_uint_t delta_base);
+uintptr_t ngx_http_v3_encode_header_ri(u_char *p, ngx_uint_t dynamic,
+    ngx_uint_t index);
+uintptr_t ngx_http_v3_encode_header_lri(u_char *p, ngx_uint_t dynamic,
+    ngx_uint_t index, u_char *data, size_t len);
+uintptr_t ngx_http_v3_encode_header_l(u_char *p, ngx_str_t *name,
+    ngx_str_t *value);
+uintptr_t ngx_http_v3_encode_header_pbi(u_char *p, ngx_uint_t index);
+uintptr_t ngx_http_v3_encode_header_lpbi(u_char *p, ngx_uint_t index,
+    u_char *data, size_t len);
+
+
+#endif /* _NGX_HTTP_V3_ENCODE_H_INCLUDED_ */