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diff --git a/lib/isc/picohttpparser.h b/lib/isc/picohttpparser.h
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+/*
+ * Copyright (c) 2009-2014 Kazuho Oku, Tokuhiro Matsuno, Daisuke Murase,
+ *                         Shigeo Mitsunari
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * The software is licensed under either the MIT License (below) or the Perl
+ * license.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef picohttpparser_h
+#define picohttpparser_h
+
+#include <sys/types.h>
+
+#ifdef _MSC_VER
+#define ssize_t intptr_t
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* contains name and value of a header (name == NULL if is a continuing line
+ * of a multiline header */
+struct phr_header {
+	const char *name;
+	size_t name_len;
+	const char *value;
+	size_t value_len;
+};
+
+/* returns number of bytes consumed if successful, -2 if request is partial,
+ * -1 if failed */
+int
+phr_parse_request(const char *buf, size_t len, const char **method,
+		  size_t *method_len, const char **path, size_t *path_len,
+		  int *minor_version, struct phr_header *headers,
+		  size_t *num_headers, size_t last_len);
+
+/* ditto */
+int
+phr_parse_response(const char *_buf, size_t len, int *minor_version,
+		   int *status, const char **msg, size_t *msg_len,
+		   struct phr_header *headers, size_t *num_headers,
+		   size_t last_len);
+
+/* ditto */
+int
+phr_parse_headers(const char *buf, size_t len, struct phr_header *headers,
+		  size_t *num_headers, size_t last_len);
+
+/* should be zero-filled before start */
+struct phr_chunked_decoder {
+	size_t bytes_left_in_chunk; /* number of bytes left in current chunk */
+	char consume_trailer;	    /* if trailing headers should be consumed */
+	char _hex_count;
+	char _state;
+};
+
+/* the function rewrites the buffer given as (buf, bufsz) removing the chunked-
+ * encoding headers.  When the function returns without an error, bufsz is
+ * updated to the length of the decoded data available.  Applications should
+ * repeatedly call the function while it returns -2 (incomplete) every time
+ * supplying newly arrived data.  If the end of the chunked-encoded data is
+ * found, the function returns a non-negative number indicating the number of
+ * octets left undecoded, that starts from the offset returned by `*bufsz`.
+ * Returns -1 on error.
+ */
+ssize_t
+phr_decode_chunked(struct phr_chunked_decoder *decoder, char *buf,
+		   size_t *bufsz);
+
+/* returns if the chunked decoder is in middle of chunked data */
+int
+phr_decode_chunked_is_in_data(struct phr_chunked_decoder *decoder);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif