diff --git a/demos/src/url_parser.c b/demos/src/url_parser.c
deleted file mode 100644
index d581d79c..00000000
--- a/demos/src/url_parser.c
+++ /dev/null
@@ -1,416 +0,0 @@
-/*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
- *
- *  Licensed under the Apache License, Version 2.0 (the License); you may
- *  not use this file except in compliance with the License.
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- */
-
-
-#include "url_parser.h"
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-
-static const char *_strnstr(const char *s, size_t s_len, const char *needle)
-{
-	const char *end = s + s_len;
-	size_t needle_len = strlen(needle);
-	const char *p;
-
-	p = s;
-	while (p < end - needle_len + 1) {
-		if (strncmp(p, needle, needle_len) == 0) {
-			return p;
-		}
-		p++;
-	}
-
-	return NULL;
-}
-
-static const char *find_chars(const char *s, size_t s_len, const char *chars)
-{
-	const char *end = s + s_len;
-	size_t chars_n = strlen(chars);
-	const char *p;
-	int i;
-
-	p = s;
-	while (p < end) {
-		for (i = 0 ; i < chars_n ; i++) {
-			if (*p == chars[i]) {
-				return p;
-			}
-		}
-		p++;
-	}
-
-	return NULL;
-}
-
-static const char *find_chars_reverse(const char *s, size_t s_len, const char *chars)
-{
-	const char *end = s + s_len;
-	size_t chars_n = strlen(chars);
-	const char *p;
-	int i;
-
-	p = end - 1;
-	while (p >= s) {
-		for (i = 0 ; i < chars_n ; i++) {
-			if (*p == chars[i]) {
-				return p;
-			}
-		}
-		p--;
-	}
-
-	return NULL;
-}
-
-static int is_alpha(char c)
-{
-	if ((c >= 'a' && c <= 'z') ||
-	    (c >= 'A' && c <= 'Z')) {
-		return 1;
-	}
-	return 0;
-}
-
-static int is_digit(char c)
-{
-	if (c >= '0' && c <= '9') {
-		return 1;
-	}
-	return 0;
-}
-
-static int is_control(char c)
-{
-	if ((c >= 0x00 && c <= 0x1f) ||
-	    c == 0x7f) {
-		return 1;
-	}
-	return 0;
-}
-
-static const char *lookup_scheme(const char *s)
-{
-	const char *p = s;
-	char c;
-
-	if (strlen(s) == 0) {
-		return NULL;
-	}
-
-	if (!is_alpha(*p)) {
-		return NULL;
-	}
-	p++;
-
-	while (*p != '\0') {
-		c = *p;
-		if (c == ':') {
-			return p;
-		}
-		if (!is_alpha(c) &&
-		    !is_digit(c) &&
-		    c != '+' &&
-		    c != '-' &&
-		    c != '.') {
-			return NULL;
-		}
-		p++;
-	}
-	return NULL;
-}
-
-static int parse_user_password(const char *s, size_t s_len, URL_COMPONENTS *c)
-{
-	const char *end = s + s_len;
-	const char *found;
-
-	found = _strnstr(s, s_len, ":");
-	if (found) {
-		c->user = strndup(s, found - s);
-		if (c->user == NULL) {
-			return -1;	/* ENOMEM */
-		}
-		c->password = strndup(found + 1, end - found - 1);
-		if (c->password == NULL) {
-			return -1;	/* ENOMEM */
-		}
-	} else {
-		c->user = strndup(s, s_len);
-		if (c->user == NULL) {
-			return -1;	/* ENOMEM */
-		}
-	}
-
-	return 0;
-}
-
-static int parse_authority(const char *s, size_t s_len, URL_COMPONENTS *c)
-{
-	const char *end = s + s_len;
-	const char *p, *found, *host_start, *host_end;
-	int port;
-
-	c->port = -1;
-
-	if (s_len == 0) {	/* empty authority */
-		return 0;
-	}
-
-	found = _strnstr(s, s_len, "@");
-	if (found) {
-		if (parse_user_password(s, found - s, c) == -1) {
-			return -1;
-		}
-
-		host_start = found + 1;
-	} else {
-		host_start = s;
-	}
-
-	if (*host_start == '[') {
-		/* IP-literal host */
-		if (find_chars(host_start + 1, end - host_start - 1, "[")) {
-			errno = EINVAL;
-			return -1;
-		}
-		host_end = find_chars(host_start + 1, end - host_start - 1, "]");
-		if (!host_end) {
-			errno = EINVAL;
-			return -1;
-		}
-		/* The next character of ']' is termination or ':'. */
-		if (host_end + 1 != end && host_end[1] != ':') {
-			errno = EINVAL;
-			return -1;
-		}
-		host_end++;
-	} else {
-		/* IPv4address / reg-name host */
-		host_end = find_chars_reverse(host_start, end - host_start, ":");
-		if (host_end == NULL) {
-			host_end = end;
-		}
-		if (find_chars(host_start, host_end - host_start, "[]")) {
-			errno = EINVAL;
-			return -1;
-		}
-	}
-	if (find_chars(host_start, host_end - host_start, " ")) {
-		errno = EINVAL;
-		return -1;
-	}
-
-	/* ASSERT: host_end == end or *host_end == ':' */
-
-	if (host_end == end) {
-		/* without port number */
-		if (host_start == end) {	/* empty host */
-			errno = EINVAL;
-			return -1;
-		}
-		c->host = strndup(host_start, end - host_start);
-		if (c->host == NULL) {
-			return -1;	/* ENOMEM */
-		}
-		return 0;
-	}
-
-	/* ASSERT: *host_end == ':' */
-
-	/* host and port */
-
-	if (host_start == host_end) {	/* empty host */
-		errno = EINVAL;
-		return -1;
-	}
-
-	if (host_end + 1 < end) {
-		p = host_end + 1;
-		port = 0;
-		while (p < end) {
-			if (*p < '0' || *p > '9') {
-				errno = EINVAL;
-				return -1;
-			}
-
-			port = port * 10 + *p - '0';
-			if (port > 65535) {
-				errno = EINVAL;
-				return -1;
-			}
-
-			p++;
-		}
-	} else {
-		/* empty port number */
-		port = -1;
-	}
-
-	c->host = strndup(host_start, (size_t) (host_end - host_start));
-	if (c->host == NULL) {
-		return -1;	/* ENOMEM */
-	}
-	c->port = port;
-
-	return 0;
-}
-
-URL_COMPONENTS *parse_url(const char *url)
-{
-	URL_COMPONENTS *c;
-	const char *p;
-	const char *end = url + strlen(url);
-	const char *found;
-	size_t len;
-
-	for (p = url ; p < end ; p++) {
-		if (is_control(*p)) {
-			errno = EINVAL;
-			return NULL;
-		}
-	}
-
-	c = malloc(sizeof(URL_COMPONENTS));
-	if (!c) {
-		return NULL;
-	}
-	memset(c, 0, sizeof(URL_COMPONENTS));
-	c->port = -1;
-
-	p = url;
-
-	/* lookup scheme */
-	found = lookup_scheme(p);
-	if (found) {
-		c->scheme = strndup(url, (size_t) (found - p));
-		if (c->scheme == NULL) {
-			goto error;
-		}
-		p = found + 1;	/* skip a colon */
-		if (p >= end) {
-			return c;
-		}
-	}
-
-	if (strlen(p) >= 2 &&
-	    p[0] == '/' && p[1] == '/') {
-		/* authority */
-		p = p + 2;
-		found = find_chars(p, strlen(p), "/?#");
-		if (found == NULL) {
-			len = strlen(p);
-		} else {
-			len = (size_t) (found - p);
-		}
-		if (parse_authority(p, len, c) == -1) {
-			goto error;	/* ENOMEM,EINVAL */
-		}
-
-		if (!found) {
-			return c;
-		}
-
-		p = found;
-	}
-
-	if (*p != '?' && *p != '#') {
-		/* path */
-		found = find_chars(p, strlen(p), "?#");
-		found = NULL;
-		if (found == NULL) {
-			c->path = strdup(p);
-			if (c->path == NULL) {
-				goto error;
-			}
-		} else 
-		{
-			if (found != p) {
-				c->path = strndup(p,  (size_t) (found - p));
-				if (c->path == NULL) {
-					goto error;
-				}
-			}
-		}
-
-		if (!found) {
-			return c;
-		}
-
-		p = found;
-	}
-
-	/* ASSERT: *p is '?' or '#' */
-#if 0
-	if (*p == '?') {
-		/* query */
-		p = p + 1;
-		found = find_chars(p, strlen(p), "#");
-		if (found == NULL) {
-			c->query = strdup(p);
-		} else {
-			c->query = strndup(p,  (size_t) (found - p));
-		}
-
-		if (c->query == NULL) {
-			goto error;
-		}
-
-		if (!found) {
-			return c;
-		}
-
-		p = found;
-	}
-#endif
-
-	/* ASSERT: *p is '#' */
-
-	/* fragment */
-	p = p + 1;
-	c->fragment = strdup(p);
-	if (c->fragment == NULL) {
-		goto error;
-	}
-
-	return c;
-
-error:
-	free(c);
-
-	return NULL;
-}
-
-void free_url_components(URL_COMPONENTS *c)
-{
-	if (c->scheme) {
-		free(c->scheme);
-	}
-	if (c->user) {
-		free(c->user);
-	}
-	if (c->password) {
-		free(c->password);
-	}
-	if (c->host) {
-		free(c->host);
-	}
-	if (c->path) {
-		free(c->path);
-	}
-	if (c->query) {
-		free(c->query);
-	}
-	if (c->fragment) {
-		free(c->fragment);
-	}
-	free(c);
-}
-
diff --git a/demos/src/url_parser.h b/demos/src/url_parser.h
deleted file mode 100644
index 5faba44c..00000000
--- a/demos/src/url_parser.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
- *
- *  Licensed under the Apache License, Version 2.0 (the License); you may
- *  not use this file except in compliance with the License.
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- */
-
-
-#ifndef URL_PARSER_H
-#define URL_PARSER_H
-
-#define URL_PARSER_VERSION  0x00000300	/* 0.0.3 */
-
-typedef struct url_components {
-	char *scheme;
-	char *user;
-	char *password;
-	char *host;
-	int  port;
-	char *path;
-	char *query;
-	char *fragment;
-} URL_COMPONENTS;
-
-extern URL_COMPONENTS *parse_url(const char *url);
-extern void free_url_components(URL_COMPONENTS *c);
-
-#endif