samples/net/http_server/src/main.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2017 Intel Corporation
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #if 1
 #if defined(CONFIG_HTTPS)
 #define SYS_LOG_DOMAIN "https-server"
 #else
 #define SYS_LOG_DOMAIN "http-server"
 #endif
 #define NET_SYS_LOG_LEVEL SYS_LOG_LEVEL_DEBUG
 #define NET_LOG_ENABLED 1
 #endif

 #include <zephyr.h>
 #include <stdio.h>

 #include <net/net_context.h>

 #include <net/http.h>

 #include "config.h"

 /* Sets the network parameters */

 #if defined(CONFIG_NET_CONTEXT_NET_PKT_POOL)
 NET_PKT_TX_SLAB_DEFINE(http_srv_tx, 15);
 NET_PKT_DATA_POOL_DEFINE(http_srv_data, 30);

 static struct k_mem_slab *tx_slab(void)
 {
 	return &http_srv_tx;
 }

 static struct net_buf_pool *data_pool(void)
 {
 	return &http_srv_data;
 }
 #else
 #if defined(CONFIG_NET_L2_BT)
 #error "TCP connections over Bluetooth need CONFIG_NET_CONTEXT_NET_PKT_POOL "\
 	"defined."
 #endif /* CONFIG_NET_L2_BT */

 #define tx_slab NULL
 #define data_pool NULL
 #endif /* CONFIG_NET_CONTEXT_NET_PKT_POOL */

 #define RESULT_BUF_SIZE 1500
 static u8_t http_result[RESULT_BUF_SIZE];

 #if defined(CONFIG_HTTPS)
 #if !defined(CONFIG_HTTPS_STACK_SIZE)
 #define CONFIG_HTTPS_STACK_SIZE		8192
 #endif /* CONFIG_HTTPS_STACK_SIZE */

 #define APP_BANNER "Run HTTPS server"
 #define INSTANCE_INFO "Zephyr HTTPS example server #1"

 /* Note that each HTTPS context needs its own stack as there will be
  * a separate thread for each HTTPS context.
  */
 NET_STACK_DEFINE(HTTPS, https_stack, CONFIG_NET_APP_TLS_STACK_SIZE,
 		 CONFIG_NET_APP_TLS_STACK_SIZE);

 #define RX_FIFO_DEPTH 4
 K_MEM_POOL_DEFINE(ssl_rx_pool, 4, 64, RX_FIFO_DEPTH, 4);

 #else /* CONFIG_HTTPS */
 #define APP_BANNER "Run HTTP server"
 #endif /* CONFIG_HTTPS */

 /*
  * Note that the http_server_ctx and http_server_urls are quite large so be
  * careful if those are allocated from stack.
  */
 static struct http_ctx http_ctx;
 static struct http_server_urls http_urls;

 void panic(const char *msg)
 {
 	if (msg) {
 		NET_ERR("%s", msg);
 	}

 	for (;;) {
 		k_sleep(K_FOREVER);
 	}
 }

 #define HTTP_STATUS_200_OK	"HTTP/1.1 200 OK\r\n" \
 				"Content-Type: text/html\r\n" \
 				"Transfer-Encoding: chunked\r\n"

 #define HTTP_STATUS_200_OK_GZ	"HTTP/1.1 200 OK\r\n" \
 				"Content-Type: text/html\r\n" \
 				"Transfer-Encoding: chunked\r\n" \
 				"Content-Encoding: gzip\r\n"

 #define HTML_HEADER		"<html><head>" \
 				"<title>Zephyr HTTP Server</title>" \
 				"</head><body><h1>" \
 				"<center>Zephyr HTTP server</center></h1>\r\n"

 #define HTML_FOOTER		"</body></html>\r\n"

 static int http_response(struct http_ctx *ctx, const char *header,
 			 const char *payload, size_t payload_len,
 			 char *str)
 {
 	int ret;

 	ret = http_add_header(ctx, header, str);
 	if (ret < 0) {
 		NET_ERR("Cannot add HTTP header (%d)", ret);
 		return ret;
 	}

 	ret = http_add_header(ctx, HTTP_CRLF, str);
 	if (ret < 0) {
 		return ret;
 	}

 	ret = http_send_chunk(ctx, payload, payload_len, str);
 	if (ret < 0) {
 		NET_ERR("Cannot send data to peer (%d)", ret);
 		return ret;
 	}

 	return http_send_flush(ctx, str);
 }

 static int http_response_soft_404(struct http_ctx *ctx)
 {
 	static const char *not_found =
 		HTML_HEADER
 		"<h2><center>404 Not Found</center></h2>"
 		HTML_FOOTER;

 	return http_response(ctx, HTTP_STATUS_200_OK, not_found,
 			     strlen(not_found), "Error");
 }

 /* Prints the received HTTP header fields as an HTML list */
 static void print_http_headers(struct http_ctx *ctx,
 			       char *str, int size)
 {
 	int offset;
 	int ret;

 	ret = snprintf(str, size,
 		       HTML_HEADER
 		       "<h2>HTTP Header Fields</h2>\r\n<ul>\r\n");
 	if (ret < 0 || ret >= size) {
 		return;
 	}

 	offset = ret;

 	for (u8_t i = 0; i < ctx->http.field_values_ctr; i++) {
 		struct http_field_value *kv = &ctx->http.field_values[i];

 		ret = snprintf(str + offset, size - offset,
 			       "<li>%.*s: %.*s</li>\r\n",
 			       kv->key_len, kv->key,
 			       kv->value_len, kv->value);
 		if (ret < 0 || ret >= size) {
 			return;
 		}

 		offset += ret;
 	}

 	ret = snprintf(str + offset, size - offset, "</ul>\r\n");
 	if (ret < 0 || ret >= size) {
 		return;
 	}

 	offset += ret;

 	ret = snprintf(str + offset, size - offset,
 		       "<h2>HTTP Method: %s</h2>\r\n",
 		       http_method_str(ctx->http.parser.method));
 	if (ret < 0 || ret >= size) {
 		return;
 	}

 	offset += ret;

 	ret = snprintf(str + offset, size - offset,
 		       "<h2>URL: %.*s</h2>\r\n",
 		       ctx->http.url_len, ctx->http.url);
 	if (ret < 0 || ret >= size) {
 		return;
 	}

 	offset += ret;

 	snprintf(str + offset, size - offset,
 		 "<h2>Server: %s</h2>"HTML_FOOTER, CONFIG_ARCH);
 }

 int http_serve_headers(struct http_ctx *ctx)
 {
 #define HTTP_MAX_BODY_STR_SIZE		1024
 	static char html_body[HTTP_MAX_BODY_STR_SIZE];

 	print_http_headers(ctx, html_body, HTTP_MAX_BODY_STR_SIZE);

 	return http_response(ctx, HTTP_STATUS_200_OK, html_body,
 			     strlen(html_body), "Headers");
 }

 static int http_serve_index_html(struct http_ctx *ctx)
 {
 	static const char index_html[] = {
 #include "index.html.inc"
 	};

 	NET_DBG("Sending index.html (%zd bytes) to client",
 		sizeof(index_html));

 	return http_response(ctx, HTTP_STATUS_200_OK, index_html,
 			     sizeof(index_html), "Index");
 }

 static void http_connected(struct http_ctx *ctx,
 			   enum http_connection_type type,
 			   void *user_data)
 {
 	char url[32];
 	int len = min(sizeof(url) - 1, ctx->http.url_len);

 	memcpy(url, ctx->http.url, len);
 	url[len] = '\0';

 	NET_DBG("%s connect attempt URL %s",
 		type == HTTP_CONNECTION ? "HTTP" : "WS", url);

 	if (type == HTTP_CONNECTION) {
 		if (strncmp(ctx->http.url, "/",
 			    ctx->http.url_len) == 0) {
 			http_serve_index_html(ctx);
 			http_close(ctx);
 			return;
 		}

 		if (strncmp(ctx->http.url, "/index.html",
 			    ctx->http.url_len) == 0) {
 			http_serve_index_html(ctx);
 			http_close(ctx);
 			return;
 		}

 		if (strncmp(ctx->http.url, "/headers",
 			    ctx->http.url_len) == 0) {
 			http_serve_headers(ctx);
 			http_close(ctx);
 			return;
 		}
 	}

 	/* Give 404 error for all the other URLs we do not want to handle
 	 * right now.
 	 */
 	http_response_soft_404(ctx);
 	http_close(ctx);
 }

 static void http_received(struct http_ctx *ctx,
 			  struct net_pkt *pkt,
 			  int status,
 			  u32_t flags,
 			  void *user_data)
 {
 	if (!status) {
 		if (pkt) {
 			NET_DBG("Received %d bytes data",
 				net_pkt_appdatalen(pkt));
 			net_pkt_unref(pkt);
 		}
 	} else {
 		NET_ERR("Receive error (%d)", status);

 		if (pkt) {
 			net_pkt_unref(pkt);
 		}
 	}
 }

 static void http_sent(struct http_ctx *ctx,
 		      int status,
 		      void *user_data_send,
 		      void *user_data)
 {
 	NET_DBG("%s sent", (char *)user_data_send);
 }

 static void http_closed(struct http_ctx *ctx,
 			int status,
 			void *user_data)
 {
 	NET_DBG("Connection %p closed", ctx);
 }

 static const char *get_string(int str_len, const char *str)
 {
 	static char buf[64];
 	int len = min(str_len, sizeof(buf) - 1);

 	memcpy(buf, str, len);
 	buf[len] = '\0';

 	return buf;
 }

 static enum http_verdict default_handler(struct http_ctx *ctx,
 					 enum http_connection_type type)
 {
 	NET_DBG("No handler for %s URL %s",
 		type == HTTP_CONNECTION ? "HTTP" : "WS",
 		get_string(ctx->http.url_len, ctx->http.url));

 	if (type == HTTP_CONNECTION) {
 		http_response_soft_404(ctx);
 	}

 	return HTTP_VERDICT_DROP;
 }


 #if defined(CONFIG_HTTPS)
 /* Load the certificates and private RSA key. */

 static const char echo_apps_cert_der[] = {
 #include "echo-apps-cert.der.inc"
 };

 static const char echo_apps_key_der[] = {
 #include "echo-apps-key.der.inc"
 };

 static int setup_cert(struct net_app_ctx *app_ctx,
 		      mbedtls_x509_crt *cert,
 		      mbedtls_pk_context *pkey)
 {
 	int ret;

 	ret = mbedtls_x509_crt_parse(cert, echo_apps_cert_der,
 				     sizeof(echo_apps_cert_der));
 	if (ret != 0) {
 		NET_ERR("mbedtls_x509_crt_parse returned %d", ret);
 		return ret;
 	}

 	ret = mbedtls_pk_parse_key(pkey, echo_apps_key_der,
 				   sizeof(echo_apps_key_der),
 				   NULL, 0);
 	if (ret != 0) {
 		NET_ERR("mbedtls_pk_parse_key returned %d", ret);
 		return ret;
 	}

 	return 0;
 }
 #endif /* CONFIG_HTTPS */

 void main(void)
 {
 	struct sockaddr addr, *server_addr;
 	int ret;

 	/*
 	 * There are several options here for binding to local address.
 	 * 1) The server address can be left empty in which case the
 	 *    library will bind to both IPv4 and IPv6 addresses and to
 	 *    port 80 which is the default.
 	 * 2) The server address can be partially filled, meaning that
 	 *    the address can be left to 0 and port can be set if a value
 	 *    other than 80 is desired. If the protocol family in sockaddr
 	 *    is set to AF_UNSPEC, then both IPv4 and IPv6 socket is bound.
 	 * 3) The address can be set to some real value. There is a helper
 	 *    function that can be used to fill the socket address struct.
 	 */
 #define ADDR_OPTION 1

 #if ADDR_OPTION == 1
 	server_addr = NULL;

 	ARG_UNUSED(addr);

 #elif ADDR_OPTION == 2
 	/* Accept any local listening address */
 	memset(&addr, 0, sizeof(addr));

 	net_sin(&addr)->sin_port = htons(ZEPHYR_PORT);

 	/* In this example, listen only IPv4 */
 	addr.family = AF_INET;

 	server_addr = &addr;

 #elif ADDR_OPTION == 3
 	/* Set the bind address according to your configuration */
 	memset(&addr, 0, sizeof(addr));

 	/* In this example, listen only IPv6 */
 	addr.family = AF_INET6;

 	ret = http_server_set_local_addr(&addr, ZEPHYR_ADDR, ZEPHYR_PORT);
 	if (ret < 0) {
 		NET_ERR("Cannot set local address (%d)", ret);
 		panic(NULL);
 	}

 	server_addr = &addr;

 #else
 	server_addr = NULL;

 	ARG_UNUSED(addr);
 #endif

 	http_server_add_default(&http_urls, default_handler);
 	http_server_add_url(&http_urls, "/headers", HTTP_URL_STANDARD);
 	http_server_add_url(&http_urls, "/index.html", HTTP_URL_STANDARD);
 	http_server_add_url(&http_urls, "/", HTTP_URL_STANDARD);

 	ret = http_server_init(&http_ctx, &http_urls, server_addr, http_result,
 			       sizeof(http_result), "Zephyr HTTP Server",
 			       NULL);
 	if (ret < 0) {
 		NET_ERR("Cannot initialize HTTP server (%d)", ret);
 		panic(NULL);
 	}

 #if defined(CONFIG_NET_CONTEXT_NET_PKT_POOL)
 	net_app_set_net_pkt_pool(&http_ctx.app_ctx, tx_slab, data_pool);
 #endif

 	http_set_cb(&http_ctx, http_connected, http_received,
 		    http_sent, http_closed);

 #if defined(CONFIG_HTTPS)
 	ret = http_server_set_tls(&http_ctx,
 				  APP_BANNER,
 				  INSTANCE_INFO,
 				  strlen(INSTANCE_INFO),
 				  setup_cert,
 				  NULL,
 				  &ssl_rx_pool,
 				  https_stack,
 				  K_THREAD_STACK_SIZEOF(https_stack));
 	if (ret < 0) {
 		NET_ERR("Cannot enable TLS support (%d)", ret);
 	}
 #endif

 	/*
 	 * If needed, the HTTP parser callbacks can be set according to
 	 * applications own needs before enabling the server. In this example
 	 * we use the default callbacks defined in HTTP server API.
 	 */

 	http_server_enable(&http_ctx);
 }
	/*
	* Copyright (c) 2017 Intel Corporation
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#if 1
	#if defined(CONFIG_HTTPS)
	#define SYS_LOG_DOMAIN "https-server"
	#else
	#define SYS_LOG_DOMAIN "http-server"
	#endif
	#define NET_SYS_LOG_LEVEL SYS_LOG_LEVEL_DEBUG
	#define NET_LOG_ENABLED 1
	#endif

	#include <zephyr.h>
	#include <stdio.h>

	#include <net/net_context.h>

	#include <net/http.h>

	#include "config.h"

	/* Sets the network parameters */

	#if defined(CONFIG_NET_CONTEXT_NET_PKT_POOL)
	NET_PKT_TX_SLAB_DEFINE(http_srv_tx, 15);
	NET_PKT_DATA_POOL_DEFINE(http_srv_data, 30);

	static struct k_mem_slab *tx_slab(void)
	{
	return &http_srv_tx;
	}

	static struct net_buf_pool *data_pool(void)
	{
	return &http_srv_data;
	}
	#else
	#if defined(CONFIG_NET_L2_BT)
	#error "TCP connections over Bluetooth need CONFIG_NET_CONTEXT_NET_PKT_POOL "\
	"defined."
	#endif /* CONFIG_NET_L2_BT */

	#define tx_slab NULL
	#define data_pool NULL
	#endif /* CONFIG_NET_CONTEXT_NET_PKT_POOL */

	#define RESULT_BUF_SIZE 1500
	static u8_t http_result[RESULT_BUF_SIZE];

	#if defined(CONFIG_HTTPS)
	#if !defined(CONFIG_HTTPS_STACK_SIZE)
	#define CONFIG_HTTPS_STACK_SIZE 8192
	#endif /* CONFIG_HTTPS_STACK_SIZE */

	#define APP_BANNER "Run HTTPS server"
	#define INSTANCE_INFO "Zephyr HTTPS example server #1"

	/* Note that each HTTPS context needs its own stack as there will be
	* a separate thread for each HTTPS context.
	*/
	NET_STACK_DEFINE(HTTPS, https_stack, CONFIG_NET_APP_TLS_STACK_SIZE,
	CONFIG_NET_APP_TLS_STACK_SIZE);

	#define RX_FIFO_DEPTH 4
	K_MEM_POOL_DEFINE(ssl_rx_pool, 4, 64, RX_FIFO_DEPTH, 4);

	#else /* CONFIG_HTTPS */
	#define APP_BANNER "Run HTTP server"
	#endif /* CONFIG_HTTPS */

	/*
	* Note that the http_server_ctx and http_server_urls are quite large so be
	* careful if those are allocated from stack.
	*/
	static struct http_ctx http_ctx;
	static struct http_server_urls http_urls;

	void panic(const char *msg)
	{
	if (msg) {
	NET_ERR("%s", msg);
	}

	for (;;) {
	k_sleep(K_FOREVER);
	}
	}

	#define HTTP_STATUS_200_OK "HTTP/1.1 200 OK\r\n" \
	"Content-Type: text/html\r\n" \
	"Transfer-Encoding: chunked\r\n"

	#define HTTP_STATUS_200_OK_GZ "HTTP/1.1 200 OK\r\n" \
	"Content-Type: text/html\r\n" \
	"Transfer-Encoding: chunked\r\n" \
	"Content-Encoding: gzip\r\n"

	#define HTML_HEADER "<html><head>" \
	"<title>Zephyr HTTP Server</title>" \
	"</head><body><h1>" \
	"<center>Zephyr HTTP server</center></h1>\r\n"

	#define HTML_FOOTER "</body></html>\r\n"

	static int http_response(struct http_ctx ctx, const char header,
	const char *payload, size_t payload_len,
	char *str)
	{
	int ret;

	ret = http_add_header(ctx, header, str);
	if (ret < 0) {
	NET_ERR("Cannot add HTTP header (%d)", ret);
	return ret;
	}

	ret = http_add_header(ctx, HTTP_CRLF, str);
	if (ret < 0) {
	return ret;
	}

	ret = http_send_chunk(ctx, payload, payload_len, str);
	if (ret < 0) {
	NET_ERR("Cannot send data to peer (%d)", ret);
	return ret;
	}

	return http_send_flush(ctx, str);
	}

	static int http_response_soft_404(struct http_ctx *ctx)
	{
	static const char *not_found =
	HTML_HEADER
	"<h2><center>404 Not Found</center></h2>"
	HTML_FOOTER;

	return http_response(ctx, HTTP_STATUS_200_OK, not_found,
	strlen(not_found), "Error");
	}

	/* Prints the received HTTP header fields as an HTML list */
	static void print_http_headers(struct http_ctx *ctx,
	char *str, int size)
	{
	int offset;
	int ret;

	ret = snprintf(str, size,
	HTML_HEADER
	"<h2>HTTP Header Fields</h2>\r\n<ul>\r\n");
	if (ret < 0 \|\| ret >= size) {
	return;
	}

	offset = ret;

	for (u8_t i = 0; i < ctx->http.field_values_ctr; i++) {
	struct http_field_value *kv = &ctx->http.field_values[i];

	ret = snprintf(str + offset, size - offset,
	"<li>%.s: %.s</li>\r\n",
	kv->key_len, kv->key,
	kv->value_len, kv->value);
	if (ret < 0 \|\| ret >= size) {
	return;
	}

	offset += ret;
	}

	ret = snprintf(str + offset, size - offset, "</ul>\r\n");
	if (ret < 0 \|\| ret >= size) {
	return;
	}

	offset += ret;

	ret = snprintf(str + offset, size - offset,
	"<h2>HTTP Method: %s</h2>\r\n",
	http_method_str(ctx->http.parser.method));
	if (ret < 0 \|\| ret >= size) {
	return;
	}

	offset += ret;

	ret = snprintf(str + offset, size - offset,
	"<h2>URL: %.*s</h2>\r\n",
	ctx->http.url_len, ctx->http.url);
	if (ret < 0 \|\| ret >= size) {
	return;
	}

	offset += ret;

	snprintf(str + offset, size - offset,
	"<h2>Server: %s</h2>"HTML_FOOTER, CONFIG_ARCH);
	}

	int http_serve_headers(struct http_ctx *ctx)
	{
	#define HTTP_MAX_BODY_STR_SIZE 1024
	static char html_body[HTTP_MAX_BODY_STR_SIZE];

	print_http_headers(ctx, html_body, HTTP_MAX_BODY_STR_SIZE);

	return http_response(ctx, HTTP_STATUS_200_OK, html_body,
	strlen(html_body), "Headers");
	}

	static int http_serve_index_html(struct http_ctx *ctx)
	{
	static const char index_html[] = {
	#include "index.html.inc"
	};

	NET_DBG("Sending index.html (%zd bytes) to client",
	sizeof(index_html));

	return http_response(ctx, HTTP_STATUS_200_OK, index_html,
	sizeof(index_html), "Index");
	}

	static void http_connected(struct http_ctx *ctx,
	enum http_connection_type type,
	void *user_data)
	{
	char url[32];
	int len = min(sizeof(url) - 1, ctx->http.url_len);

	memcpy(url, ctx->http.url, len);
	url[len] = '\0';

	NET_DBG("%s connect attempt URL %s",
	type == HTTP_CONNECTION ? "HTTP" : "WS", url);

	if (type == HTTP_CONNECTION) {
	if (strncmp(ctx->http.url, "/",
	ctx->http.url_len) == 0) {
	http_serve_index_html(ctx);
	http_close(ctx);
	return;
	}

	if (strncmp(ctx->http.url, "/index.html",
	ctx->http.url_len) == 0) {
	http_serve_index_html(ctx);
	http_close(ctx);
	return;
	}

	if (strncmp(ctx->http.url, "/headers",
	ctx->http.url_len) == 0) {
	http_serve_headers(ctx);
	http_close(ctx);
	return;
	}
	}

	/* Give 404 error for all the other URLs we do not want to handle
	* right now.
	*/
	http_response_soft_404(ctx);
	http_close(ctx);
	}

	static void http_received(struct http_ctx *ctx,
	struct net_pkt *pkt,
	int status,
	u32_t flags,
	void *user_data)
	{
	if (!status) {
	if (pkt) {
	NET_DBG("Received %d bytes data",
	net_pkt_appdatalen(pkt));
	net_pkt_unref(pkt);
	}
	} else {
	NET_ERR("Receive error (%d)", status);

	if (pkt) {
	net_pkt_unref(pkt);
	}
	}
	}

	static void http_sent(struct http_ctx *ctx,
	int status,
	void *user_data_send,
	void *user_data)
	{
	NET_DBG("%s sent", (char *)user_data_send);
	}

	static void http_closed(struct http_ctx *ctx,
	int status,
	void *user_data)
	{
	NET_DBG("Connection %p closed", ctx);
	}

	static const char get_string(int str_len, const char str)
	{
	static char buf[64];
	int len = min(str_len, sizeof(buf) - 1);

	memcpy(buf, str, len);
	buf[len] = '\0';

	return buf;
	}

	static enum http_verdict default_handler(struct http_ctx *ctx,
	enum http_connection_type type)
	{
	NET_DBG("No handler for %s URL %s",
	type == HTTP_CONNECTION ? "HTTP" : "WS",
	get_string(ctx->http.url_len, ctx->http.url));

	if (type == HTTP_CONNECTION) {
	http_response_soft_404(ctx);
	}

	return HTTP_VERDICT_DROP;
	}


	#if defined(CONFIG_HTTPS)
	/* Load the certificates and private RSA key. */

	static const char echo_apps_cert_der[] = {
	#include "echo-apps-cert.der.inc"
	};

	static const char echo_apps_key_der[] = {
	#include "echo-apps-key.der.inc"
	};

	static int setup_cert(struct net_app_ctx *app_ctx,
	mbedtls_x509_crt *cert,
	mbedtls_pk_context *pkey)
	{
	int ret;

	ret = mbedtls_x509_crt_parse(cert, echo_apps_cert_der,
	sizeof(echo_apps_cert_der));
	if (ret != 0) {
	NET_ERR("mbedtls_x509_crt_parse returned %d", ret);
	return ret;
	}

	ret = mbedtls_pk_parse_key(pkey, echo_apps_key_der,
	sizeof(echo_apps_key_der),
	NULL, 0);
	if (ret != 0) {
	NET_ERR("mbedtls_pk_parse_key returned %d", ret);
	return ret;
	}

	return 0;
	}
	#endif /* CONFIG_HTTPS */

	void main(void)
	{
	struct sockaddr addr, *server_addr;
	int ret;

	/*
	* There are several options here for binding to local address.
	* 1) The server address can be left empty in which case the
	* library will bind to both IPv4 and IPv6 addresses and to
	* port 80 which is the default.
	* 2) The server address can be partially filled, meaning that
	* the address can be left to 0 and port can be set if a value
	* other than 80 is desired. If the protocol family in sockaddr
	* is set to AF_UNSPEC, then both IPv4 and IPv6 socket is bound.
	* 3) The address can be set to some real value. There is a helper
	* function that can be used to fill the socket address struct.
	*/
	#define ADDR_OPTION 1

	#if ADDR_OPTION == 1
	server_addr = NULL;

	ARG_UNUSED(addr);

	#elif ADDR_OPTION == 2
	/* Accept any local listening address */
	memset(&addr, 0, sizeof(addr));

	net_sin(&addr)->sin_port = htons(ZEPHYR_PORT);

	/* In this example, listen only IPv4 */
	addr.family = AF_INET;

	server_addr = &addr;

	#elif ADDR_OPTION == 3
	/* Set the bind address according to your configuration */
	memset(&addr, 0, sizeof(addr));

	/* In this example, listen only IPv6 */
	addr.family = AF_INET6;

	ret = http_server_set_local_addr(&addr, ZEPHYR_ADDR, ZEPHYR_PORT);
	if (ret < 0) {
	NET_ERR("Cannot set local address (%d)", ret);
	panic(NULL);
	}

	server_addr = &addr;

	#else
	server_addr = NULL;

	ARG_UNUSED(addr);
	#endif

	http_server_add_default(&http_urls, default_handler);
	http_server_add_url(&http_urls, "/headers", HTTP_URL_STANDARD);
	http_server_add_url(&http_urls, "/index.html", HTTP_URL_STANDARD);
	http_server_add_url(&http_urls, "/", HTTP_URL_STANDARD);

	ret = http_server_init(&http_ctx, &http_urls, server_addr, http_result,
	sizeof(http_result), "Zephyr HTTP Server",
	NULL);
	if (ret < 0) {
	NET_ERR("Cannot initialize HTTP server (%d)", ret);
	panic(NULL);
	}

	#if defined(CONFIG_NET_CONTEXT_NET_PKT_POOL)
	net_app_set_net_pkt_pool(&http_ctx.app_ctx, tx_slab, data_pool);
	#endif

	http_set_cb(&http_ctx, http_connected, http_received,
	http_sent, http_closed);

	#if defined(CONFIG_HTTPS)
	ret = http_server_set_tls(&http_ctx,
	APP_BANNER,
	INSTANCE_INFO,
	strlen(INSTANCE_INFO),
	setup_cert,
	NULL,
	&ssl_rx_pool,
	https_stack,
	K_THREAD_STACK_SIZEOF(https_stack));
	if (ret < 0) {
	NET_ERR("Cannot enable TLS support (%d)", ret);
	}
	#endif

	/*
	* If needed, the HTTP parser callbacks can be set according to
	* applications own needs before enabling the server. In this example
	* we use the default callbacks defined in HTTP server API.
	*/

	http_server_enable(&http_ctx);
	}