nRF9160-DK HTTP POST REQUEST

[Gioele]

Hi!
We are trying to send an HTTP request to our AWS Web Server.
The problem that we are figuring out now is that we don't know the way to add a body to our request.
We based our code on the Connection Example provided by Nordic (https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/nrf9160/https_client/README.html), but It doesn't work. Sometimes we have no response and sometimes we obtain a "BAD REQUEST" response from the server.

#define BODY  "{ \"jsonrpc\": \"2.0\", \"method\": \"eth_chainId\" }"



#define HTTP_HEAD "POST HTTP/1.1\r\n"\
		"Host: "HTTPS_HOSTNAME"\r\n"\
		"Connection: close\r\n"\
	    "Content-type: application/json\r\n"\
		""BODY"\r\n\r\n"

We need your help! Thank you!

[Gioele]

The URL is included!

#define HTTPS_PORT 8545

#define HTTPS_HOSTNAME "ec2-184-73-45-204.compute-1.amazonaws.com"
#define BODY  "{ \"jsonrpc\": \"2.0\", \"method\": \"eth_chainId\" }"



#define HTTP_HEAD "POST HTTP/1.1\r\n"\
		"Host: "HTTPS_HOSTNAME"\r\n"\
		"Connection: close\r\n"\
	    "Content-type: application/json\r\n"\
		"\r\n"\
		""BODY"\r\n\r\n"

void main(void)
{
	int err;
	int fd;
	char *p;
	int bytes;
	size_t off;
	struct addrinfo *res;
	struct addrinfo hints = {
		.ai_family = AF_INET,
		.ai_socktype = SOCK_STREAM,
	};

	printk("HTTPS client sample started\n");

// #if !defined(CONFIG_SAMPLE_TFM_MBEDTLS)
// 	/* Provision certificates before connecting to the LTE network */
// 	err = cert_provision();
// 	if (err) {
// 		return;
// 	}
// #endif

	printk("Waiting for network.. \n");
	err = lte_lc_init_and_connect();
	if (err) {
		printk("Failed to connect to the LTE network, err %d\n", err);
		return;
	}
	printk("OK\n");

	err = getaddrinfo(HTTPS_HOSTNAME, NULL, &hints, &res);
	if (err) {
		printk("getaddrinfo() failed, err %d\n", errno);
		return;
	}

	((struct sockaddr_in *)res->ai_addr)->sin_port = htons(HTTPS_PORT);

	if (IS_ENABLED(CONFIG_SAMPLE_TFM_MBEDTLS)) {
		fd = socket(AF_INET, SOCK_STREAM | SOCK_NATIVE_TLS, IPPROTO_TCP);
	} else {
		fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	}
	if (fd == -1) {
		printk("Failed to open socket!\n");
		goto clean_up;
	}

	// /* Setup TLS socket options */
	// err = tls_setup(fd);
	// if (err) {
	// 	goto clean_up;
	// }

	printk("Connecting to %s\n", HTTPS_HOSTNAME);
	err = connect(fd, res->ai_addr, sizeof(struct sockaddr_in));
	if (err) {
		printk("connect() failed, err: %d\n", errno);
		goto clean_up;
	}

	off = 0;
	do {
		bytes = send(fd, &send_buf[off], HTTP_HEAD_LEN - off, 0);
		if (bytes < 0) {
			printk("send() failed, err %d\n", errno);
			goto clean_up;
		}
		off += bytes;
		printk("\n>\t %s\n\n", send_buf);


	} while (off < HTTP_HEAD_LEN);

	printk("Sent %d bytes\n", off);


	off = 0;
	do {
		bytes = recv(fd, &recv_buf[off], RECV_BUF_SIZE - off, 0);
		if (bytes < 0) {
			printk("recv() failed, err %d\n", errno);
			goto clean_up;
		}
		off += bytes;
		printk("Sto ricevendo bytes\n");
		printk("%d bytes\n", bytes);

	} while (bytes != 0 /* peer closed connection */);

	printk("Received %d bytes\n", off);

	/* Print HTTP response */
	p = strstr(recv_buf, "\r\n");
	if (p) {
		off = p - recv_buf;
		recv_buf[off + 1] = '\0';
		printk("\n>\t %s\n\n", recv_buf);
	}

	int tot_num_bytes = 0;

	printk("Finished, closing socket.\n");
	freeaddrinfo(res);

(void)close(fd);

	lte_lc_power_off();
	
clean_up:
	freeaddrinfo(res);
	(void)close(fd);

	lte_lc_power_off();
}

[Didrik Rokhaug]

Where?

I still don't see any URL between the request method (POST) and the protocol version (HTTP/1.1)

[Gioele]

This is the URL #define HTTPS_HOSTNAME "ec2-184-73-45-204.compute-1.amazonaws.com"

If I make the same request on PostMan it runs!

[Didrik Rokhaug]

No, that is the hostname. You also need the path to the resource you want to get/modify.

Try add a '/' between the request method and the protocol version (separated by spaces), if you want  to modify the root object.

[Gioele]

We tried to add a "/" but we have the same error. This is the exact request that we make on Postman.