Sending file over HTTP - Bad Request

RE: Sending file over HTTP - Bad Request

Håkon Alseth — Wed, 22 Feb 2023 14:26:25 GMT

Hi!

Glad to hear that you found a solution!

Cheers,

Håkon

RE: Sending file over HTTP - Bad Request

A. Mullot — Wed, 22 Feb 2023 09:41:18 GMT

Hi,

I found what the problem was. I didn't have to call the socket as non-blocking with fcntl(). Actually, for my application, the server answer always is below 2048 bytes (the size of the recv_buf). So I only have to call recv() once, and the whole answer will fit in the reception buffer. The only thing I could do otherwise would be to call recv() while there isn't "\r\n\r\n" in the answer.

Thank you for the help !

Kind regards,

Armand

RE: Sending file over HTTP - Bad Request

A. Mullot — Tue, 21 Feb 2023 15:44:21 GMT

Hi,

Thanks for your answer.

I realized I did have a content-length issue, however this seems solved. I am now meeting another problem : the recv() function (official doc) never returns... Here is the part of the code from the https_client sample (https_client sample) that causes trouble :

off = 0;
	do {
		printk("Before recv()\n");
		bytes = recv(fd, &recv_buf[off], RECV_BUF_SIZE - off, 0);
		printk("After recv()\n");
		if (bytes < 0) {
			LOG_ERR("recv() failed, err %d", errno);
			clean_up();
		}
		off += bytes;
	} while (bytes != 0 /* peer closed connection */);

The output is the following :

The recv() function is called one first time, and runs just fine. It returns 148 at the first iteration. It is in the second iteration that it keeps the whole program from moving on.

I suspect that this is caused by the \r\n\r\n that you mentionned before. Maybe the end of the request is not clearly identified by the server ?

Anyway, I'll keep on investigating this, and thanks for your suggestions.

By the way, I had already updated the CA to fit my server.

EDIT : I realized that the code gets stuck in recv() because it is called as blocking. I'm trying to change this, using fcntl(fd, F_SETFL, O_NONBLOCK); but without great success so far. I'll let you know.

Kind regards,

Armand

RE: Sending file over HTTP - Bad Request

Håkon Alseth — Tue, 21 Feb 2023 14:09:20 GMT

Hi,

If you want to upload a file, you need to construct your POST correctly.

"\r\n\r\n" is effectively end of the header, so your current POST might not behave as you intend it to. You should also dynamically align the Content-Length according to your http body length.

https://stackoverflow.com/questions/50447483/end-of-http-header

A side-note, if you are using HTTPS, be sure to change your CA root according to the domain that you're connecting to. You can see the chain by using openssl, similar to what is done here:

RE: changing certificate in https_client sample

Kind regards,

Håkon