Download Client Redirect Querry

[danielboe]

Hi,

I am using download_client to get a bigger file (100KB) to my memory via LTE-M. The Files are located in a bucket and I use a shortURL to get the signedDownload URL. If I use this short URL in Download Client I get the Error "http/1.1 301 moved permanently". This seems to be correct, the URL is initialy ofcourse a redirect. But how can I handle this in my code? I couldnt find a way to read the header files with download client nor do I see any option for redirect hops or something like this. Is there even a solution? Or is it the limits of the low level integration?

Thanks for helping and best regards

daniel

[dejans]

Hi Daniel,

The Files are located in a bucket and I use a shortURL to get the signedDownload URL.

Can you show how (and where in code) you use this shortURL?

If I use this short URL in Download Client I get the Error "http/1.1 301 moved permanently"

Can you provide full log which contains the error?

Best regards,
Dejan

[danielboe]

The ShortUrl is generated on a Serverside and send to the device. I can give you some snippet that shows how it works.

prj.conf:

# Download Client
CONFIG_DOWNLOAD_CLIENT=y
CONFIG_DOWNLOAD_CLIENT_STACK_SIZE=4096
CONFIG_DOWNLOAD_CLIENT_LOG_LEVEL_DBG=y

there is Downloader:

#define URL "http://ul1.epaperframe.de/NDUmX2z.dl"
static struct download_client downloader;
static struct download_client_cfg config = {};      
      
        if (awsGetCloudConnected() && !doOnce) {
            doOnce = true;
            LOG_INF("[MAIN] DL INIT");
            int err = download_client_init(&downloader, callbackDl);
            if (err) {
                printk("Failed to initialize the client, err %d", err);
            }

            err = download_client_get(&downloader, URL, &config, URL, 0);
            if (err) {
                printk("Failed to start the downloader, err %d", err);
                return 0;
            }

            printk("Downloading %s\n", URL);
        }

        if (dlClientDone) {
            dlClientDone = false;
            char recoverDataStr[2050] = {};
            strncpy(recoverDataStr, downloader.buf, sizeof(recoverDataStr));
            printk("%s a\n", recoverDataStr);
        }

And there is the callback:

static int callbackDl(const struct download_client_evt *event) {
    static size_t downloaded;
    static size_t file_size;

    if (downloaded == 0) {
        download_client_file_size_get(&downloader, &file_size);
        downloaded += 0;
    }

    switch (event->id) {
        case DOWNLOAD_CLIENT_EVT_FRAGMENT:
            downloaded += event->fragment.len;
            if (file_size) {
                progress_print(downloaded, file_size);
                char recoverDataStr[2200] = {};
                strncpy(recoverDataStr, event->fragment.buf, event->fragment.len);
                printk("%s \n", recoverDataStr);
            } else {
                printk("\r[ %d bytes ] ", downloaded);
            }
            return 0;
        case DOWNLOAD_CLIENT_EVT_CLOSED:
            printk("[DL] CLOSED\n");
            dlClientDone = true;
            return 0;
        case DOWNLOAD_CLIENT_EVT_DONE:
            printk("[DL] DONE\n");
            return 0;
        case DOWNLOAD_CLIENT_EVT_ERROR:
            printk("Error %d during download\n", event->error);
            return -1;
    }
    return 0;
}

I am not sure what you mean by more log, but here is a sample output with LOG DEBUG (DOWNLOAD_CLIENT_LOG_LEVEL_DBG):

00> *** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
00> *** Using Zephyr OS v3.6.99-100befc70c74 ***
00> I: [MAIN] Starting application 2.0.1
00> I: 16 Sectors of 4096 bytes
00> I: alloc wra: 2, fc0
00> I: data wra: 2, a20
00> I: [LED] led sample
00> I: [SPI] init
00> I: [DISPLAY] sleep start
00> I: [DISPLAY] WAIT finished
00> I: [DISPLAY] sleep done
00> I: [MAIN] Chip is NEW - set LTE-M
00> I: [MODEM] Modem Band Lock Set
00> I: [MODEM] Version: 2.0.1
00> I: [MODEM] Network registration status: Connected - roaming
00> I: [MODEM] PSM parameter update: TAU: 3240, Active time: -1
00> I: [MODEM] client_id: nrf-35940*
00> I: [AWS] iot_connect - init done
00> W: [AWS] iot_reconnect - wait 30 s connect try: 1/30
00> W: [AWS] IOT_EVT_CONNECTED
00> I: [MODEM] BOOT Image Confirmed
00> I: [MAIN] DL INIT
00> D: state = 1
00> I: Downloading: http://ul1.epaperframe.de/NDUmX2z.dl [0]
00> [MAIN] Downloading http://ul1.epaperframe.de/NDUmX2z.dl
00> D: Port not specified, using default: 80
00> D: Failed to resolve hostname ul1.epaperframe.de on IPv6
00> D: family: 1, type: 1, proto: 6
00> I: Connecting to 3.5.134.246
00> D: fd 1, addrlen 8, fam IPv4, port 80
00> D: state = 2
00> D: Receiving up to 2048 bytes at 0x2000cbd8...
00> D: Read 620 bytes from socket
00> D: GET header size: 620
00> E: Unexpected HTTP response: 301 moved permanently
00> [DL] Error -77 during download
00> D: state = 4
00> D: state = 0
00> [DL] CLOSED
00> D: Connection closed
00> [DL] Payload: "http/1.1 301 moved permanently"

The links are save to stay public But they wont work anymore after some time

The Download Client Sample worked fine btw. so thats not the issue.