XHTTPCREQ GET request download file in chunks

[yesheng]

Hi,

I'm using nRF9160 SLM FW. I'd like to download a device FW via XHTTPCREQ GET method. I can get the entire file at once, but I'm wondering if it's possible to download a file in chunks? i.e. download the first 1KB, 2nd KB, 3rd KB... etc.? So I could store into flash without losing data.

Thanks,

Ye-Sheng

[Amanda Hsieh]

Hi, 

Check out HTTP request #XHTTPCREQ with <chunked_transfer> flag

Regards,
Amanda H.

[yesheng]

Hi Amanda,

Thanks for your reply. However, I'm not entirely sure how to use this flag. Could you show me the proper syntax if I want to download a file from "example.com/test.txt", and split it into multiple chunks?

Thanks,

[Amanda Hsieh]

Hi, 

Our expert thinks HTTP chunked transfer is for streaming, not for splittd downloading. In order to download by segments, HTTP range request is the proper solution.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests

Check how it is used in NCS download_client library.
https://github.com/nrfconnect/sdk-nrf/blob/main/subsys/net/lib/download_client/src/http.c#L36
MCU will need to calculate offset and do the same in the request header.

-Amanda H.

[yesheng]

Hi Amanda,

Thanks, I guess it supports only HTTPS at the moment.