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Nordic Case Info
  • Case ID: 259790
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AT#XHTTPCREQ serial_lte_modem does not handle chunked HTTP response

user95514

if a response to the http request is chunked (https://en.wikipedia.org/wiki/Chunked_transfer_encoding), it is not handled correctly by the serial_lte_modem.

Sometimes - e.g. if cloudflare is used, it is not possible to disable chunk encoding, so the serial_lte_modem app is unusable in these scenarios.

00> [00:03:22.707,031] <inf> httpc: Partial data received (743 bytes)
00> [00:03:22.707,061] <inf> httpc: All the data received (743 bytes)
00> [00:03:22.707,489] <inf> at_host: TX
00> 23 58 48 54 54 50 43 52  53 50 3a 37 34 33 2c 30 |#XHTTPCR SP:743,0
00> 0d 0a                                            |..               
00> [00:03:22.709,625] <inf> at_host: TX
00> 22 7d 5d 2c 22 67 72 6f  75 70 22 3a 22 63 66 2d |"}],"gro up":"cf-
00> 6e 65 6c 22 2c 22 6d 61  78 5f 61 67 65 22 3a 36 |nel","ma x_age":6
00> 30 34 38 30 30 7d 0d 0a  4e 45 4c 3a 20 7b 22 72 |04800}.. NEL: {"r
00> 65 70 6f 72 74 5f 74 6f  22 3a 22 63 66 2d 6e 65 |eport_to ":"cf-ne
00> 6c 22 2c 22 6d 61 78 5f  61 67 65 22 3a 36 30 34 |l","max_ age":604
00> 38 30 30 7d 0d 0a 53 65  72 76 65 72 3a 20 63 6c |800}..Se rver: cl
00> 6f 75 64 66 6c 61 72 65  0d 0a 43 46 2d 52 41 59 |oudflare ..CF-RAY
00> 3a 20 35 66 31 62 30 35  63 34 39 66 63 35 64 34 |: 5f1b05 c49fc5d4
00> 33 66 2d 48 41 4d 0d 0a  0d 0a 44 65 76 69 63 65 |3f-HAM.. ..Device
00> 20 31 38 32 30 65 66 66  64 20 77 61 73 20 6e 6f | 1820eff d was no
00> 74 20 66 6f 75 6e 64 64  34 39 37 36 63 30 32 39 |t foundd 4976c029
00> 37 37 37 30 38 64 39 66  62 35 36 33 31 30 34 65 |77708d9f b563104e
00> 36 62 30 61 31 31 31 34  31 36 30 35 32 39 37 30 |6b0a1114 16052970
00> 33 34 3b 20 65 78 70 69  72 65 73 3d 53 75 6e 2c |34; expi res=Sun,
00> 20 31 33 2d 44 65 63 2d  32 30 20 31 39 3a 35 30 | 13-Dec- 20 19:50
00> 3a 33 34 20 47 4d 54 3b  20 70 61 74 68 3d 2f 3b |:34 GMT;  path=/;
00> 20 64 6f 6d 61 69 6e 3d  2e 67 77 78 63 6c 6f 75 | domain= .gwxclou
00> 64 2e 63 6f 6d 3b 20 48  74 74 70 4f 6e 6c 79 3b |d.com; H ttpOnly;
00> 20 53 61 6d 65 53 69 74  65 3d 4c 61 78 0d 0a 43 | SameSit e=Lax..C
00> 46 2d 43 61 63 68 65 2d  53 74 61 74 75 73 3a 20 |F-Cache- Status: 
00> 44 59 4e 41 4d 49 43 0d  0a 63 66 2d 72 65 71 75 |DYNAMIC. .cf-requ
00> 65 73 74 2d 69 64 3a 20  30 36 36 34 63 31 65 65 |est-id:  0664c1ee
00> 64 63 30 30 30 30 64 34  33 66 36 38 38 37 30 30 |dc0000d4 3f688700
00> 30 30 30 30 30 30 30 31  0d 0a 52 65 70 6f 72 74 |00000001 ..Report
00> 2d 54 6f 3a 20 7b 22 65  6e 64 70 6f 69 6e 74 73 |-To: {"e ndpoints
00> 22 3a 5b 7b 22 75 72 6c  22 3a 22 68 74 74 70 73 |":[{"url ":"https
00> 3a 5c 2f 5c 2f 61 2e 6e  65 6c 2e 63 6c 6f 75 64 |:\/\/a.n el.cloud
00> 66 6c 61 72 65 2e 63 6f  6d 5c 2f 72 65 70 6f 72 |flare.co m\/repor
00> 74 3f 73 3d 4e 65 75 57  66 46 50 6b 75 47 25 32 |t?s=NeuW fFPkuG%2
00> 46 4e 61 61 4f 4f 43 65  69 70 41 51 4d 59 75 53 |FNaaOOCe ipAQMYuS
00> 75 61 69 39 36 25 32 46  7a 4e 6c 61 49 6d 50 49 |uai96%2F zNlaImPI
00> 74 72 52 44 67 7a 45 4f  55 61 4a 41 6e 78 66 51 |trRDgzEO UaJAnxfQ
00> 75 47 4f 74 34 75 34 73  52 48 46 5a 65 74 49 67 |uGOt4u4s RHFZetIg
00> 34 34 7a 34 74 6c 54 53  45 32 57 62 49 70 42 38 |44z4tlTS E2WbIpB8
00> 46 58 43 36 67 71 57 52  5a 4c 43 38 4f 69 41 41 |FXC6gqWR ZLC8OiAA
00> 44 43 7a 70 59 77 58 49  34 77 25 33 44 25 33 44 |DCzpYwXI 4w%3D%3D
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........
00> 00 00 00 00 00 00 00                             |.......

Parents
  • 0

    Hi, Michal!

    Thank you for reporting this. I will bring the info to the developers. 

    Best regards,
    Carl Richard

  • 0 in reply to user68044

    Hi Carl,

    do you have any info or ETA when this might be fixed? It is a big problem for us, basically making the serial_lte_modem unsusable in production and therefore delaying production of nrf91 based devices.

    Best regards, Michal V.

  • 0 in reply to user68044

    OK, so I've tried that, due to various limitations (such as domain whitelisting on our SIM, DNS config etc..) I've only been able to test it with gwxcloud.com, that is not set up and returns an error. But this error goes through cloudflare, so it is returned with chunked encoding.

    "Log" from LTE link monitor:

    AT#XHTTPCCON=1,"gwxcloud.com",80#XHTTPCCON:1OKAT#XHTTPCREQ="GET","/",""OK#XHTTPCREQ:0#XHTTPCRSP:3489,0</div></body></html>0f="https://docs.microsoft.com/en-us/azure/app-service-web/app-service-web-tutorial-custom-domain">how to map an existing domain</a> to resolve this.</li>                <li>Client cache is still pointing the domain to old IP address. Clear the cache by running the command <i>ipconfig/flushdns.</i></li>            </ul>            <p>Checkout <a href="https://blogs.msdn.microsoft.com/appserviceteam/2017/08/08/faq-app-service-domain-preview-and-custom-domains/">App Service Domain FAQ</a> for more questions.</p>        </div>     5b8): Calling callback for partitioned 33 len data[0m[00:14:11.286,865] [0m<dbg> net_http.on_message_complete: (0x200215b8): -- HTTP GET response (complete) --[0m,723] [0m<dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 180 len data[0m[00:14:11.017,303] [0m<dbg> net_http.on_body: (0x200215b8): Processed 2128 length 528[0m[00:14:11.017,700] [0m<dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 528 len data[0m[00:14:11.284,210] [0m<dbg> net_http.on_body: (0x200215b8): Processed 2176 length 48[0m[00:14:11.284,606] [0m<dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 48 len data[0m[00:14:11.285,125] [0m<dbg> net_http.on_body: (0x200215b8): Processed 2752 length 576[0m[00:14:11.285,491] [0m<dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 576 len data[0m[00:14:11.286,010] [0m<dbg> net_http.on_body: (0x200215b8): Processed 2778 length 26[0m[00:14:11.286,407] [0m<dbg> net_http.on_body: (0x20021901288004468357KKK

    Log collected over J-Link:

    00> [00:13:56.049,255] <inf> at_cmd: Enqueueing response for sync call
00> [00:13:56.049,621] <inf> at_cmd: Writing any pending command
00> [00:13:56.049,896] <inf> at_cmd: Listening on socket
00> [00:14:05.527,923] <inf> httpc: Attempting to connect over IPv6
00> [00:14:05.528,625] <err> httpc: Unable to connect, errno 114
00> [00:14:05.529,449] <inf> httpc: Attempting to connect over IPv4
00> [00:14:06.104,309] <inf> httpc: Connected to gwxcloud.com
00> [00:14:09.014,923] <dbg> net_http.Data to send
00> 47 45 54 20 2f 20 48 54  54 50 2f 31 2e 31 0d 0a |GET / HT TP/1.1..
00> 48 6f 73 74 3a 20 67 77  78 63 6c 6f 75 64 2e 63 |Host: gw xcloud.c
00> 6f 6d 0d 0a                                      |om..             
00> [00:14:09.016,693] <dbg> net_http.Data to send
00> 0d 0a                                            |..               
00> [00:14:09.017,578] <dbg> net_http.http_client_req: (0x200215b8): Sent 54 bytes
00> [00:14:10.118,286] <dbg> net_http.on_message_begin: (0x200215b8): -- HTTP GET response (headers) --
00> [00:14:10.118,743] <dbg> net_http.on_status: (0x200215b8): HTTP response status 404 Site Not Found
00> [00:14:10.119,415] <dbg> net_http.print_header_field: (0x200215b8): [4] Date
00> [00:14:10.120,056] <dbg> net_http.print_header_field: (0x200215b8): [29] Thu, 26 Nov 2020 10:39:44 GMT
00> [00:14:10.120,758] <dbg> net_http.print_header_field: (0x200215b8): [12] Content-Type
00> [00:14:10.121,398] <dbg> net_http.print_header_field: (0x200215b8): [9] text/html
00> [00:14:10.122,039] <dbg> net_http.print_header_field: (0x200215b8): [17] Transfer-Encoding
00> [00:14:10.122,680] <dbg> net_http.print_header_field: (0x200215b8): [7] chunked
00> [00:14:10.123,291] <dbg> net_http.print_header_field: (0x200215b8): [10] Connection
00> [00:14:10.123,931] <dbg> net_http.print_header_field: (0x200215b8): [10] keep-alive
00> [00:14:10.124,511] <dbg> net_http.print_header_field: (0x200215b8): [10] Set-Cookie
00> [00:14:10.125,183] <dbg> net_http.print_header_field: (0x200215b8): [127] __cfduid=d4df0e26ea5b2e8ad1dadbe95da3bc9aa1606387183; expires=Sat, 26-Dec-20 10:39:43 GMT; path=/; domain=.gwxcloud.com; HttpOn
00> [00:14:10.126,068] <dbg> net_http.print_header_field: (0x200215b8): [15] CF-Cache-Status
00> [00:14:10.131,835] <dbg> net_http.print_header_field: (0x200215b8): [7] DYNAMIC
00> [00:14:10.132,324] <dbg> net_http.print_header_field: (0x200215b8): [13] cf-request-id
00> [00:14:10.132,873] <dbg> net_http.print_header_field: (0x200215b8): [32] 06a5bc48ce0000fa18d4292000000001
00> [00:14:10.133,392] <dbg> net_http.print_header_field: (0x200215b8): [9] Report-To
00> [00:14:10.133,972] <dbg> net_http.print_header_field: (0x200215b8): [127] {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report?s=WxfmvBeE3cOvi%2BNieDfBJUAiKLX1LXjjJy3Gv%2FAt4nx8hR2W5ko69d0fKvmC
00> [00:14:10.135,070] <dbg> net_http.print_header_field: (0x200215b8): [23] -nel","max_age":604800}
00> [00:14:10.135,772] <dbg> net_http.print_header_field: (0x200215b8): [3] NEL
00> [00:14:10.136,413] <dbg> net_http.print_header_field: (0x200215b8): [39] {"report_to":"cf-nel","max_age":604800}
00> [00:14:10.137,145] <dbg> net_http.print_header_field: (0x200215b8): [6] Server
00> [00:14:10.137,786] <dbg> net_http.print_header_field: (0x200215b8): [10] cloudflare
00> [00:14:10.138,397] <dbg> net_http.print_header_field: (0x200215b8): [6] CF-RAY
00> [00:14:10.139,007] <dbg> net_http.print_header_field: (0x200215b8): [20] 5f82fcbae8d9fa18-AMS
00> [00:14:10.139,404] <dbg> net_http.on_headers_complete: (0x200215b8): Headers complete
00> [00:14:10.145,050] <dbg> net_http.on_body: (0x200215b8): Processed 4 length 4
00> [00:14:10.145,385] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 708 len data
00> [00:14:10.413,330] <dbg> net_http.on_body: (0x200215b8): Processed 448 length 444
00> [00:14:10.413,757] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 444 len data
00> [00:14:10.414,276] <dbg> net_http.on_body: (0x200215b8): Processed 712 length 264
00> [00:14:10.414,642] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 264 len data
00> [00:14:10.712,280] <dbg> net_http.on_body: (0x200215b8): Processed 1024 length 312
00> [00:14:10.712,677] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 312 len data
00> [00:14:10.713,226] <dbg> net_http.on_body: (0x200215b8): Processed 1420 length 396
00> [00:14:10.713,623] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 396 len data
00> [00:14:11.016,357] <dbg> net_http.on_body: (0x200215b8): Processed 1600 length 180
00> [00:14:11.016,723] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 180 len data
00> [00:14:11.017,303] <dbg> net_http.on_body: (0x200215b8): Processed 2128 length 528
00> [00:14:11.017,700] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 528 len data
00> [00:14:11.284,210] <dbg> net_http.on_body: (0x200215b8): Processed 2176 length 48
00> [00:14:11.284,606] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 48 len data
00> [00:14:11.285,125] <dbg> net_http.on_body: (0x200215b8): Processed 2752 length 576
00> [00:14:11.285,491] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 576 len data
00> [00:14:11.286,010] <dbg> net_http.on_body: (0x200215b8): Processed 2778 length 26
00> [00:14:11.286,407] <dbg> net_http.on_body: (0x200215b8): Calling callback for partitioned 33 len data
00> [00:14:11.286,865] <dbg> net_http.on_message_complete: (0x200215b8): -- HTTP GET response (complete) --
00> [00:14:11.289,337] <dbg> net_http.http_client_req: (0x200215b8): Received 3489 bytes

  • 0 in reply to user95514

    Thank you, Michal! I'll forward this.

    From the logs it seems like the logging suddenly begins to write to the LTE Link Monitor (rather than serial). Can you confirm that this it what's happening? 

    Best regards,
    Carl Richard

  • 0 in reply to user68044

    Thank you for a fast response.

    Yes, but this has only happened to me when running the app with the debug logging enabled. Without it this "side-issue" was not present. But you can still see from th LTE Link Monitor "log" that the http response is broken, as it begins with `0</div></body></html>`.

    BR, Michal V.

  • 0 in reply to user95514

    I understand. The developer suspects that this has to do with issues with the thread memory or some buffer overflowing, but I saw that you have pointed to a specific line in the slm_at_host.c, so I'm looking into what trouble that may cause.

    Have a good weekend!

    Best regards,
    Carl Richard

  • 0 in reply to user68044

    Thank you for the info. The specific line in slm_at_host.c (https://devzone.nordicsemi.com/f/nordic-q-a/68346/problems-passing-payload-to-at-xhttpcreq-in-serial_lte_modem) has to do with passing payload to the request, it is unrelated to this issue.

    Wish you a nice weekend as well, BR Michal V.

Reply Children
  • 0 in reply to user95514

    I see! My misunderstanding.

    The developer has purposed a fix in this pull request. Could you test it by replacing the attached and updated slm_at_httpc.c in your project?
    From his tests it should solve the problems with the cloudflair cloud.



    Best regards,
    Carl Richard

  • 0 in reply to user68044

    Hi, thank you, this fix has indeed resolved the problem with chunked transport and cloudflare. However since I patched the file in our code, our subsequent code (json parsing etc..) is failing. I'm investigating it to see if it is related to this fix or it is a bug in our code. 

    BR, Michal V.

  • 0 in reply to user68044

    So I've found where the problem is - the length of the chunk is included in the response from XHTTPCREQ and that crashes the json parser. So I belive that chunked responses are still not handled correctly. But I can confirm that the issue with buffer has been fixed.

    NRF91 log:

    00> [00:07:02.802,215] <dbg> net_http.on_message_begin: (0x20021628): -- HTTP POST response (headers) --
00> [00:07:02.802,612] <dbg> net_http.on_status: (0x20021628): HTTP response status 200 OK
00> [00:07:02.804,779] <dbg> net_http.print_header_field: (0x20021628): [4] Date
00> [00:07:02.805,541] <dbg> net_http.print_header_field: (0x20021628): [29] Tue, 01 Dec 2020 14:29:39 GMT
00> [00:07:02.806,365] <dbg> net_http.print_header_field: (0x20021628): [12] Content-Type
00> [00:07:02.807,098] <dbg> net_http.print_header_field: (0x20021628): [31] application/json; charset=utf-8
00> [00:07:02.807,891] <dbg> net_http.print_header_field: (0x20021628): [17] Transfer-Encoding
00> [00:07:02.808,624] <dbg> net_http.print_header_field: (0x20021628): [7] chunked
00> [00:07:02.809,356] <dbg> net_http.print_header_field: (0x20021628): [10] Connection
00> [00:07:02.810,028] <dbg> net_http.print_header_field: (0x20021628): [10] keep-alive
00> [00:07:02.810,729] <dbg> net_http.print_header_field: (0x20021628): [10] Set-Cookie
00> [00:07:02.811,492] <dbg> net_http.print_header_field: (0x20021628): [127] __cfduid=d6359a98730e1dcfa60b181709cdefba01606832978; expires=Thu, 31-Dec-20 14:29:38 GMT; path=/; domain=.gwxcloud.com; HttpOn
00> [00:07:02.812,438] <dbg> net_http.print_header_field: (0x20021628): [4] vary
00> [00:07:02.814,910] <dbg> net_http.print_header_field: (0x20021628): [15] Accept-Encoding
00> [00:07:02.815,551] <dbg> net_http.print_header_field: (0x20021628): [15] CF-Cache-Status
00> [00:07:02.816,528] <dbg> net_http.print_header_field: (0x20021628): [7] DYNAMIC
00> [00:07:02.817,108] <dbg> net_http.print_header_field: (0x20021628): [13] cf-request-id
00> [00:07:02.818,267] <dbg> net_http.print_header_field: (0x20021628): [32] 06c04e94010000d44788baf000000001
00> [00:07:02.819,305] <dbg> net_http.print_header_field: (0x20021628): [9] Report-To
00> [00:07:02.820,190] <dbg> net_http.print_header_field: (0x20021628): [127] {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report?s=jj2GNMCYecVq5hD8ci0dB2gKd6f75hi6eoWByctGmAhyCV07FX7T8PZA76aOwnBk
00> [00:07:02.823,120] <dbg> net_http.print_header_field: (0x20021628): [3] NEL
00> [00:07:02.823,608] <dbg> net_http.print_header_field: (0x20021628): [39] {"report_to":"cf-nel","max_age":604800}
00> [00:07:02.824,096] <dbg> net_http.print_header_field: (0x20021628): [6] Server
00> [00:07:02.824,554] <dbg> net_http.print_header_field: (0x20021628): [10] cloudflare
00> [00:07:02.850,463] <dbg> net_http.print_header_field: (0x20021628): [6] CF-RAY
00> [00:07:02.851,165] <dbg> net_http.print_header_field: (0x20021628): [20] 5fad80666f7ad447-HAM
00> [00:07:02.851,562] <dbg> net_http.on_headers_complete: (0x20021628): No body expected
00> [00:07:02.851,898] <dbg> net_http.on_message_complete: (0x20021628): -- HTTP POST response (complete) --
00> [00:07:02.852,355] <inf> at_host: TX
00> 23 58 48 54 54 50 43 52  53 50 3a 38 33 32 2c 30 |#XHTTPCR SP:832,0
00> 0d 0a                                            |..               
00> [00:07:02.854,827] <inf> at_host: TX
00> 48 54 54 50 2f 31 2e 31  20 32 30 30 20 4f 4b 0d |HTTP/1.1  200 OK.
00> 0a 44 61 74 65 3a 20 54  75 65 2c 20 30 31 20 44 |.Date: T ue, 01 D
00> 65 63 20 32 30 32 30 20  31 34 3a 32 39 3a 33 39 |ec 2020  14:29:39
00> 20 47 4d 54 0d 0a 43 6f  6e 74 65 6e 74 2d 54 79 | GMT..Co ntent-Ty
00> 70 65 3a 20 61 70 70 6c  69 63 61 74 69 6f 6e 2f |pe: appl ication/
00> 6a 73 6f 6e 3b 20 63 68  61 72 73 65 74 3d 75 74 |json; ch arset=ut
00> 66 2d 38 0d 0a 54 72 61  6e 73 66 65 72 2d 45 6e |f-8..Tra nsfer-En
00> 63 6f 64 69 6e 67 3a 20  63 68 75 6e 6b 65 64 0d |coding:  chunked.
00> 0a 43 6f 6e 6e 65 63 74  69 6f 6e 3a 20 6b 65 65 |.Connect ion: kee
00> 70 2d 61 6c 69 76 65 0d  0a 53 65 74 2d 43 6f 6f |p-alive. .Set-Coo
00> 6b 69 65 3a 20 5f 5f 63  66 64 75 69 64 3d 64 36 |kie: __c fduid=d6
00> 33 35 39 61 39 38 37 33  30 65 31 64 63 66 61 36 |359a9873 0e1dcfa6
00> 30 62 31 38 31 37 30 39  63 64 65 66 62 61 30 31 |0b181709 cdefba01
00> 36 30 36 38 33 32 39 37  38 3b 20 65 78 70 69 72 |60683297 8; expir
00> 65 73 3d 54 68 75 2c 20  33 31 2d 44 65 63 2d 32 |es=Thu,  31-Dec-2
00> 30 20 31 34 3a 32 39 3a  33 38 20 47 4d 54 3b 20 |0 14:29: 38 GMT; 
00> 70 61 74 68 3d 2f 3b 20  64 6f 6d 61 69 6e 3d 2e |path=/;  domain=.
00> 67 77 78 63 6c 6f 75 64  2e 63 6f 6d 3b 20 48 74 |gwxcloud .com; Ht
00> 74 70 4f 6e 6c 79 3b 20  53 61 6d 65 53 69 74 65 |tpOnly;  SameSite
00> 3d 4c 61 78 0d 0a 76 61  72 79 3a 20 41 63 63 65 |=Lax..va ry: Acce
00> 70 74 2d 45 6e 63 6f 64  69 6e 67 0d 0a 43 46 2d |pt-Encod ing..CF-
00> 43 61 63 68 65 2d 53 74  61 74 75 73 3a 20 44 59 |Cache-St atus: DY
00> 4e 41 4d 49 43 0d 0a 63  66 2d 72 65 71 75 65 73 |NAMIC..c f-reques
00> 74 2d 69 64 3a 20 30 36  63 30 34 65 39 34 30 31 |t-id: 06 c04e9401
00> 30 30 30 30 64 34 34 37  38 38 62 61 66 30 30 30 |0000d447 88baf000
00> 30 30 30 30 30 31 0d 0a  52 65 70 6f 72 74 2d 54 |000001.. Report-T
00> 6f 3a 20 7b 22 65 6e 64  70 6f 69 6e 74 73 22 3a |o: {"end points":
00> 5b 7b 22 75 72 6c 22 3a  22 68 74 74 70 73 3a 5c |[{"url": "https:\
00> 2f 5c 2f 61 2e 6e 65 6c  2e 63 6c 6f 75 64 66 6c |/\/a.nel .cloudfl
00> 61 72 65 2e 63 6f 6d 5c  2f 72 65 70 6f 72 74 3f |are.com\ /report?
00> 73 3d 6a 6a 32 47 4e 4d  43 59 65 63 56 71 35 68 |s=jj2GNM CYecVq5h
00> 44 38 63 69 30 64 42 32  67 4b 64 36 66 37 35 68 |D8ci0dB2 gKd6f75h
00> 69 36 65 6f 57 42 79 63  74 47 6d 41 68 79 43 56 |i6eoWByc tGmAhyCV
00> 30 37 46 58 37 54 38 50  5a 41 37 36 61 4f 77 6e |07FX7T8P ZA76aOwn
00> 42 6b 42 55 33 36 68 54  78 58 30 42 6f 70 48 53 |BkBU36hT xX0BopHS
00> 37 6f 6e 63 50 69 79 75  52 6d 78 34 52 43 77 58 |7oncPiyu Rmx4RCwX
00> 67 51 6f 6b 68 69 49 36  37 49 4c 77 30 6a 57 75 |gQokhiI6 7ILw0jWu
00> 38 4d 4f 67 25 33 44 25  33 44 22 7d 5d 2c 22 67 |8MOg%3D% 3D"}],"g
00> 72 6f 75 70 22 3a 22 63  66 2d 6e 65 6c 22 2c 22 |roup":"c f-nel","
00> 6d 61 78 5f 61 67 65 22  3a 36 30 34 38 30 30 7d |max_age" :604800}
00> 0d 0a 4e 45 4c 3a 20 7b  22 72 65 70 6f 72 74 5f |..NEL: { "report_
00> 74 6f 22 3a 22 63 66 2d  6e 65 6c 22 2c 22 6d 61 |to":"cf- nel","ma
00> 78 5f 61 67 65 22 3a 36  30 34 38 30 30 7d 0d 0a |x_age":6 04800}..
00> 53 65 72 76 65 72 3a 20  63 6c 6f 75 64 66 6c 61 |Server:  cloudfla
00> 72 65 0d 0a 43 46 2d 52  41 59 3a 20 35 66 61 64 |re..CF-R AY: 5fad
00> 38 30 36 36 36 66 37 61  64 34 34 37 2d 48 41 4d |80666f7a d447-HAM
00> 0d 0a 0d 0a 35 36 0d 0a  7b 22 64 61 74 61 22 3a |....56.. {"data":
00> 22 33 35 38 32 65 32 31  39 32 39 30 30 39 39 64 |"3582e21 9290099d
00> 38 62 34 38 62 66 61 34  38 31 34 38 65 39 64 35 |8b48bfa4 8148e9d5
00> 34 64 31 38 34 35 64 63  64 64 36 62 30 62 66 32 |4d1845dc dd6b0bf2
00> 37 63 30 37 64 30 30 66  30 63 36 61 32 32 31 66 |7c07d00f 0c6a221f
00> 61 22 2c 22 63 6d 64 22  3a 6e 75 6c 6c 7d 0d 0a |a","cmd" :null}..

    On the line 79, it can be seen that there is: CR LF CR LF (separator of headers and body in HTTP) 56 CR LF (hex length of the chunk and CR LF as chunk length separator), the `56 CR LF` should not be there. 

    `00> 0d 0a 0d 0a 35 36 0d 0a  7b 22 64 61 74 61 22 3a |....56.. {"data":`

    In this simple case we can work around the issue, but I'm not sure whether the solution would hold if the body is transferred in more than one chunk.

  • 0 in reply to user95514

    Good to hear that the fix worked to a certain extent even though it revealed more issues. I'm working with the developer to sort it out!

    Best regards,
    Carl Richard

  • 0 in reply to user68044

    Hi again, Michal!

    A fix should have been pushed to the NCS master branch now. As described in the pull request the body was skipped. If you want to stay on 1.4.0 remove the following code from zephyr/subsys/net/lib/http/http_client.c : 

    if ((req->method == HTTP_PUT || req->method == HTTP_POST) &&
    req->internal.response.content_length == 0) {
	NET_DBG("No body expected");
	return 1;
}


    This should also fix the issue with the modem crashing, mentioned in your other ticket. Please report back there if it doesn't!

    Best regards,
    Carl Richard

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