"Server did not honor partial content request"

Question

Hey DZ,

I'm having some trouble with the download_client. It's not playing nice with the HTTP server I'm using. On the last chunk of data, the nRF91 is issuing a Content-Range that doesn't always play nice with all server implementations. The server I'm using is returning a 416 error.

Here's the progress from the embedded side:

2021-03-09T02:02:42.279Z DEBUG modem << [00:01:00.078,948] [0m<inf> download_client: Downloaded 194560/200595 bytes (96%)[0m
2021-03-09T02:02:42.760Z DEBUG modem << [00:01:00.558,929] [0m<inf> download_client: Downloaded 196608/200595 bytes (98%)[0m
2021-03-09T02:02:43.135Z DEBUG modem << [00:01:00.934,387] [0m<inf> download_client: Downloaded 198656/200595 bytes (99%)[0m
2021-03-09T02:02:43.529Z DEBUG modem << [00:01:01.325,347] [1;31m<err> download_client: Server did not honor partial content request[0m
2021-03-09T02:02:43.558Z DEBUG modem << [00:01:01.335,388] [1;31m<err> fota_download: Download client error[0m
2021-03-09T02:02:43.559Z DEBUG modem << [00:01:01.341,766] [0m<inf> dfu_target_mcuboot: MCUBoot image upgrade aborted.[0m

Here's the log from the HTTP server.

{"level":"info","ts":1615255361.8753276,"logger":"http.log.access","msg":"handled request","request":{"remote_addr":"52.12.23.139:64562","proto":"HTTP/1.1","method":"GET","host":"pyrinas-dev-ota.jaredwolff.com","uri":"/images/352656102712240.bin","headers":{"Range":["bytes=196608-198655"],"Connection":["keep-alive"]},"tls":{"resumed":false,"version":771,"cipher_suite":49162,"proto":"","proto_mutual":true,"server_name":"pyrinas-dev-ota.jaredwolff.com"}},"common_log":"52.12.23.139 - - [09/Mar/2021:02:02:41 +0000] \"GET /images/352656102712240.bin HTTP/1.1\" 206 2048","duration":0.00488638,"size":2048,"status":206,"resp_headers":{"Accept-Ranges":["bytes"],"Last-Modified":["Tue, 09 Mar 2021 01:50:16 GMT"],"Server":["Caddy"],"Date":["Tue, 09 Mar 2021 02:02:40 GMT"],"Content-Range":["bytes 196608-198655/200595"],"Content-Length":["2048"],"Content-Type":["application/octet-stream"]}}
{"level":"error","ts":1615255362.3557446,"logger":"http.log.access","msg":"handled request","request":{"remote_addr":"52.12.23.139:64562","proto":"HTTP/1.1","method":"GET","host":"pyrinas-dev-ota.jaredwolff.com","uri":"/images/352656102712240.bin","headers":{"Range":["bytes=198656-200595"],"Connection":["keep-alive"]},"tls":{"resumed":false,"version":771,"cipher_suite":49162,"proto":"","proto_mutual":true,"server_name":"pyrinas-dev-ota.jaredwolff.com"}},"common_log":"52.12.23.139 - - [09/Mar/2021:02:02:42 +0000] \"GET /images/352656102712240.bin HTTP/1.1\" 416 0","duration":0.00314682,"size":0,"status":416,"resp_headers":{"Content-Length":["0"],"Date":["Tue, 09 Mar 2021 02:02:42 GMT"],"Server":["Caddy"],"Content-Range":["bytes */200595"]}}

Are there any workarounds for this? I'm downloading a FOTA update so there's a need for the payload size to be fixed. (Currently set to 2048)

Thank you!

Jared

Jared · Accepted Answer

This has been patched in warp . I think is a corner case in the HTTP specification that is not very well defined. It's been working great over the past two months since it was implemented! Here's the PR: github.com/.../818

"Server did not honor partial content request"

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