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Forum Discussion
upload API only works for very small files
Hello,
I try this command from my raspberry pi 2 with raspbian buster:
curl -v -X POST https://content.dropboxapi.com/2/files/upload --header "Authorization: Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...
ags65 We looked into this, and it seems like you may be running in to this issue:
https://www.raspberrypi.org/forums/viewtopic.php?t=223026
As noted there, you can try:
To stop sending DFs, you can change net.ipv4.ip_no_pmtu_disc value to 1 in sysctl.
I would also try reducing the MTU on the interface in order to advertise a smaller MSS to the TCP peer.
Hi,
I sent the very same command from Ubuntu to upload a file of similar size and it works perfectly.
The problem have to be in the raspberry pi system or cURL command version.
I will report any progress I make on this subject.
Thank you very much.
Hi,
Following with the subject, the problem arises when the file size is greater than the mtu (1500 bytes) and cURL send the more than one data packet.
I'm not un expert but what I see in Wireshark is that dropbox answer back the first packet with the ACK but inform parameters SLE and SRE with packets that I dont know what they are.
After that the raspberry try several times the retransmission of the first packet and finally dropbox send the reset that ends the connection
I dont know if someone used to deal with network problems can explain what's happening...
That what I can see is you had send 4 bytes less than Dropbox expects and the confirmations given are for packets that the server doesn't signal for... Bug in the software!
I've compiled in the raspberry pi the same version of cURL that works in my ubuntu (7.65.3) and the problem remains:
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-CHACHA20-POLY1305
* ALPN, server accepted to use http/1.1
* Server certificate:
* subject: C=US; ST=California; L=San Francisco; O=Dropbox, Inc; CN=content.dropboxapi.com
* start date: Jan 29 00:00:00 2020 GMT
* expire date: Mar 2 12:00:00 2022 GMT
* subjectAltName: host "content.dropboxapi.com" matched cert's "content.dropboxapi.com"
* issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=DigiCert SHA2 High Assurance Server CA
* SSL certificate verify ok.
> POST /2/files/upload HTTP/1.1
> Host: content.dropboxapi.com
> User-Agent: curl/7.65.3
> Accept: */*
> Authorization: Bearer xxxxxxxxxxx
> Dropbox-API-Arg: {"path": "/Cromosoma.cc","mode": "add","autorename": true,"mute": false,"strict_conflict": false}
> Content-Type: application/octet-stream
> Content-Length: 2863
> Expect: 100-continue
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 100 Continue
* We are completely uploaded and fine
* Empty reply from server
* Connection #0 to host content.dropboxapi.com left intact
curl: (52) Empty reply from serverHmm... You can try another diagnose way. Check if the transaction completes successfully using something like:
curl -v -X POST https://httpbin.org/post -H "Authorization: Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -H "Dropbox-API-Arg: {\"path\": \"/Cromosoma.cc\",\"mode\": \"add\",\"autorename\": true,\"mute\": false,\"strict_conflict\": false}" -H "Content-Type: application/octet-stream" -H "Expect:" --data-binary @/home/pi/Dropbox-Uploader/Cromosoma.ccThe response would show what actually got send. Evaluate it.
Let's hope result will drive you to the right conclusion.
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