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    <title>topic Re: upload API only works for very small files in Dropbox API Support &amp; Feedback</title>
    <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400899#M21941</link>
    <description>&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;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.&lt;/P&gt;&lt;P&gt;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.&lt;/P&gt;&lt;P&gt;After that the raspberry try several times the retransmission of the first packet and finally dropbox send the reset that ends the connection&lt;/P&gt;&lt;P&gt;I dont know if someone used to deal with network problems can explain what's happening...&lt;/P&gt;&lt;P&gt;&lt;IMG src="https://www.dropboxforum.com/t5/image/serverpage/image-id/14244iCFEE9BC814B52D92/image-size/original?v=1.0&amp;amp;px=-1" alt="tcpdump.PNG" title="tcpdump.PNG" border="0" /&gt;&lt;/P&gt;</description>
    <pubDate>Thu, 05 Mar 2020 17:28:36 GMT</pubDate>
    <dc:creator>ags65</dc:creator>
    <dc:date>2020-03-05T17:28:36Z</dc:date>
    <item>
      <title>upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400035#M21898</link>
      <description>&lt;P&gt;Hello,&lt;/P&gt;
&lt;P&gt;I try this command from my raspberry pi 2 with raspbian buster:&lt;/P&gt;
&lt;P&gt;curl -v -X POST &lt;A href="https://content.dropboxapi.com/2/files/upload" target="_blank" rel="noopener"&gt;https://content.dropboxapi.com/2/files/upload&lt;/A&gt; --header "Authorization: Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" --header "Dropbox-API-Arg: {\"path\": \"/README.md\",\"mode\": \"add\",\"autorename\": true,\"mute\": false,\"strict_conflict\": false}" --header "Content-Type: application/octet-stream" --data-binary @/home/pi/Dropbox-Uploader/README.md&lt;/P&gt;
&lt;P&gt;and I get the error 52 Empty reply from server:&lt;/P&gt;
&lt;P&gt;&amp;gt; POST /2/files/upload HTTP/1.1&lt;BR /&gt;&amp;gt; Host: content.dropboxapi.com&lt;BR /&gt;&amp;gt; User-Agent: curl/7.64.0&lt;BR /&gt;&amp;gt; Accept: */*&lt;BR /&gt;&amp;gt; Authorization: Bearer xxxxxxxxx&lt;BR /&gt;&amp;gt; Dropbox-API-Arg: {"path": "/README.md","mode": "add","autorename": true,"mute": false,"strict_conflict": false}&lt;BR /&gt;&amp;gt; Content-Type: application/octet-stream&lt;BR /&gt;&amp;gt; Content-Length: 8900&lt;BR /&gt;&amp;gt; Expect: 100-continue&lt;BR /&gt;&amp;gt;&lt;BR /&gt;* Expire in 1000 ms for 0 (transfer 0x1679880)&lt;BR /&gt;&amp;lt; HTTP/1.1 100 Continue&lt;BR /&gt;* We are completely uploaded and fine&lt;BR /&gt;* Empty reply from server&lt;BR /&gt;* Connection #0 to host content.dropboxapi.com left intact&lt;BR /&gt;curl: (52) Empty reply from server&lt;/P&gt;
&lt;P&gt;but the same command with a very small file works:&lt;/P&gt;
&lt;P&gt;&amp;gt; POST /2/files/upload HTTP/1.1&lt;BR /&gt;&amp;gt; Host: content.dropboxapi.com&lt;BR /&gt;&amp;gt; User-Agent: curl/7.64.0&lt;BR /&gt;&amp;gt; Accept: */*&lt;BR /&gt;&amp;gt; Authorization: Bearer xxxxxxxxxxxx&lt;BR /&gt;&amp;gt; Dropbox-API-Arg: {"path": "/borrar.txt","mode": "add","autorename": true,"mute": false,"strict_conflict": false}&lt;BR /&gt;&amp;gt; Content-Type: application/octet-stream&lt;BR /&gt;&amp;gt; Content-Length: 5&lt;BR /&gt;&amp;gt;&lt;BR /&gt;* upload completely sent off: 5 out of 5 bytes&lt;BR /&gt;&amp;lt; HTTP/1.1 200 OK&lt;BR /&gt;&amp;lt; Server: nginx&lt;BR /&gt;&amp;lt; Date: Sun, 01 Mar 2020 18:54:34 GMT&lt;BR /&gt;&amp;lt; Content-Type: application/json&lt;BR /&gt;&amp;lt; Transfer-Encoding: chunked&lt;BR /&gt;&amp;lt; Connection: keep-alive&lt;BR /&gt;&amp;lt; Vary: Accept-Encoding&lt;BR /&gt;&amp;lt; cache-control: no-cache&lt;BR /&gt;&amp;lt; pragma: no-cache&lt;BR /&gt;&amp;lt; X-Server-Response-Time: 823&lt;BR /&gt;&amp;lt; X-Dropbox-Request-Id: 6a837c20651b6d6f2f6498f45e297b3f&lt;BR /&gt;&amp;lt; X-Robots-Tag: noindex, nofollow, noimageindex&lt;BR /&gt;&amp;lt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;Thanks for any clue you can give me to help me.&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Mon, 02 Mar 2020 07:03:51 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400035#M21898</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-02T07:03:51Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400056#M21899</link>
      <description>&lt;P&gt;Hi &lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/1268788"&gt;@ags65&lt;/a&gt;,&lt;/P&gt;&lt;P&gt;That's a old curl feature currently almost deprecated. The idea is when relatively big file have to be passed, credentials to be check in advance, so prevents get notification for invalid credentials after passing everything. Generally something useful. But seems your curl version doesn't behave as expected. Actual files data have to be passed after the confirmation, but seems passed before that. Probably your network connection is very slow and that's why response delay is more than 1 second (the default threshold). You can try set this threshold to something appropriate in your case or try disable this check by explicitly set "Expect" header with empty value, for example. &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@F55D1311E4D274BF094217A54A6087D3/images/emoticons/1f609.png" alt=":wink:" title=":wink:" /&gt;&lt;/P&gt;&lt;P&gt;Hope this gives the right direction.&lt;/P&gt;</description>
      <pubDate>Sun, 01 Mar 2020 23:07:25 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400056#M21899</guid>
      <dc:creator>Здравко</dc:creator>
      <dc:date>2020-03-01T23:07:25Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400087#M21902</link>
      <description>&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;Thank you very much for your help, but the problem persists:&lt;/P&gt;&lt;P&gt;my network connection is fast, &lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;the raspberry pi is connected by ethernet cable to the router and my internet connection works with optic fibre cable.&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;cURL version is the last in raspbian: 7.64.0&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;the cURL command with option -H 'Expect:' does not send the "Expect: 100-continue" to dropbox but directly send the file. But the error is the same:&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;&amp;gt; POST /2/files/upload HTTP/1.1&lt;BR /&gt;&amp;gt; Host: content.dropboxapi.com&lt;BR /&gt;&amp;gt; User-Agent: curl/7.64.0&lt;BR /&gt;&amp;gt; Accept: */*&lt;BR /&gt;&amp;gt; Authorization: Bearer xxxxxxx&lt;BR /&gt;&amp;gt; Dropbox-API-Arg: {"path": "/README.md","mode": "add","autorename": true,"mute": false,"strict_conflict": false}&lt;BR /&gt;&amp;gt; Content-Type: application/octet-stream&lt;BR /&gt;&amp;gt; Content-Length: 8900&lt;BR /&gt;&amp;gt;&lt;BR /&gt;* upload completely sent off: 8900 out of 8900 bytes&lt;BR /&gt;* TLSv1.2 (IN), TLS alert, close notify (256):&lt;BR /&gt;* Empty reply from server&lt;BR /&gt;* Connection #0 to host content.dropboxapi.com left intact&lt;BR /&gt;curl: (52) Empty reply from server&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;If there is a problem in my system, why it does not affect with small files to upload ?&lt;/P&gt;&lt;P&gt;From dropbox, is there a way to see the log of &lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;connection attempts?&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;Thank you for your help&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Mon, 02 Mar 2020 07:57:15 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400087#M21902</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-02T07:57:15Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400198#M21904</link>
      <description>&lt;P&gt;Wow... That's strange. &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@86FF27E33EE6AE58E01795BD66324A7F/images/emoticons/1f914.png" alt=":thinking:" title=":thinking:" /&gt;&lt;/P&gt;&lt;P&gt;Make your own investigation, what's going on. Try crosscompile working desktop version and see if the behaviour changes. If I'm in your shoes, this would be the first check. Try if same file transfer gonna completes on desktop version.&lt;/P&gt;</description>
      <pubDate>Mon, 02 Mar 2020 16:54:32 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400198#M21904</guid>
      <dc:creator>Здравко</dc:creator>
      <dc:date>2020-03-02T16:54:32Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400282#M21909</link>
      <description>&lt;P&gt;&lt;SPAN&gt;We're not currently experiencing any known service disruption that would cause empty replies from the Dropbox API. Might there be something on your network connection preventing your app from connecting to the Dropbox servers? For example, might there be some firewall, proxy, or caching layer that is either blocking or failing on larger requests?&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Mon, 02 Mar 2020 23:12:23 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400282#M21909</guid>
      <dc:creator>Greg-DB</dc:creator>
      <dc:date>2020-03-02T23:12:23Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400323#M21912</link>
      <description>&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;I sent the very same command from Ubuntu to upload a file of similar size and it works perfectly.&lt;/P&gt;&lt;P&gt;The problem have to be in the raspberry pi system or cURL command version.&lt;/P&gt;&lt;P&gt;&lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;I will report any progress I make on this subject&lt;/SPAN&gt;&lt;/SPAN&gt;.&lt;/P&gt;&lt;P&gt;Thank you very much.&lt;/P&gt;</description>
      <pubDate>Tue, 03 Mar 2020 07:35:59 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400323#M21912</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-03T07:35:59Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400899#M21941</link>
      <description>&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;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.&lt;/P&gt;&lt;P&gt;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.&lt;/P&gt;&lt;P&gt;After that the raspberry try several times the retransmission of the first packet and finally dropbox send the reset that ends the connection&lt;/P&gt;&lt;P&gt;I dont know if someone used to deal with network problems can explain what's happening...&lt;/P&gt;&lt;P&gt;&lt;IMG src="https://www.dropboxforum.com/t5/image/serverpage/image-id/14244iCFEE9BC814B52D92/image-size/original?v=1.0&amp;amp;px=-1" alt="tcpdump.PNG" title="tcpdump.PNG" border="0" /&gt;&lt;/P&gt;</description>
      <pubDate>Thu, 05 Mar 2020 17:28:36 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400899#M21941</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-05T17:28:36Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400911#M21944</link>
      <description>&lt;P&gt;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!&lt;/P&gt;</description>
      <pubDate>Thu, 05 Mar 2020 18:03:50 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/400911#M21944</guid>
      <dc:creator>Здравко</dc:creator>
      <dc:date>2020-03-05T18:03:50Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401047#M21953</link>
      <description>&lt;P&gt;I've compiled in the raspberry pi the same version of cURL that works in my ubuntu (7.65.3)&amp;nbsp; and the problem remains:&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;* TLSv1.2 (OUT), TLS handshake, Client hello (1):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Server hello (2):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Certificate (11):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Server key exchange (12):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Server finished (14):&lt;BR /&gt;* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):&lt;BR /&gt;* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):&lt;BR /&gt;* TLSv1.2 (OUT), TLS handshake, Finished (20):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Finished (20):&lt;BR /&gt;* SSL connection using TLSv1.2 / ECDHE-RSA-CHACHA20-POLY1305&lt;BR /&gt;* ALPN, server accepted to use http/1.1&lt;BR /&gt;* Server certificate:&lt;BR /&gt;* subject: C=US; ST=California; L=San Francisco; O=Dropbox, Inc; CN=content.dropboxapi.com&lt;BR /&gt;* start date: Jan 29 00:00:00 2020 GMT&lt;BR /&gt;* expire date: Mar 2 12:00:00 2022 GMT&lt;BR /&gt;* subjectAltName: host "content.dropboxapi.com" matched cert's "content.dropboxapi.com"&lt;BR /&gt;* issuer: C=US; O=DigiCert Inc; OU=&lt;A href="http://www.digicert.com" target="_blank"&gt;www.digicert.com&lt;/A&gt;; CN=DigiCert SHA2 High Assurance Server CA&lt;BR /&gt;* SSL certificate verify ok.&lt;BR /&gt;&amp;gt; POST /2/files/upload HTTP/1.1&lt;BR /&gt;&amp;gt; Host: content.dropboxapi.com&lt;BR /&gt;&amp;gt; User-Agent: curl/7.65.3&lt;BR /&gt;&amp;gt; Accept: */*&lt;BR /&gt;&amp;gt; Authorization: Bearer xxxxxxxxxxx&lt;BR /&gt;&amp;gt; Dropbox-API-Arg: {"path": "/Cromosoma.cc","mode": "add","autorename": true,"mute": false,"strict_conflict": false}&lt;BR /&gt;&amp;gt; Content-Type: application/octet-stream&lt;BR /&gt;&amp;gt; Content-Length: 2863&lt;BR /&gt;&amp;gt; Expect: 100-continue&lt;BR /&gt;&amp;gt;&lt;BR /&gt;* Mark bundle as not supporting multiuse&lt;BR /&gt;&amp;lt; HTTP/1.1 100 Continue&lt;BR /&gt;* We are completely uploaded and fine&lt;BR /&gt;* Empty reply from server&lt;BR /&gt;* Connection #0 to host content.dropboxapi.com left intact&lt;BR /&gt;curl: (52) Empty reply from server&lt;/P&gt;</description>
      <pubDate>Fri, 06 Mar 2020 08:48:17 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401047#M21953</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-06T08:48:17Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401101#M21955</link>
      <description>&lt;P&gt;Hmm... You can try another diagnose way. Check if the transaction completes successfully using something like:&lt;/P&gt;&lt;PRE&gt;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.cc&lt;/PRE&gt;&lt;P&gt;The response would show what actually got send. Evaluate it.&lt;/P&gt;&lt;P&gt;Let's hope result will drive you to the right conclusion.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Fri, 06 Mar 2020 13:36:48 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401101#M21955</guid>
      <dc:creator>Здравко</dc:creator>
      <dc:date>2020-03-06T13:36:48Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401141#M21957</link>
      <description>&lt;P&gt;interesting...&lt;/P&gt;&lt;P&gt;the cURL command works in httpbin.org and the data seems to be OK:&lt;/P&gt;&lt;P&gt;Note: Unnecessary use of -X or --request, POST is already inferred.&lt;BR /&gt;* Trying 34.230.193.231:443...&lt;BR /&gt;* TCP_NODELAY set&lt;BR /&gt;* Connected to httpbin.org (34.230.193.231) port 443 (#0)&lt;BR /&gt;* ALPN, offering http/1.1&lt;BR /&gt;* successfully set certificate verify locations:&lt;BR /&gt;* CAfile: /etc/ssl/certs/ca-certificates.crt&lt;BR /&gt;CApath: none&lt;BR /&gt;* TLSv1.3 (OUT), TLS handshake, Client hello (1):&lt;BR /&gt;* TLSv1.3 (IN), TLS handshake, Server hello (2):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Certificate (11):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Server key exchange (12):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Server finished (14):&lt;BR /&gt;* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):&lt;BR /&gt;* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):&lt;BR /&gt;* TLSv1.2 (OUT), TLS handshake, Finished (20):&lt;BR /&gt;* TLSv1.2 (IN), TLS handshake, Finished (20):&lt;BR /&gt;* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256&lt;BR /&gt;* ALPN, server accepted to use http/1.1&lt;BR /&gt;* Server certificate:&lt;BR /&gt;* subject: CN=httpbin.org&lt;BR /&gt;* start date: Jan 18 00:00:00 2020 GMT&lt;BR /&gt;* expire date: Feb 18 12:00:00 2021 GMT&lt;BR /&gt;* subjectAltName: host "httpbin.org" matched cert's "httpbin.org"&lt;BR /&gt;* issuer: C=US; O=Amazon; OU=Server CA 1B; CN=Amazon&lt;BR /&gt;* SSL certificate verify ok.&lt;BR /&gt;&amp;gt; POST /post HTTP/1.1&lt;BR /&gt;&amp;gt; Host: httpbin.org&lt;BR /&gt;&amp;gt; User-Agent: curl/7.65.3&lt;BR /&gt;&amp;gt; Accept: */*&lt;BR /&gt;&amp;gt; Authorization: Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&lt;BR /&gt;&amp;gt; Dropbox-API-Arg: {"path": "/Cromosoma.cc","mode": "add","autorename": true,"mute": false,"strict_conflict": false}&lt;BR /&gt;&amp;gt; Content-Type: application/octet-stream&lt;BR /&gt;&amp;gt; Content-Length: 2863&lt;BR /&gt;&amp;gt;&lt;BR /&gt;* upload completely sent off: 2863 out of 2863 bytes&lt;BR /&gt;* Mark bundle as not supporting multiuse&lt;BR /&gt;&amp;lt; HTTP/1.1 200 OK&lt;BR /&gt;&amp;lt; Date: Fri, 06 Mar 2020 16:28:55 GMT&lt;BR /&gt;&amp;lt; Content-Type: application/json&lt;BR /&gt;&amp;lt; Content-Length: 4463&lt;BR /&gt;&amp;lt; Connection: keep-alive&lt;BR /&gt;&amp;lt; Server: gunicorn/19.9.0&lt;BR /&gt;&amp;lt; Access-Control-Allow-Origin: *&lt;BR /&gt;&amp;lt; Access-Control-Allow-Credentials: true&lt;BR /&gt;&amp;lt;&lt;BR /&gt;{&lt;BR /&gt;"args": {},&lt;BR /&gt;"data": "data&amp;amp;colon;application/octet-stream;base64,LyoqIEBma............g==",&lt;BR /&gt;"files": {},&lt;BR /&gt;"form": {},&lt;BR /&gt;"headers": {&lt;BR /&gt;"Accept": "*/*",&lt;BR /&gt;"Authorization": "Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",&lt;BR /&gt;"Content-Length": "2863",&lt;BR /&gt;"Content-Type": "application/octet-stream",&lt;BR /&gt;"Dropbox-Api-Arg": "{\"path\": \"/Cromosoma.cc\",\"mode\": \"add\",\"autorename\": true,\"mute\": false,\"strict_conflict\": false}",&lt;BR /&gt;"Host": "httpbin.org",&lt;BR /&gt;"User-Agent": "curl/7.65.3",&lt;BR /&gt;"X-Amzn-Trace-Id": "Root=1-5e627a47-49885dec98b9e392fb837b9a"&lt;BR /&gt;},&lt;BR /&gt;"json": null,&lt;BR /&gt;"origin": "83.47.100.114",&lt;BR /&gt;"url": "&lt;A href="https://httpbin.org/post" target="_blank"&gt;https://httpbin.org/post&lt;/A&gt;"&lt;BR /&gt;}&lt;BR /&gt;* Connection #0 to host httpbin.org left intact&lt;/P&gt;</description>
      <pubDate>Fri, 06 Mar 2020 16:51:11 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401141#M21957</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-06T16:51:11Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401148#M21958</link>
      <description>&lt;P&gt;Wow... If content of 'data' field match exactly to the posted file... hands up... I haven't more ideas. Isn't there something missing at the end? The content there is JSON-ASCII encoded! Decode it before compare if need (or opposite). For example, encode the file you passed using:&lt;/P&gt;&lt;PRE&gt;python3 -c "import json;import sys;f=open(sys.argv[1],'r');print(json.dumps(f.read()));f.close()" /home/pi/Dropbox-Uploader/Cromosoma.cc&lt;/PRE&gt;&lt;P&gt;And compare the result to 'data' field content above.&lt;/P&gt;</description>
      <pubDate>Fri, 06 Mar 2020 17:57:07 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401148#M21958</guid>
      <dc:creator>Здравко</dc:creator>
      <dc:date>2020-03-06T17:57:07Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401167#M21962</link>
      <description>&lt;P&gt;Yes, the content of "data" field match to the file:&lt;/P&gt;&lt;P&gt;&lt;A href="https://httpbin.org" target="_blank"&gt;https://httpbin.org&lt;/A&gt;:&lt;/P&gt;&lt;PRE&gt; "data": "/** @file Cromosoma.cc\n    @brie...... &amp;lt;&amp;lt; crom[i];\n    }\n    cout &amp;lt;&amp;lt; endl;\n}\n",&lt;/PRE&gt;&lt;P&gt;print(json.dumps):&lt;/P&gt;&lt;PRE&gt;"/** @file Cromosoma.cc\n    @brie...... &amp;lt;&amp;lt; crom[i];\n    }\n    cout &amp;lt;&amp;lt; endl;\n}\n"&lt;/PRE&gt;&lt;P&gt;no missing characters at the end.&lt;/P&gt;</description>
      <pubDate>Fri, 06 Mar 2020 20:08:35 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401167#M21962</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-06T20:08:35Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401175#M21963</link>
      <description>&lt;P&gt;I'm up to here. Probably &lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/10"&gt;@Greg-DB&lt;/a&gt; can propose some additional checks.&lt;/P&gt;</description>
      <pubDate>Fri, 06 Mar 2020 20:47:55 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401175#M21963</guid>
      <dc:creator>Здравко</dc:creator>
      <dc:date>2020-03-06T20:47:55Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401575#M21966</link>
      <description>&lt;P&gt;Unfortunately I don't know what the issue may be here. We'll try to look into it, but I can't make any promises as it seems to be client-specific, based on the observation that it doesn't occur on your other computer.&lt;/P&gt;</description>
      <pubDate>Mon, 09 Mar 2020 16:22:03 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401575#M21966</guid>
      <dc:creator>Greg-DB</dc:creator>
      <dc:date>2020-03-09T16:22:03Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401616#M21971</link>
      <description>&lt;P&gt;Thank you Greg, I understand.&lt;/P&gt;&lt;P&gt;&lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;I will communicate if I make new advances&lt;/SPAN&gt;&lt;/SPAN&gt;.&lt;/P&gt;</description>
      <pubDate>Mon, 09 Mar 2020 20:10:30 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401616#M21971</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-09T20:10:30Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401626#M21972</link>
      <description>&lt;P&gt;&lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/1268788"&gt;@ags65&lt;/a&gt;&amp;nbsp;We looked into this, and it seems like you may be running in to this issue:&lt;/P&gt;
&lt;P&gt;&lt;A href="https://www.raspberrypi.org/forums/viewtopic.php?t=223026" target="_self"&gt;https://www.raspberrypi.org/forums/viewtopic.php?t=223026&lt;/A&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN&gt;As noted there, you can try:&lt;/SPAN&gt;&lt;/P&gt;
&lt;BLOCKQUOTE&gt;
&lt;P&gt;&lt;SPAN&gt;To stop sending DFs, you can change net.ipv4.ip_no_pmtu_disc value to 1 in sysctl.&lt;/SPAN&gt;&lt;BR /&gt;&lt;SPAN&gt;I would also try reducing the MTU on the interface in order to advertise a smaller MSS to the TCP peer.&lt;/SPAN&gt;&lt;/P&gt;
&lt;/BLOCKQUOTE&gt;</description>
      <pubDate>Mon, 09 Mar 2020 21:03:35 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401626#M21972</guid>
      <dc:creator>Greg-DB</dc:creator>
      <dc:date>2020-03-09T21:03:35Z</dc:date>
    </item>
    <item>
      <title>Re: upload API only works for very small files</title>
      <link>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401679#M21974</link>
      <description>&lt;P&gt;Amazing, now it works !!!&lt;/P&gt;&lt;P&gt;The parameter ip_no_pmtu_disc does not seem to influence but I have lowered the value of the MTU from 1500 to 1200 and now the uploads work without problems&lt;/P&gt;&lt;P&gt;&lt;SPAN class="tlid-translation translation"&gt;&lt;SPAN class=""&gt;Thank you very much to both of you.&lt;/SPAN&gt;&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Tue, 10 Mar 2020 10:05:06 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/upload-API-only-works-for-very-small-files/m-p/401679#M21974</guid>
      <dc:creator>ags65</dc:creator>
      <dc:date>2020-03-10T10:05:06Z</dc:date>
    </item>
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