Hi!
  I've googled it before I send this message,but I did'n get the way out.


  Here are some tests. May these tests are not  rigorous, but they can show you 
my question: 
    why can't I get the speed like chrome without proxy set? 


  file size : 93582KB


  Box : https://app.box.com/folder/0


  operating system
     windows server 2008 R2 standard


  Test1:
  
  libcurl 
    compiler: vc=8
    version: 7.57.0
    openssl: 1.0.2n
    zlib: 1.2.11


  case1:
  upload the file to Box, with libcurl: the speed is about 350KB/s;
  I tried the CURL_MAX_WRITE_SIZE: 16384, 32768, 65536, 131072, 262144, 524288, 
1048576


  case2:
  upload the file to Box, with libcurl, set proxy http://127.0.0.1:3213 : the 
acerage speed is about 6MB/s;


  case3:
  upload the file to Box, with chrome, no proxy : the speed is about 6MB/s
  
--------------------------------------------------------------------------------------------------------------------------------


  Test2:


  libcurl-command-line: 
  upload the file to  http://speedtest.tele2.net


  ~~~~~~~~~~~~~~~~~~~ 
\Desktop\libcurl-vc8-x86-release-dll-ssl-dll-zlib-dll-ipv6\
  bin>curl -X POST --proxy http://127.0.0.1:3213  http://speedtest.tele2.net 
--dat
  a-binary @Server.exe -o result.txt
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  
Current
                                                         Dload  Upload   Total  
 Spent    Left  Speed
   100 91.3M    0  8140  100 91.3M    508  5848k  0:00:16  0:00:16 --:--:-- 
10.8M


   ~~~~~~~~~~~~~~~~~~~ 
\Desktop\libcurl-vc8-x86-release-dll-ssl-dll-zlib-dll-ipv6\
  bin>curl -X POST  http://speedtest.tele2.net --data-binary @Server.exe -o resu
  lt.txt
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  
Current
                                              Dload  Upload   Total   Spent    
Left  Speed
  100 91.3M    0  8141  100 91.3M     30   355k  0:04:23  0:04:23 --:--:--  345k
  
--------------------------------------------------------------------------------------------------------------------------------------


  Test3:


  curl: download from https://curl.haxx.se/download.html 
    version: Win64 x86_64 7zip7.57.0binarySSLSSHViktor Szakáts1.88 MB


  the speed upload to Box is same as libcurl;


  other cases: upload the file to  http://speedtest.tele2.net


  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\curl-7.57.0-win64-mingw\curl-7.57.0-wi
  n64-mingw\bin>curl -X POST --proxy http://127.0.0.1:3213  
http://speedtest.tele2
  .net --data-binary @ABServer.exe -o result.txt
     % Total    % Received % Xferd  Average Speed   Time    Time     Time  
Current
                                                          Dload  Upload   Total 
  Spent    Left  Speed
   100 91.3M    0  8140  100 91.3M    542  6238k  0:00:15  0:00:15 --:--:-- 
11.6M


  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~curl-7.57.0-win64-mingw\curl-7.57.0-wi
  n64-mingw\bin>curl -X POST  http://speedtest.tele2.net --data-binary 
@ABServer.e
  xe -o result.txt
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  
Current
                                                         Dload  Upload   Total  
 Spent    Left  Speed
  100 91.3M    0  8141  100 91.3M     29   335k  0:04:39  0:04:39 --:--:--  317k
--------------------------------------------------------------------------------------------------------------------------------------------------
  
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