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 Szak¨¢ts1.88 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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Received on 2018-01-03