curl_mime_data does not change Content-Length when change data after perform #1999

moteus opened this Issue Oct 19, 2017 · 2 comments


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moteus commented Oct 19, 2017

I did this

I create mime with simple text then I did perform and curl correcly send data.
After that I change data in text part but when I did perform again curl
send Content-Length for first data. If I change data without doing perform then
curl send correct Content-Length. This is my snippet on Lua, but I think
it quite easy to understand.

local easy = curl.easy()
local mime = easy:mime()

  url            = "";
  customrequest  = "GET";
  mimepost       = mime;
  writefunction  = function()end;

local part = mime:addpart()

easy:perform() -- here curl send Conten-Length: 136 (which is correct)

easy:perform() -- here curl send same Conten-Length: 136 but data size is 130

I expected the following

I expected that curl send correct Content-Length

curl/libcurl version

libcurl/7.56.0 WinSSL

operating system

Windows 7 x64


monnerat commented Oct 20, 2017

Many tanks for the report: the bug is confirmed.
I will produce a fix and a test case in the next hours.

@monnerat monnerat closed this in cea27d3 Oct 20, 2017

monnerat added a commit that referenced this issue Oct 20, 2017


monnerat commented Oct 20, 2017

Fix pushed: cea27d3
Test for this case: 8351ab4

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