title: Why I got "HTTP error before end of send, stop sending" when post using libCurl
body: <p>I am using the libCurl(7.46) for NDK, when request posting, there is a weird issue about the post content length. When the "CURLINFO_DATA_OUT" exceed some count(1390 bytes get this error, 1333 bytes is OK), I will get the "HTTP error before end of send, stop sending" error.</p>
  
  <p>I am using the curl_formadd to add the post data. What should I do to correct this?</p>