message: curl_wrapper: add comment for 'Expect:' upload header
diff: @@ -86,6 +86,8 @@ bool CurlWrapper::upload_file(const std::string &url, const std::string &path, c
  curl_httppost *last = NULL;
  struct curl_slist *chunk = NULL;
  +
  + // avoid sending 'Expect: 100-Continue' header, required by some server implementations
  chunk = curl_slist_append(chunk, "Expect:");
  curl_formadd(&post, &last,
  