Only Fiddler fixes my WININET GET request - c++

Question

I need to send WININET request to rest server and get json response. Code works only while fiddler is working. I've tried everything what I've found but every time I get 0 into bytesRead. There aren't any errors and HttpSendRequestand and InternetReadFile both return true but buffer is still empty.
Server works fine and answers in a right way. When fiddler is running I get my 76 bytes, which I need. I tried to figure out using that blog Help! Running Fiddler Fixes My App???, no luck.
HINTERNET session = nullptr;
HINTERNET request = nullptr;
HINTERNET connect = nullptr;
BOOST_SCOPE_EXIT((&session)(&request)(&connect)) {
if (request != nullptr)
::InternetCloseHandle(request);
if (session != nullptr)
::InternetCloseHandle(session);
if (connect != nullptr)
::InternetCloseHandle(connect);
} BOOST_SCOPE_EXIT_END;
try
{
//std::wstring agent(L"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1");
std::wstring agent{ L"Mozilla/5.0 (compatible)" };
session = ::InternetOpen(agent.c_str(), INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
if (!session)
return;
InternetSetStatusCallback(
session,
(INTERNET_STATUS_CALLBACK)IStatusCallback);
connect = InternetConnect(
session
, serverName.c_str()
, INTERNET_DEFAULT_HTTP_PORT
, NULL
, NULL
, INTERNET_SERVICE_HTTP
, 0
, 1);
if (!connect)
return;
//const wchar_t* parrAcceptTypes[] = { L"text/*", NULL };
const wchar_t* parrAcceptTypes[] = { L"application/json", L"text/*", NULL };
request = HttpOpenRequest(
connect
, L"GET"
, virtualFolder.c_str()
, L"HTTP/1.1"
, NULL
, parrAcceptTypes
, /*INTERNET_FLAG_KEEP_CONNECTION*/INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_PRAGMA_NOCACHE
, 1);
std::string data;
if (request)
{
BOOL isRequestComplete = HttpSendRequest(request, NULL, 0, NULL, 0);
if (isRequestComplete)
{
const int dataSize = 1024;
BYTE buff[dataSize];
DWORD bytesRead = (DWORD)-1;
BOOL bKeepReading = true;
while (bKeepReading && bytesRead != 0)
{
bKeepReading = InternetReadFile(request, buff, sizeof(buff) - 1, &bytesRead);
data.append((char*)buff, bytesRead);
}
}
else
{
DWORD dwErr = GetLastError();
InternetErrorDlg(parent_, request, dwErr, 0, NULL);
LERR_ << "Request was failed. Error code: " << dwErr;
}
}