TLS1.1 and TLS 1.2 not support on Windows XP.

[jashking]

In the http_client_winhttp.cpp

BOOL win32_result(FALSE);

DWORD secure_protocols(WINHTTP_FLAG_SECURE_PROTOCOL_SSL3 | WINHTTP_FLAG_SECURE_PROTOCOL_TLS1 | WINHTTP_FLAG_SECURE_PROTOCOL_TLS1_1 | WINHTTP_FLAG_SECURE_PROTOCOL_TLS1_2);
win32_result = ::WinHttpSetOption(m_hSession, WINHTTP_OPTION_SECURE_PROTOCOLS, &secure_protocols, sizeof(secure_protocols));
if(FALSE == win32_result)
{
    return report_failure(_XPLATSTR("Error setting session options"));
}

There will failed on Windows XP because TLS1.1 and TLS 1.2 not support on Windows XP.

[ras0219-msft]

Thanks for reporting this issue!