pub unsafe fn WinHttpOpen<P0, P1, P2>(
    pszagentw: P0,
    dwaccesstype: WINHTTP_ACCESS_TYPE,
    pszproxyw: P1,
    pszproxybypassw: P2,
    dwflags: u32
) -> *mut c_void
where P0: IntoParam<PCWSTR>, P1: IntoParam<PCWSTR>, P2: IntoParam<PCWSTR>,