Function http_guest::hostcalls::raw::hostcall_req_set_header

pub unsafe extern "C" fn hostcall_req_set_header(
    req: i32, 
    name_ptr: *const u8, 
    name_len: usize, 
    values_slice_ptr: *const GuestSlice<u8>, 
    values_slice_len: usize
) -> HostcallStatus