On Mon, 8 May 2017, Pahome Chen wrote:

> I thought the curl_slist_append will append headers to freed list. so it
> needs to points to NULL again if I want to reuse?

Please stop top-posting.

If you free the slist and then try to append headers to that freed list, you
will most likely get a crash or some other memory related problems, much in
the same way you can't work on memory you free()d already.

If you pass in a NULL pointer as the first argument to curl_slist_append, it
will create/malloc a new list to work on.

-- 
  / daniel.haxx.se
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