HTTPClient http;
http.begin("http://server.com/url");
code = http.POST(PostData);
Serial.printf("[HTTP] POST... code: %d\r\n", code);
res = http.getString();

Variable res now contains the webpage, but how do I read the returned headers?
(specifically the Set-Cookie?)

I have tried combinations of http.collectHeaders(), http.headers(), http.headerName(), etc...