code: public ArrayList<Pair<String, String>> extraHeaders() {
          string_string_pair_vector v = e.getExtra_headers();
          int size = (int) v.size();
  
          ArrayList<Pair<String, String>> l = new ArrayList<>(size);
          for (int i = 0; i < size; i++) {
              string_string_pair p = v.get(i);
              l.add(new Pair<>(p.getFirst(), p.getSecond()));
          }
  
          return l;
      }
docs: Any extra HTTP headers that need to be passed to the web seed.
  
  @return