Adds a header value. The header named name will have the value
value added to its list of values. Some headers are single
valued, and for these adding a value will replace the previous
value. If the value is of type DateTime a HTTP date format will be
applied. If the value is a List each element of the list will
be added separately. For all other types the default toString
method will be used.
Source
void add(String name, Object value);