Line 93 in http.h:
	Http& operator()(const char *id, const char *v)   { var.GetAdd(id) = v; return *this; }
	Http& operator()(const char *id, const String& v) { var.GetAdd(id) = v; return *this; }
	Http& operator()(const char *id, const Value& v)  { var.GetAdd(id) = v; return *this; }