@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((extraHeaders == null) ? 0 : extraHeaders.hashCode());
result = prime * result + ((from == null) ? 0 : from.hashCode());
result = prime * result + ((id == null) ? 0 : id.hashCode());
result = prime * result + ((to == null) ? 0 : to.hashCode());
return result;
}
