public void RemoveHead(string key)
{
if (ContentHeads.ContainsKey(key))
{
ContentHeads.Remove(key);
}
}
public void AddHead(string key, string value)
{
if (!ContentHeads.ContainsKey(key))
{
ContentHeads.Add(key, value);
}
else
{
ContentHeads[key] = value;
}
}