public void setRequestProperty(String key, String value) { req_props.put(key.toLowerCase(), value); }
public void setRequestProperty(String key, String value) { if (connected) throw new IllegalStateException("Already connected");  if (key == null) throw new NullPointerException("key is null");    }
	public void setRequestProperty(String key, String value) {		req_props.put(key.toLowerCase(), value);	}