How to refresh Client only once by sending setHeader ("refresh" ,??? )

How can i send response from JSP that will make my client page to be refreshed ?? I just want to refresh my client page only once....! Not periodically....!

Actually i am calling a page that check for flag value in model through JSP page. And if it find flag value 1 in model it will tell Browser for RELOAD / REFRESH ....!

I want to reload Client side only once when some event occur and flag is changed.

Anticipating for quick response...!

Thanks...!