What are the way to avoid http service error in flex?

In my project used quick search for charact开发者_运维百科er based send request to server , But on time the user fastly type then i got http service error So i want to know how avoid that problem or any possiable to avoid continue request to server or any message queue technical for that problem . kindly give suggestion it's helpful to all

If there is a typing delay greater that X milliseconds (e.g. 500), send the request.