Question - What do you mean by ‘filtering’ in servlets?
Answer -
There are usually 2 ways during which one will trigger a series of servlets for an associate incoming request. In the first manner, it is such that the server that bound URLs ought to be handled with the associated specified chain. the other manner is that one will inform the server to redirect all the output of a selected content through a selected servlet before it's returned to the client. This effectively creates a series on the fly. once a servlet transforms one sort of content into another, this method is named filtering.