I encounter a problem with NetScape browser. I use doGet method in servlet A to output a page P1, let user enter some of data on that page and submit tnem. I use doPost method in servlet A to handle these data and then use RequestDispatcher to call doGet method in another servlet B and output a page P2. Click anyone of links on Page P2, then click Back button of NetScape browser, get error "Data missing". It means can not back to P2 again. But It is OK if I use IE browser.