sendRedirect is an HTTP thing - it doesn't have to be a servlet
either redirecting, or being redirected to, the sendRedirect
method just makes it easy for us to use the HTTP redirect facility
without playing about with headers ourselves. If I'm remembering
my HTTP correctly, a redirect response code is sent to the browser
which then requests the page the redirect pointed it towards.
RequestDispatcher is a Servlet thing where one servlet passes
everything onto another servlet to help/deal with - the browser
will know nothing about it.
Catherine
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