forward() method of RequestDispatcher vs sendRedirect() on Response object

can anybody tell me the difference between
. forward() method of RequestDispatcher object
. sendRedirect() on Response object

I think that sendRedirect creates a new request, with a new header,
whereas forward keeps on using the same request.

1) forward() is a server-side redirect. url on the browser doesn't change.
2) sendRedirect() happens on the client-side i.e server sends a redirect url to a client status of http 301 and the url on the browser changes to the redirected value.

forward() method of RequestDispatcher is a server side activity. So the request and its associated session are available to the forwarded resource.This method is normally used for sending a request and response object to resources (servlets or JSP's)which are in the same ServletContext.

sendRedirect() method of a response object sends the url(parameter of sendRedirect() method) to the browser and the browser sends a new request to that url. sendRedirect() used to forward requests to a resource which is outside of the current web application. It is like ,opening a new browser and type your url.

correct me if i am wrong.

Request parameters and request attributes are NOT preserved with sendRedirct.

The client browser makes a automatic request on the URL specified in the redirect(301) response header. You can see the change in the request URL in the browser

When we use forward() or include() methods ,Can we pass custom(after change) request and response objects to forwarded or included resource?

Yes you can. You can add Query strings at the end of the resource name to which the request is forwarded.

One more addition, i guess that with RequestDispatcher we cannot redirect to a resource that is in a different context, while with redirect we can.

Can u guys confirm the same

RequestDispatcher in ServletContext can be used to dispatch the request to a different context.

Take a look at this method too in ServletContext.

getContext(String uripath)