What is the difference between forward() and sendRedirect()?

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In servlets, forward() and sendRedirect() are used to transfer control to another resource, but they work differently.

1. forward() (RequestDispatcher):

  • Executed on the server side.

  • The browser’s URL does not change.

  • The same request and response objects are used, so request attributes are preserved.

  • Faster because no extra HTTP request is made.

  • Can forward only to resources within the same application.

  • Example: request.getRequestDispatcher("page.jsp").forward(request, response);

2. sendRedirect() (HttpServletResponse):

  • Executed on the client side.

  • Browser’s URL changes to the new location.

  • A new request is created, so request attributes are lost.

  • Slower due to an extra round trip to the client.

  • Can redirect to any URL, even outside the application.

  • Example: response.sendRedirect("https://example.com");

Summary:

Use forward() for internal navigation without changing the URL; use sendRedirect() for external links or when a fresh request is needed.

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