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Explanation

HttpServletRequest provides information about the incoming HTTP request, while HttpServletResponse is used to construct the response.

Code:

doGet(HttpServletRequest request,
      HttpServletResponse response) {

    // request → client information
    // response → server response
}

Explanation

Read request information such as HTTP method, URI, and client information from HttpServletRequest.

Code:

String method = request.getMethod();
String uri = request.getRequestURI();
String ip = request.getRemoteAddr();

Explanation

Set the response content type before writing data to the client.

Code:

response.setContentType("text/html");

PrintWriter out = response.getWriter();
out.println("<h1>Hello</h1>");

Explanation

Set HTTP status codes to indicate the result of request processing.

Code:

response.setStatus(HttpServletResponse.SC_OK);

// Example error
response.sendError(
    HttpServletResponse.SC_NOT_FOUND,
    "User not found"
);

Explanation

Redirect the client to another URL using sendRedirect().

Code:

response.sendRedirect("login.html");