{"id":26597,"date":"2021-04-29T23:10:08","date_gmt":"2021-04-30T03:10:08","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/recent-posts\/webclient-client-application-that-can-talk-interactively-to-web-servers-requires-the-components-listed-below-programming-code-examples-java-j2ee-j2me-network-programming\/"},"modified":"2021-04-29T23:10:08","modified_gmt":"2021-04-30T03:10:08","slug":"webclient-client-application-that-can-talk-interactively-to-web-servers-requires-the-components-listed-below-programming-code-examples-java-j2ee-j2me-network-programming","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=26597","title":{"rendered":"WebClient – Client application that can talk interactively to Web servers. Requires the components listed below #Programming Code Examples #Java\/J2EE\/J2ME #Network Programming"},"content":{"rendered":"
\nWebClient - Client application that can talk interactively to Web servers. Requires the components listed below\n\nimport java.awt.*; \/\/ For BorderLayout, GridLayout, Font, Color.\nimport java.awt.event.*;\nimport java.util.*;\nimport javax.swing.*;\n\n\/** A graphical client that lets you interactively connect to\n *  Web servers and send custom request lines and\n *  request headers.\n *\n *  Taken from Core Web Programming from\n *  Prentice Hall and Sun Microsystems Press,\n *  .\n *  © 2001 Marty Hall and Larry Brown;\n *  may be freely used or adapted.\n *\/\n\npublic class WebClient extends JPanel\n    implements Runnable, Interruptible, ActionListener {\n  public static void main(String[] args) {\n    WindowUtilities.setNativeLookAndFeel();\n    WindowUtilities.openInJFrame(new WebClient(), 600, 700,\n                                 "Web Client",\n                                 SystemColor.control);\n  }\n\n  private LabeledTextField hostField, portField,\n          requestLineField;\n  private JTextArea requestHeadersArea, resultArea;\n  private String host, requestLine;\n  private int port;\n  private String[] requestHeaders = new String[30];\n  private JButton submitButton, interruptButton;\n  private boolean isInterrupted = false;\n\n  public WebClient() {\n    setLayout(new BorderLayout(5, 30));\n    int fontSize = 14;\n    Font labelFont =\n      new Font("Serif", Font.BOLD, fontSize);\n    Font headingFont =\n      new Font("SansSerif", Font.BOLD, fontSize+4);\n    Font textFont =\n      new Font("Monospaced", Font.BOLD, fontSize-2);\n    JPanel inputPanel = new JPanel();\n    inputPanel.setLayout(new BorderLayout());\n    JPanel labelPanel = new JPanel();\n    labelPanel.setLayout(new GridLayout(4,1));\n    hostField = new LabeledTextField("Host:", labelFont,\n                                     30, textFont);\n    portField = new LabeledTextField("Port:", labelFont,\n                                     "80", 5, textFont);\n    \/\/ Use HTTP 1.0 for compatibility with the most servers.\n    \/\/ If you switch this to 1.1, you *must* supply a\n    \/\/ Host: request header.\n    requestLineField =\n      new LabeledTextField("Request Line:", labelFont,\n                           "GET \/ HTTP\/1.0", 50, textFont);\n    labelPanel.add(hostField);\n    labelPanel.add(portField);\n    labelPanel.add(requestLineField);\n    JLabel requestHeadersLabel =\n      new JLabel("Request Headers:");\n    requestHeadersLabel.setFont(labelFont);\n    labelPanel.add(requestHeadersLabel);\n    inputPanel.add(labelPanel, BorderLayout.NORTH);\n    requestHeadersArea = new JTextArea(5, 80);\n    requestHeadersArea.setFont(textFont);\n    JScrollPane headerScrollArea =\n      new JScrollPane(requestHeadersArea);\n    inputPanel.add(headerScrollArea, BorderLayout.CENTER);\n    JPanel buttonPanel = new JPanel();\n    submitButton = new JButton("Submit Request");\n    submitButton.addActionListener(this);\n    submitButton.setFont(labelFont);\n    buttonPanel.add(submitButton);\n    inputPanel.add(buttonPanel, BorderLayout.SOUTH);\n    add(inputPanel, BorderLayout.NORTH);\n    JPanel resultPanel = new JPanel();\n    resultPanel.setLayout(new BorderLayout());\n    JLabel resultLabel =\n      new JLabel("Results", JLabel.CENTER);\n    resultLabel.setFont(headingFont);\n    resultPanel.add(resultLabel, BorderLayout.NORTH);\n    resultArea = new JTextArea();\n    resultArea.setFont(textFont);\n    JScrollPane resultScrollArea =\n      new JScrollPane(resultArea);\n    resultPanel.add(resultScrollArea, BorderLayout.CENTER);\n    JPanel interruptPanel = new JPanel();\n    interruptButton = new JButton("Interrupt Download");\n    interruptButton.addActionListener(this);\n    interruptButton.setFont(labelFont);\n    interruptPanel.add(interruptButton);\n    resultPanel.add(interruptPanel, BorderLayout.SOUTH);\n    add(resultPanel, BorderLayout.CENTER);\n  }\n\n  public void actionPerformed(ActionEvent event) {\n    if (event.getSource() == submitButton) {\n      Thread downloader = new Thread(this);\n      downloader.start();\n    } else if (event.getSource() == interruptButton) {\n      isInterrupted = true;\n    }\n  }\n\n  public void run() {\n    isInterrupted = false;\n    if (hasLegalArgs())\n      new HttpClient(host, port, requestLine,\n\t\t     requestHeaders, resultArea, this);\n  }\n\n  public boolean isInterrupted() {\n    return(isInterrupted);\n  }\n\n  private boolean hasLegalArgs() {\n    host = hostField.getTextField().getText();\n    if (host.length() == 0) {\n      report("Missing hostname");\n      return(false);\n    }\n    String portString =\n      portField.getTextField().getText();\n    if (portString.length() == 0) {\n      report("Missing port number");\n      return(false);\n    }\n    try {\n      port = Integer.parseInt(portString);\n    } catch(NumberFormatException nfe) {\n      report("Illegal port number: " + portString);\n      return(false);\n    }\n    requestLine =\n      requestLineField.getTextField().getText();\n    if (requestLine.length() == 0) {\n      report("Missing request line");\n      return(false);\n    }\n    getRequestHeaders();\n    return(true);\n  }\n\n  private void report(String s) {\n    resultArea.setText(s);\n  }\n\n  private void getRequestHeaders() {\n    for(int i=0; i<requestheaders .length; i++) {\n      requestHeaders[i] = null;\n    }\n    int headerNum = 0;\n    String header =\n      requestHeadersArea.getText();\n    StringTokenizer tok =\n      new StringTokenizer(header, "rn");\n    while (tok.hasMoreTokens()) {\n      requestHeaders[headerNum++] = tok.nextToken();\n    }\n  }\n}\n\n\nHttpClient.java  Handles the underlying network communication. \n\nimport java.net.*;\nimport java.io.*;\nimport javax.swing.*;\n\n\/** The underlying network client used by WebClient.\n *\n *  Taken from Core Web Programming from\n *  Prentice Hall and Sun Microsystems Press,\n *  .\n *  © 2001 Marty Hall and Larry Brown;\n *  may be freely used or adapted.\n *\/\n\npublic class HttpClient extends NetworkClient {\n  private String requestLine;\n  private String[] requestHeaders;\n  private JTextArea outputArea;\n  private Interruptible app;\n\n  public HttpClient(String host, int port,\n                    String requestLine, String[] requestHeaders,\n                    JTextArea outputArea, Interruptible app) {\n    super(host, port);\n    this.requestLine = requestLine;\n    this.requestHeaders = requestHeaders;\n    this.outputArea = outputArea;\n    this.app = app;\n    if (checkHost(host)) {\n      connect();\n    }\n  }\n\n  protected void handleConnection(Socket uriSocket)\n      throws IOException {\n    try {\n      PrintWriter out = SocketUtil.getWriter(uriSocket);\n      BufferedReader in = SocketUtil.getReader(uriSocket);\n      outputArea.setText("");\n      out.println(requestLine);\n      for(int i=0; i<requestHeaders.length; i++) {\n        if (requestHeaders[i] == null) {\n          break;\n        } else {\n          out.println(requestHeaders[i]);\n        }\n      }\n      out.println();\n      String line;\n      while ((line = in.readLine()) != null &&\n             !app.isInterrupted()) {\n        outputArea.append(line + "n");\n      }\n      if (app.isInterrupted()) {\n        outputArea.append("---- Download Interrupted ----");\n      }\n    } catch(Exception e) {\n      outputArea.setText("Error: " + e);\n    }\n  }\n\n  private boolean checkHost(String host) {\n    try {\n      InetAddress.getByName(host);\n      return(true);\n    } catch(UnknownHostException uhe) {\n      outputArea.setText("Bogus host: " + host);\n      return(false);\n    }\n  }\n}\n\n\nLabeledTextField.java  A labeled text field for the WebClient graphical user interface.\n\nimport java.awt.*; \/\/ For FlowLayout, Font.\nimport javax.swing.*;\n\n\/** A TextField with an associated Label.\n *\n *  Taken from Core Web Programming from\n *  Prentice Hall and Sun Microsystems Press,\n *  .\n *  © 2001 Marty Hall and Larry Brown;\n *  may be freely used or adapted.\n *\/\n\npublic class LabeledTextField extends JPanel {\n  private JLabel label;\n  private JTextField textField;\n\n  public LabeledTextField(String labelString,\n                          Font labelFont,\n                          int textFieldSize,\n                          Font textFont) {\n    setLayout(new FlowLayout(FlowLayout.LEFT));\n    label = new JLabel(labelString, JLabel.RIGHT);\n    if (labelFont != null) {\n      label.setFont(labelFont);\n    }\n    add(label);\n    textField = new JTextField(textFieldSize);\n    if (textFont != null) {\n      textField.setFont(textFont);\n    }\n    add(textField);\n  }\n\n  public LabeledTextField(String labelString,\n                          String textFieldString) {\n    this(labelString, null, textFieldString,\n         textFieldString.length(), null);\n  }\n\n  public LabeledTextField(String labelString,\n                          int textFieldSize) {\n    this(labelString, null, textFieldSize, null);\n  }\n\n  public LabeledTextField(String labelString,\n                          Font labelFont,\n                          String textFieldString,\n                          int textFieldSize,\n                          Font textFont) {\n    this(labelString, labelFont,\n         textFieldSize, textFont);\n    textField.setText(textFieldString);\n  }\n\n  \/** The Label at the left side of the LabeledTextField.\n   *  To manipulate the Label, do:\n   *  <\/pre>\n
\n   *    LabeledTextField ltf = new LabeledTextField(...);\n   *    ltf.getLabel().someLabelMethod(...);\n   *  <\/pre>\n
   *\/<\/p>\n
  public JLabel getLabel() {
\n    return(label);
\n  }<\/p>\n
  \/** The TextField at the right side of the
\n   *  LabeledTextField.
\n   *\/<\/p>\n
  public JTextField getTextField() {
\n    return(textField);
\n  }
\n}<\/p>\n
Interruptible.java  Polls to see if the user choose to interrupt the current network download.<\/p>\n
\/** An interface for classes that can be polled to see
\n *  if they’ve been interrupted. Used by HttpClient
\n *  and WebClient to allow the user to interrupt a network
\n *  download.
\n *
\n *  Taken from Core Web Programming from
\n *  Prentice Hall and Sun Microsystems Press,
\n *  .
\n *  © 2001 Marty Hall and Larry Brown;
\n *  may be freely used or adapted.
\n *\/<\/p>\n
public interface Interruptible {
\n  public boolean isInterrupted();
\n}<\/p>\n
NetworkClient.java  Starting point for a network client to communicate with a remote computer. <\/p>\n
import java.net.*;
\nimport java.io.*;<\/p>\n
\/** A starting point for network clients. You’ll need to
\n *  override handleConnection, but in many cases connect can
\n *  remain unchanged. It uses SocketUtil to simplify the
\n *  creation of the PrintWriter and BufferedReader.
\n *
\n *  Taken from Core Web Programming from
\n *  Prentice Hall and Sun Microsystems Press,
\n *  © 2001 Marty Hall and Larry Brown;
\n *  may be freely used or adapted.
\n *\/<\/p>\n
public class NetworkClient {
\n  protected String host;
\n  protected int port;<\/p>\n
  \/** Register host and port. The connection won’t
\n   *  actually be established until you call
\n   *  connect.
\n   *\/<\/p>\n
  public NetworkClient(String host, int port) {
\n    this.host = host;
\n    this.port = port;
\n  }<\/p>\n
  \/** Establishes the connection, then passes the socket
\n   *  to handleConnection.
\n   *\/<\/p>\n
  public void connect() {
\n    try {
\n      Socket client = new Socket(host, port);
\n      handleConnection(client);
\n    } catch(UnknownHostException uhe) {
\n      System.out.println("Unknown host: " + host);
\n      uhe.printStackTrace();
\n    } catch(IOException ioe) {
\n      System.out.println("IOException: " + ioe);
\n      ioe.printStackTrace();
\n    }
\n  }<\/p>\n
  \/** This is the method you will override when
\n   *  making a network client for your task.
\n   *  The default version sends a single line
\n   *  ("Generic Network Client") to the server,
\n   *  reads one line of response, prints it, then exits.
\n   *\/<\/p>\n
  protected void handleConnection(Socket client)
\n    throws IOException {
\n    PrintWriter out = SocketUtil.getWriter(client);
\n    BufferedReader in = SocketUtil.getReader(client);
\n    out.println("Generic Network Client");
\n    System.out.println
\n      ("Generic Network Client:n" +
\n       "Made connection to " + host +
\n       " and got ‘" + in.readLine() + "’ in response");
\n    client.close();
\n  }<\/p>\n
  \/** The hostname of the server we’re contacting. *\/<\/p>\n
  public String getHost() {
\n    return(host);
\n  }<\/p>\n
  \/** The port connection will be made on. *\/<\/p>\n
  public int getPort() {
\n    return(port);
\n  }
\n}<\/p>\n
SocketUtil.java: Provides utilities for wrapping a BufferedReader  and PrintWriter around the Socket’s input and output streams, respectively. <\/p>\n
import java.net.*;
\nimport java.io.*;<\/p>\n
\/** A shorthand way to create BufferedReaders and
\n *  PrintWriters associated with a Socket.
\n *
\n *  Taken from Core Web Programming from
\n *  Prentice Hall and Sun Microsystems Press,
\n *  .
\n *  © 2001 Marty Hall and Larry Brown;
\n *  may be freely used or adapted.
\n *\/<\/p>\n
public class SocketUtil {
\n  \/** Make a BufferedReader to get incoming data. *\/<\/p>\n
  public static BufferedReader getReader(Socket s)
\n      throws IOException {
\n    return(new BufferedReader(
\n       new InputStreamReader(s.getInputStream())));
\n  }<\/p>\n
  \/** Make a PrintWriter to send outgoing data.
\n   *  This PrintWriter will automatically flush stream
\n   *  when println is called.
\n   *\/<\/p>\n
  public static PrintWriter getWriter(Socket s)
\n      throws IOException {
\n    \/\/ Second argument of true means autoflush.
\n    return(new PrintWriter(s.getOutputStream(), true));
\n  }
\n}<\/p>\n
WindowUtilities.java  Simplifies the setting of native look and feel.<\/p>\n
import javax.swing.*;
\nimport java.awt.*;   \/\/ For Color and Container classes.<\/p>\n
\/** A few utilities that simplify using windows in Swing.
\n *
\n *  Taken from Core Web Programming from
\n *  Prentice Hall and Sun Microsystems Press,
\n *  © 2001 Marty Hall and Larry Brown;
\n *  may be freely used or adapted.
\n *\/<\/p>\n
public class WindowUtilities {<\/p>\n
  \/** Tell system to use native look and feel, as in previous
\n   *  releases. Metal (Java) LAF is the default otherwise.
\n   *\/<\/p>\n
  public static void setNativeLookAndFeel() {
\n    try {
\n     UIManager.setLookAndFeel(
\n       UIManager.getSystemLookAndFeelClassName());
\n    } catch(Exception e) {
\n      System.out.println("Error setting native LAF: " + e);
\n    }
\n  }<\/p>\n
  public static void setJavaLookAndFeel() {
\n    try {
\n     UIManager.setLookAndFeel(
\n       UIManager.getCrossPlatformLookAndFeelClassName());
\n    } catch(Exception e) {
\n      System.out.println("Error setting Java LAF: " + e);
\n    }
\n  }<\/p>\n
   public static void setMotifLookAndFeel() {
\n    try {
\n      UIManager.setLookAndFeel(
\n        "com.sun.java.swing.plaf.motif.MotifLookAndFeel");
\n    } catch(Exception e) {
\n      System.out.println("Error setting Motif LAF: " + e);
\n    }
\n  }<\/p>\n
  \/** A simplified way to see a JPanel or other Container. Pops
\n   *  up a JFrame with specified Container as the content pane.
\n   *\/<\/p>\n
  public static JFrame openInJFrame(Container content,
\n                                    int width,
\n                                    int height,
\n                                    String title,
\n                                    Color bgColor) {
\n    JFrame frame = new JFrame(title);
\n    frame.setBackground(bgColor);
\n    content.setBackground(bgColor);
\n    frame.setSize(width, height);
\n    frame.setContentPane(content);
\n    frame.addWindowListener(new ExitListener());
\n    frame.setVisible(true);
\n    return(frame);
\n  }<\/p>\n
  \/** Uses Color.white as the background color. *\/<\/p>\n
  public static JFrame openInJFrame(Container content,
\n                                    int width,
\n                                    int height,
\n                                    String title) {
\n    return(openInJFrame(content, width, height,
\n                        title, Color.white));
\n  }<\/p>\n
  \/** Uses Color.white as the background color, and the
\n   *  name of the Container’s class as the JFrame title.
\n   *\/<\/p>\n
  public static JFrame openInJFrame(Container content,
\n                                    int width,
\n                                    int height) {
\n    return(openInJFrame(content, width, height,
\n                        content.getClass().getName(),
\n                        Color.white));
\n  }
\n}<\/p>\n
ExitListener.java  WindowListener for applications in this chapter.<\/p>\n
import java.awt.*;
\nimport java.awt.event.*;<\/p>\n
\/** A listener that you attach to the top-level JFrame of
\n *  your application, so that quitting the frame exits the
\n *  application.
\n *
\n *  Taken from Core Web Programming from
\n *  Prentice Hall and Sun Microsystems Press,
\n *  © 2001 Marty Hall and Larry Brown;
\n *  may be freely used or adapted.
\n *\/
\npublic class ExitListener extends WindowAdapter {
\n  public void windowClosing(WindowEvent event) {
\n    System.exit(0);
\n  }
\n}<\/p>\n
Note: Brought from our old site: http:\/\/www.salearningschool.com\/example_codes\/ on Jan 2nd, 2017 From: http:\/\/sitestree.com\/?p=10234
 Categories:Programming Code Examples, Java\/J2EE\/J2ME, Network Programming
Tags:Java\/J2EE\/J2MENetwork Programming
 Post Data:2017-01-02 16:04:28<\/p>\n
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WebClient – Client application that can talk interactively to Web servers. Requires the components listed below import java.awt.*; \/\/ For BorderLayout, GridLayout, Font, Color. import java.awt.event.*; import java.util.*; import javax.swing.*; \/** A graphical client that lets you interactively connect to * Web servers and send custom request lines and * request headers. * * Taken … <\/p>\n
Continue reading<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1917],"tags":[],"class_list":["post-26597","post","type-post","status-publish","format-standard","hentry","category-fromsitestree-com","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":10198,"url":"http:\/\/bangla.sitestree.com\/?p=10198","url_meta":{"origin":26597,"position":0},"title":"WebClient – Client application that can talk interactively to Web servers. Requires the components listed below","author":"","date":"August 25, 2015","format":false,"excerpt":"import java.awt.*; \/\/ For BorderLayout, GridLayout, Font, Color. import java.awt.event.*; import java.util.*; import javax.swing.*; \/** A graphical client that lets you interactively connect to \u00a0*\u00a0 Web servers and send custom request lines and \u00a0*\u00a0 request headers. \u00a0* \u00a0*\u00a0 Taken from Core Web Programming from \u00a0*\u00a0 Prentice Hall and Sun Microsystems\u2026","rel":"","context":"In "Code . Programming Samples . \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae \u0989\u09a6\u09be\u09b9\u09b0\u09a8"","block_context":{"text":"Code . Programming Samples . \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae \u0989\u09a6\u09be\u09b9\u09b0\u09a8","link":"http:\/\/bangla.sitestree.com\/?cat=1417"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10192,"url":"http:\/\/bangla.sitestree.com\/?p=10192","url_meta":{"origin":26597,"position":1},"title":"UrlRetriever.java Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes","author":"","date":"August 24, 2015","format":false,"excerpt":"UrlRetriever.java\u00a0 Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes: import java.util.*; \/** This parses the input to get a host, port, and file, then \u00a0*\u00a0 passes these three values to the UriRetriever\u2026","rel":"","context":"In "Code . Programming Samples . \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae \u0989\u09a6\u09be\u09b9\u09b0\u09a8"","block_context":{"text":"Code . Programming Samples . \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae \u0989\u09a6\u09be\u09b9\u09b0\u09a8","link":"http:\/\/bangla.sitestree.com\/?cat=1417"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":26591,"url":"http:\/\/bangla.sitestree.com\/?p=26591","url_meta":{"origin":26597,"position":2},"title":"UrlRetriever.java  Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes: #Programming Code Examples #Java\/J2EE\/J2ME #Network Programming","author":"Author-Check- Article-or-Video","date":"April 29, 2021","format":false,"excerpt":"UrlRetriever.java Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes: import java.util.*; \/** This parses the input to get a host, port, and file, then * passes these three values to the UriRetriever\u2026","rel":"","context":"In "FromSitesTree.com"","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":26589,"url":"http:\/\/bangla.sitestree.com\/?p=26589","url_meta":{"origin":26597,"position":3},"title":"AddressVerifier.java  Connects to an SMTP server and issues a expn request to display details about a mailbox on the server. Uses the following classes: #Programming Code Examples #Java\/J2EE\/J2ME #Network Programming","author":"Author-Check- Article-or-Video","date":"April 29, 2021","format":false,"excerpt":"AddressVerifier.java Connects to an SMTP server and issues a expn request to display details about a mailbox on the server. Uses the following classes: import java.net.*; import java.io.*; \/** Given an e-mail address of the form user@host, * connect to port 25 of the host and issue an * 'expn'\u2026","rel":"","context":"In "FromSitesTree.com"","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10189,"url":"http:\/\/bangla.sitestree.com\/?p=10189","url_meta":{"origin":26597,"position":4},"title":"AddressVerifier.java Connects to an SMTP server and issues a expn request to display details about a mailbox on the server. Uses the following classes","author":"","date":"August 24, 2015","format":false,"excerpt":"import java.net.*; import java.io.*; \/** Given an e-mail address of the form user@host, \u00a0*\u00a0 connect to port 25 of the host and issue an \u00a0*\u00a0 'expn' request for the user. 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