How to read a HTTP header using JSP?

JSPJava 8Object Oriented ProgrammingProgramming

Following is the example which uses getHeaderNames() method of HttpServletRequest to read the HTTP header information. This method returns an Enumeration that contains the header information associated with the current HTTP request.

Once we have an Enumeration, we can loop down the Enumeration in the standard manner. We will use the hasMoreElements() method to determine when to stop and the nextElement() method to get the name of each parameter name.

<%@ page import = "java.io.*,java.util.*" %>

<html>
   <head>
      <title>HTTP Header Request Example</title>
   </head>
   <body>
      <center>
         <h2>HTTP Header Request Example</h2>
         <table width = "100%" border = "1" align = "center">
            <tr bgcolor = "#949494">
               <th>Header Name</th>
               <th>Header Value(s)</th>
            </tr>
            <%
               Enumeration headerNames = request.getHeaderNames();
               while(headerNames.hasMoreElements()) {
                  String paramName = (String)headerNames.nextElement();
                  out.print("<tr><td>" + paramName + "</td>\n");
                  String paramValue = request.getHeader(paramName);
                  out.println("<td> " + paramValue + "</td></tr>\n");
               }
            %>
         </table>
      </center>
   </body>
</html>

Let us now put the above code in main.jsp and try to access it.

HTTP Header Request Example

Header NameHeader Value(s)
accept*/*
accept-languageen-us
user-agentMozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; InfoPath.2; MS-RTC LM 8)
accept-encodinggzip, deflate
hostlocalhost:8080
connectionKeep-Alive
cache-controlno-cache
raja
Published on 20-Mar-2019 12:24:56
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