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Servlet for reading headers in a HTTP request |
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This J2EE tip is demonstrating a method of reading a header in a request. When an HTTP
client (e.g. a browser) sends a request, it is required to supply a request line
(usually GET or POST). If it wants to, it can also send a number of headers, all
of which are optional except for Content-Length, which is required only for POST
requests. Here are some example of headers: Accept-Encoding, Accept-Charset,
Connection, Content, Cookie, Pragma etc.
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
public class ShowHeaders extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Servlet Example: Showing Request Headers";
Enumeration headerNames = request.getHeaderNames();
while(headerNames.hasMoreElements()) {
String headerName = (String)headerNames.nextElement();
String headerValue = request.getHeader(headerName);
out.println(headerName +"\t"+headerValue);
}
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
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