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ShowHeaders.java
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49 lines (36 loc) · 1.35 KB
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package com.zetcode.web;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
@WebServlet(name = "ShowHeaders", urlPatterns = {"/ShowHeaders"})
public class ShowHeaders extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
PrintWriter out = response.getWriter();
response.setContentType("text/html");
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>HTTP headers</title>");
out.println("<body>");
out.println("<h2>Headers</h2>");
Enumeration<String> headerNames = request.getHeaderNames();
out.println("<ol>");
while (headerNames.hasMoreElements()) {
out.print("<li>");
String headerName = headerNames.nextElement();
out.print(headerName + " = ");
String headerValue = request.getHeader(headerName);
out.print(headerValue);
out.println("</li>");
}
out.println("</ol>");
out.println("</body>");
out.println("</html>");
}
}