Dumping HTTP Headers

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How to display HTTP headers from server pages. AOL Server, Java Server Pages, Ruby on Rails, PHP, etc.

Contents 1 Ruby on Rails rhtml code to dump HTTP headers. 2 AOL Server adp code to dump HTTP headers. 3 PHP code to dump HTTP Headers 4 JSP/Java code to dump HTTP Headers

Ruby on Rails rhtml code to dump HTTP headers.

The request.env has the HTTP headers prefixed with HTTP_. It also has other environment variables. This code pulls just the items starting with HTTP_ and then strips the HTTP_ portion for easy reading.

<table border="1">
<% for header in request.env.select {|k,v| k.match("^HTTP.*")} %>
  <tr>
    <td><%=header[0].split('_',2)[1]%></td><td><%=header[1]%></td>    
  </tr>
<% end %>
</table>

AOL Server adp code to dump HTTP headers.

<%
for { set i 0 } { $i < [ns_set size [ns_conn headers]] } { incr i } {
    ns_puts "[ns_set key [ns_conn headers] $i]: [ns_set \
                value [ns_conn headers] $i]"
}
%>

PHP code to dump HTTP Headers

I think the quality/implementation of this code varies depending on how you are running php.

My site uses cgi and I use this

 <?php
   foreach($_SERVER as $h=>$v)
     if(ereg('HTTP_(.+)',$h,$hp))
       echo "<li>$h = $v</li>\n";
   header('Content-type: text/html');
  ?>

http://www.tonycode.com/tools/showHTTPHeaders.php

JSP/Java code to dump HTTP Headers

 <%

 out.println("<ul>");

 java.util.Enumeration names = request.getHeaderNames();
 while (names.hasMoreElements()) {
   String name = (String) names.nextElement();
   String value = request.getHeader(name);
   out.println(" <li>     <b>" + name + "=</b>" + value +"</li>");
 }
 out.println("</ul>");

 %>