report request headers

core/src/main/java/hudson/Functions.java

@@ -1332,4 +1332,13 @@ public class Functions {
     public static void restoreCurrentDescriptorByNameUrl(String old) {
         Stapler.getCurrentRequest().setAttribute("currentDescriptorByNameUrl", old);
     }
+
+    public static List<String> getRequestHeaders(String name) {
+        List<String> r = new ArrayList<String>();
+        Enumeration e = Stapler.getCurrentRequest().getHeaders(name);
+        while (e.hasMoreElements()) {
+            r.add(e.nextElement().toString());
+        }
+        return r;
+    }
 }

core/src/main/resources/hudson/model/Hudson/whoAmI.jelly

@@ -68,6 +68,24 @@ THE SOFTWARE.
           <td>${auth}</td>
         </tr>
       </table>
+
+      <h2>Request Headers</h2>
+      <table>
+        <j:forEach var="n" items="${request.getHeaderNames()}">
+          <j:set var="values" value="${h.getRequestHeaders(n)}"/>
+          <tr>
+            <td rowspan="${values.size()}">${n}</td>
+            <td>
+              ${values[0]}
+            </td>
+          </tr>
+          <j:forEach var="v" items="${values.subList(1,values.size())}">
+            <tr>
+              <td>${v}</td>
+            </tr>
+          </j:forEach>
+        </j:forEach>
+      </table>
     </l:main-panel>
   </l:layout>
 </j:jelly>