Index: Http11Processor.java
===================================================================
--- Http11Processor.java	(revision 511555)
+++ Http11Processor.java	(working copy)
@@ -1203,6 +1203,10 @@
             http11 = false;
             error = true;
             // Send 505; Unsupported HTTP version
+            if (log.isDebugEnabled()) {
+                log.debug(sm.getString("http11processor.request.prepare")+
+                        " Unsupported HTTP version \""+protocolMB+"\"");
+            }
             response.setStatus(505);
         }
 
@@ -1311,6 +1315,10 @@
                 // Unsupported transfer encoding
                 error = true;
                 // 501 - Unimplemented
+                if (log.isDebugEnabled()) {
+                    log.debug(sm.getString("http11processor.request.prepare")+
+                            " Unsupported transfer encoding \""+encodingName+"\"");
+                }
                 response.setStatus(501);
             }
         }
@@ -1329,6 +1337,10 @@
         if (http11 && (valueMB == null)) {
             error = true;
             // 400 - Bad request
+            if (log.isDebugEnabled()) {
+                log.debug(sm.getString("http11processor.request.prepare")+
+                        " host header missing");
+            }
             response.setStatus(400);
         }