Make AJP trace messages a bit less cryptic.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1152450 13f79535-47bb-0310-9956-ffa450edef68

modules/proxy/ajp_utils.c

@@ -105,3 +105,31 @@ cleanup:
                          "ajp_handle_cping_cpong: Done");
     return rv;
 }
+
+
+#define case_to_str(x)    case CMD_AJP13_##x:\
+                              return #x;\
+                              break;
+
+/**<2A>
+ * Convert numeric message type into string
+ * @param type      AJP message type
+ * @return          AJP message type as a string
+ */
+const char *ajp_type_str(int type)
+{
+    switch (type) {
+        case_to_str(FORWARD_REQUEST)
+        case_to_str(SEND_BODY_CHUNK)
+        case_to_str(SEND_HEADERS)
+        case_to_str(END_RESPONSE)
+        case_to_str(GET_BODY_CHUNK)
+        case_to_str(SHUTDOWN)
+        case_to_str(PING)
+        case_to_str(CPONG)
+        case_to_str(CPING)
+        default:
+            return "CMD_AJP13_UNKNOWN";
+    }
+
+}