diff --git a/web/CXM_common.anubis b/web/CXM_common.anubis
index aa627bb..71e2a60 100644
--- a/web/CXM_common.anubis
+++ b/web/CXM_common.anubis
@@ -12,7 +12,8 @@
  *Name* HTTP_header
  *Description*  
  
-read system/string.anubis
+transmit tools/basis.anubis
+transmit system/string.anubis
  
 /**
  * The type 'HTTP_header' describes HTTP headers, which are just pairs '(name,value)'.
@@ -39,6 +40,21 @@ public define Maybe(String)
         }
     }. 
 
+public define List(String)
+  to_List_String
+  (
+    List(HTTP_header) l
+  )=
+  map((HTTP_header h) |-> h.name +": "+h.value, l ).
+  
+public define String
+  to_String
+  (
+    List(HTTP_header) l
+  )=
+  join("\n\r",to_List_String(l)).
+  
+  
  *Name* Web_arg
  *Description*
 
--
libgit2 0.21.4