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diff --git a/src/backend/taler-merchant-httpd_mhd.h b/src/backend/taler-merchant-httpd_mhd.h
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+/*
+  This file is part of TALER
+  Copyright (C) 2014 GNUnet e.V.
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License along with
+  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file taler-merchant-httpd_mhd.h
+ * @brief helpers for MHD interaction, used to generate simple responses
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#ifndef TALER_MINT_HTTPD_MHD_H
+#define TALER_MINT_HTTPD_MHD_H
+#include <gnunet/gnunet_util_lib.h>
+#include <microhttpd.h>
+#include "taler-merchant-httpd.h"
+
+
+/**
+ * Function to call to handle the request by sending
+ * back static data from the @a rh.
+ *
+ * @param rh context of the handler
+ * @param connection the MHD connection to handle
+ * @param[in,out] connection_cls the connection's closure (can be updated)
+ * @param upload_data upload data
+ * @param[in,out] upload_data_size number of bytes (left) in @a upload_data
+ * @return MHD result code
+ */
+int
+TMH_MHD_handler_static_response (struct TMH_RequestHandler *rh,
+                                 struct MHD_Connection *connection,
+                                 void **connection_cls,
+                                 const char *upload_data,
+                                 size_t *upload_data_size);
+
+
+/**
+ * Function to call to handle the request by sending
+ * back a redirect to the AGPL source code.
+ *
+ * @param rh context of the handler
+ * @param connection the MHD connection to handle
+ * @param[in,out] connection_cls the connection's closure (can be updated)
+ * @param upload_data upload data
+ * @param[in,out] upload_data_size number of bytes (left) in @a upload_data
+ * @return MHD result code
+ */
+int
+TMH_MHD_handler_agpl_redirect (struct TMH_RequestHandler *rh,
+                               struct MHD_Connection *connection,
+                               void **connection_cls,
+                               const char *upload_data,
+                               size_t *upload_data_size);
+
+
+/**
+ * Function to call to handle the request by building a JSON
+ * reply from varargs.
+ *
+ * @param rh context of the handler
+ * @param connection the MHD connection to handle
+ * @param[in,out] connection_cls the connection's closure (can be updated)
+ * @param response_code HTTP response code to use
+ * @param do_cache can the response be cached? (0: no, 1: yes)
+ * @param fmt format string for pack
+ * @param ... varargs
+ * @return MHD result code
+ */
+int
+TMH_MHD_helper_send_json_pack (struct TMH_RequestHandler *rh,
+                               struct MHD_Connection *connection,
+                               void *connection_cls,
+                               int response_code,
+                               int do_cache,
+                               const char *fmt,
+                               ...);
+
+
+/**
+ * Function to call to handle the request by building a JSON
+ * reply with an error message from @a rh.
+ *
+ * @param rh context of the handler
+ * @param connection the MHD connection to handle
+ * @param[in,out] connection_cls the connection's closure (can be updated)
+ * @param upload_data upload data
+ * @param[in,out] upload_data_size number of bytes (left) in @a upload_data
+ * @return MHD result code
+ */
+int
+TMH_MHD_handler_send_json_pack_error (struct TMH_RequestHandler *rh,
+                                      struct MHD_Connection *connection,
+                                      void **connection_cls,
+                                      const char *upload_data,
+                                      size_t *upload_data_size);
+
+
+#endif