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diff --git a/src/mint/taler-mint-httpd_responses.c b/src/mint/taler-mint-httpd_responses.c
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+/*
+ This file is part of TALER
+ (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-mint-httpd_responses.c
+ * @brief API for generating the various replies of the mint; these
+ * functions are called TALER_MINT_reply_ and they generate
+ * and queue MHD response objects for a given connection.
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler-mint-httpd_responses.h"
+
+
+/**
+ * Send JSON object as response. Decreases the reference count of the
+ * JSON object.
+ *
+ * @param connection the MHD connection
+ * @param json the json object
+ * @param response_code the http response code
+ * @return MHD result code
+ */
+int
+TALER_MINT_reply_json (struct MHD_Connection *connection,
+ json_t *json,
+ unsigned int response_code)
+{
+ struct MHD_Response *resp;
+ char *json_str;
+ int ret;
+
+ json_str = json_dumps (json, JSON_INDENT(2));
+ json_decref (json);
+ resp = MHD_create_response_from_buffer (strlen (json_str), json_str,
+ MHD_RESPMEM_MUST_FREE);
+ if (NULL == resp)
+ return MHD_NO;
+ (void) MHD_add_response_header (resp,
+ MHD_HTTP_HEADER_CONTENT_TYPE,
+ "application/json");
+ ret = MHD_queue_response (connection, response_code, resp);
+ MHD_destroy_response (resp);
+ return ret;
+}
+
+
+/**
+ * Function to call to handle the request by building a JSON
+ * reply from a format string and varargs.
+ *
+ * @param connection the MHD connection to handle
+ * @param response_code HTTP response code to use
+ * @param fmt format string for pack
+ * @param ... varargs
+ * @return MHD result code
+ */
+int
+TALER_MINT_reply_json_pack (struct MHD_Connection *connection,
+ unsigned int response_code,
+ const char *fmt,
+ ...)
+{
+ json_t *json;
+ va_list argp;
+
+ va_start (argp, fmt);
+ json = json_vpack_ex (NULL, 0, fmt, argp);
+ va_end (argp);
+ if (NULL == json)
+ return MHD_NO;
+ return TALER_MINT_reply_json (connection,
+ json,
+ response_code);
+}
+
+
+/**
+ * Send a response indicating an invalid argument.
+ *
+ * @param connection the MHD connection to use
+ * @param param_name the parameter that is invalid
+ * @return a MHD result code
+ */
+int
+TALER_MINT_reply_arg_invalid (struct MHD_Connection *connection,
+ const char *param_name)
+{
+ json_t *json;
+
+ json = json_pack ("{ s:s, s:s }",
+ "error",
+ "invalid parameter",
+ "parameter",
+ param_name);
+ return TALER_MINT_reply_json (connection,
+ json,
+ MHD_HTTP_BAD_REQUEST);
+}
+
+
+/**
+ * Send a response indicating a missing argument.
+ *
+ * @param connection the MHD connection to use
+ * @param param_name the parameter that is missing
+ * @return a MHD result code
+ */
+int
+TALER_MINT_reply_arg_missing (struct MHD_Connection *connection,
+ const char *param_name)
+{
+ json_t *json;
+
+ json = json_pack ("{ s:s, s:s }",
+ "error",
+ "missing parameter",
+ "parameter",
+ param_name);
+ return TALER_MINT_reply_json (connection,
+ json,
+ MHD_HTTP_BAD_REQUEST);
+}
+
+
+
+
+
+
+
+/* end of taler-mint-httpd_responses.c */