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diff --git a/src/sync/sync-httpd.h b/src/sync/sync-httpd.h
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+/*
+  This file is part of TALER
+  Copyright (C) 2019 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file sync/sync-httpd.h
+ * @brief HTTP serving layer
+ * @author Christian Grothoff
+ */
+#ifndef sync_HTTPD_H
+#define sync_HTTPD_H
+
+#include "platform.h"
+#include <microhttpd.h>
+#include "sync_database_lib.h"
+
+/**
+ * @brief Struct describing an URL and the handler for it.
+ */
+struct TMH_RequestHandler
+{
+
+  /**
+   * URL the handler is for.
+   */
+  const char *url;
+
+  /**
+   * Method the handler is for, NULL for "all".
+   */
+  const char *method;
+
+  /**
+   * Mime type to use in reply (hint, can be NULL).
+   */
+  const char *mime_type;
+
+  /**
+   * Raw data for the @e handler
+   */
+  const void *data;
+
+  /**
+   * Number of bytes in @e data, 0 for 0-terminated.
+   */
+  size_t data_size;
+
+  /**
+   * Function to call to handle the request.
+   *
+   * @param rh this struct
+   * @param mime_type the @e mime_type for the reply (hint, can be NULL)
+   * @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 (*handler)(struct TMH_RequestHandler *rh,
+                 struct MHD_Connection *connection,
+                 void **connection_cls,
+                 const char *upload_data,
+                 size_t *upload_data_size);
+
+  /**
+   * Default response code.
+   */
+  int response_code;
+};
+
+
+/**
+ * Each MHD response handler that sets the "connection_cls" to a
+ * non-NULL value must use a struct that has this struct as its first
+ * member.  This struct contains a single callback, which will be
+ * invoked to clean up the memory when the contection is completed.
+ */
+struct TM_HandlerContext;
+
+/**
+ * Signature of a function used to clean up the context
+ * we keep in the "connection_cls" of MHD when handling
+ * a request.
+ *
+ * @param hc header of the context to clean up.
+ */
+typedef void
+(*TM_ContextCleanup)(struct TM_HandlerContext *hc);
+
+
+/**
+ * Each MHD response handler that sets the "connection_cls" to a
+ * non-NULL value must use a struct that has this struct as its first
+ * member.  This struct contains a single callback, which will be
+ * invoked to clean up the memory when the connection is completed.
+ */
+struct TM_HandlerContext
+{
+
+  /**
+   * Function to execute the handler-specific cleanup of the
+   * (typically larger) context.
+   */
+  TM_ContextCleanup cc;
+
+  /**
+   * Which request handler is handling this request?
+   */
+  const struct TMH_RequestHandler *rh;
+
+  /**
+   * Asynchronous request context id.
+   */
+  struct GNUNET_AsyncScopeId async_scope_id;
+};
+
+
+/**
+ * Should a "Connection: close" header be added to each HTTP response?
+ */
+extern int TMH_sync_connection_close;
+
+/**
+ * Handle to the database backend.
+ */
+extern struct sync_DatabasePlugin *db;
+
+/**
+ * Kick MHD to run now, to be called after MHD_resume_connection().
+ * Basically, we need to explicitly resume MHD's event loop whenever
+ * we made progress serving a request.  This function re-schedules
+ * the task processing MHD's activities to run immediately.
+ */
+void
+TMH_trigger_daemon (void);
+
+#endif