diff --git a/src/api_piqi_util.ml b/src/api_piqi_util.ml
index 62f4454..a66444e 100644
--- a/src/api_piqi_util.ml
+++ b/src/api_piqi_util.ml
@@ -246,13 +246,6 @@ module ReferencePerson
 
 end
 
-let get_params conf parse =
-  match (p_getenvbin conf.env "data", p_getenvbin conf.env "input") with
-  | (Some d, Some "pb") -> parse d `pb
-  | (Some d, Some "json") -> parse d `json
-  | (Some d, Some "xml") -> parse d `xml
-  | _ -> exit (-2)
-
 let print_result conf data =
   let (content_type, output) =
     match p_getenvbin conf.env "output" with
@@ -265,6 +258,36 @@ let print_result conf data =
   Util.html ~content_type conf ;
   Output.print_string conf data
 
+let from_piqi_status = function
+  | `bad_request -> Def.Bad_Request
+  | `unauthorized -> Def.Unauthorized
+  | `forbidden -> Def.Forbidden
+  | `not_found -> Def.Not_Found
+  | `conflict -> Def.Conflict
+
+(** [print_error conf code]
+    Print error code and [raise Exit]
+*)
+let print_error conf code msg =
+  let piqi_error = Api_piqi.default_error () in
+  piqi_error.Api_piqi.Error.code <- code ;
+  piqi_error.Api_piqi.Error.message <- Opt.of_string msg ;
+  let data = Api_piqi_ext.gen_error piqi_error in
+  Output.status conf (from_piqi_status code) ;
+  print_result conf data ;
+  raise Exit
+
+let get_params conf parse =
+  match (p_getenvbin conf.env "data", p_getenvbin conf.env "input") with
+  | (Some d, Some "pb") -> parse d `pb
+  | (Some d, Some "json") -> parse d `json
+  | (Some d, Some "xml") -> parse d `xml
+  | _ -> assert false
+
+let get_params conf parse =
+  try get_params conf parse
+  with e -> print_error conf `bad_request (Printexc.to_string e)
+
 let piqi_fevent_name_of_fevent_name = function
   | Efam_Marriage -> `efam_marriage
   | Efam_NoMarriage -> `efam_no_marriage
diff --git a/src/api_util.ml b/src/api_util.ml
index 20503c3..732c01a 100644
--- a/src/api_util.ml
+++ b/src/api_util.ml
@@ -1586,26 +1586,6 @@ let person_node_map_lia conf base l =
            }))
          l)
 
-let from_piqi_status = function
-  | `bad_request -> Def.Bad_Request
-  | `unauthorized -> Def.Unauthorized
-  | `forbidden -> Def.Forbidden
-  | `not_found -> Def.Not_Found
-  | `conflict -> Def.Conflict
-
-(** [print_error conf code]
-    Print error code and [raise Exit]
-*)
-let print_error conf code msg =
-  let piqi_error = M.default_error () in
-  piqi_error.M.Error.code <- code ;
-  piqi_error.M.Error.message <- Opt.of_string msg ;
-  let data = Mext.gen_error piqi_error in
-  Output.status conf (from_piqi_status code) ;
-  print_result conf data ;
-  raise Exit
-
-
 let chop_base_prefix base_prefix =
   let len = String.length base_prefix in
   if len > 2 &&
@@ -1614,3 +1594,5 @@ let chop_base_prefix base_prefix =
   then
     String.sub base_prefix 0 (len - 2)
   else base_prefix
+
+let print_error = Api_piqi_util.print_error