diff --git a/cmd.c b/cmd.c
index f769dbf..24199a0 100644
--- a/cmd.c
+++ b/cmd.c
@@ -112,7 +112,7 @@ cmd_run(struct server *s, struct evhttp_request *rq,
 	evhttp_parse_query(uri, &cmd->uri_params);
 
 	/* get output formatting function */
-	uri_len = cmd_read_params(cmd, uri, uri_len, &f_format);
+	uri_len = cmd_select_format(cmd, uri, uri_len, &f_format);
 
 	/* check if we only have one command or more. */
 	slash = memchr(uri, '/', uri_len);
@@ -135,9 +135,9 @@ cmd_run(struct server *s, struct evhttp_request *rq,
 	/* check if we have to split the connection */
 	if(cmd_is_subscribe(cmd)) {
 		struct pubsub_client *ps;
+
 		ps = calloc(1, sizeof(struct pubsub_client));
 		ps->s = s = server_copy(s);
-
 		ps->rq = rq;
 
 		evhttp_connection_set_closecb(rq->evcon, on_http_disconnect, ps);
@@ -177,17 +177,24 @@ cmd_run(struct server *s, struct evhttp_request *rq,
 	return 0;
 }
 
+
 /**
- * Return 2 functions, one to format the reply and
- * one to transform the command before processing it.
+ * Select Content-Type and processing function.
  */
 int
-cmd_read_params(struct cmd *cmd, const char *uri, size_t uri_len, formatting_fun *f_format) {
+cmd_select_format(struct cmd *cmd, const char *uri, size_t uri_len, formatting_fun *f_format) {
 
 	const char *ext;
 	int ext_len = -1;
 	unsigned int i;
 
+	/* those are the available reply formats */
+	struct reply_format {
+		const char *s;
+		size_t sz;
+		formatting_fun f;
+		const char *ct;
+	};
 	struct reply_format funs[] = {
 		{.s = "json", .sz = 4, .f = json_reply, .ct = "application/json"},
 		{.s = "raw", .sz = 3, .f = raw_reply, .ct = "binary/octet-stream"},
@@ -196,7 +203,7 @@ cmd_read_params(struct cmd *cmd, const char *uri, size_t uri_len, formatting_fun
 		{.s = "png", .sz = 3, .f = custom_type_reply, .ct = "image/png"},
 	};
 
-	/* defaults */
+	/* default */
 	*f_format = json_reply;
 
 	/* find extension */
@@ -207,7 +214,7 @@ cmd_read_params(struct cmd *cmd, const char *uri, size_t uri_len, formatting_fun
 			break;
 		}
 	}
-	if(!ext_len) return uri_len;
+	if(!ext_len) return uri_len; /* nothing found */
 
 	/* find function for the given extension */
 	for(i = 0; i < sizeof(funs)/sizeof(funs[0]); ++i) {
diff --git a/cmd.h b/cmd.h
index cd94b2a..a477336 100644
--- a/cmd.h
+++ b/cmd.h
@@ -35,13 +35,6 @@ struct pubsub_client {
 	struct evhttp_request *rq;
 };
 
-struct reply_format {
-	const char *s;
-	size_t sz;
-	formatting_fun f;
-	const char *ct;
-};
-
 struct cmd *
 cmd_new(struct evhttp_request *rq, int count);
 
@@ -53,7 +46,7 @@ cmd_run(struct server *s, struct evhttp_request *rq,
 		const char *uri, size_t uri_len);
 
 int
-cmd_read_params(struct cmd *cmd, const char *uri, size_t uri_len, formatting_fun *f_format);
+cmd_select_format(struct cmd *cmd, const char *uri, size_t uri_len, formatting_fun *f_format);
 
 int
 cmd_is_subscribe(struct cmd *cmd);
diff --git a/formats/custom-type.c b/formats/custom-type.c
index c378440..a58ba7f 100644
--- a/formats/custom-type.c
+++ b/formats/custom-type.c
@@ -6,59 +6,35 @@
 #include <hiredis/hiredis.h>
 #include <hiredis/async.h>
 
-static void
-custom_400(struct cmd *cmd) {
-	evhttp_send_reply(cmd->rq, 400, "Bad request", NULL);
-	cmd_free(cmd);
-}
-
 void
 custom_type_reply(redisAsyncContext *c, void *r, void *privdata) {
 
 	redisReply *reply = r;
 	struct cmd *cmd = privdata;
-	char *ct;
 	(void)c;
 
 	evhttp_clear_headers(&cmd->uri_params);
 
-	if (reply == NULL) {
+	if(reply == NULL) {
 		evhttp_send_reply(cmd->rq, 404, "Not Found", NULL);
 		return;
 	}
 
-	if(cmd->mime) { /* use the given content-type */
+	if(cmd->mime) { /* use the given content-type, but only for strings */
 		switch(reply->type) {
 
-			case REDIS_REPLY_NIL:
+			case REDIS_REPLY_NIL: /* or nil values */
 				format_send_reply(cmd, "", 0, cmd->mime);
 				return;
 
 			case REDIS_REPLY_STRING:
 				format_send_reply(cmd, reply->str, reply->len, cmd->mime);
 				return;
-
-			default:
-				custom_400(cmd);
-				return;
 		}
 	}
 
-	/* we expect array(string, string) */
-	if(reply->type != REDIS_REPLY_ARRAY || reply->elements != 2 || reply->element[0]->type != REDIS_REPLY_STRING) {
-		custom_400(cmd);
-		return;
-	}
-
-	/* case of MGET, we need to have a string for content-type in element[1] */
-	if(reply->element[1]->type == REDIS_REPLY_STRING) {
-		ct = reply->element[1]->str;
-	} else {
-		ct = "binary/octet-stream";
-	}
-
-	/* send reply */
-	format_send_reply(cmd, reply->element[0]->str, reply->element[0]->len, ct);
-	return;
+	/* couldn't make sense of what the client wanted. */
+	evhttp_send_reply(cmd->rq, 400, "Bad request", NULL);
+	cmd_free(cmd);
 }
 
diff --git a/formats/raw.c b/formats/raw.c
index b6fdad7..33ce8a6 100644
--- a/formats/raw.c
+++ b/formats/raw.c
@@ -28,7 +28,7 @@ raw_reply(redisAsyncContext *c, void *r, void *privdata) {
 	raw_out = raw_wrap(r, &sz);
 
 	/* send reply */
-	format_send_reply(cmd, raw_out, sz, cmd->mime?cmd->mime:"binary/octet-stream");
+	format_send_reply(cmd, raw_out, sz, "binary/octet-stream");
 
 	/* cleanup */
 	free(raw_out);