diff --git a/src/http/modules/ngx_http_addition_filter_module.c b/src/http/modules/ngx_http_addition_filter_module.c
index c78361c..9b22a0a 100644
--- a/src/http/modules/ngx_http_addition_filter_module.c
+++ b/src/http/modules/ngx_http_addition_filter_module.c
@@ -237,8 +237,8 @@
     ngx_conf_merge_str_value(conf->before_body, prev->before_body, "");
     ngx_conf_merge_str_value(conf->after_body, prev->after_body, "");
 
-    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
-                             prev->types_keys, &prev->types,
+    if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
+                             &prev->types_keys, &prev->types,
                              ngx_http_html_default_types)
         != NGX_OK)
     {
diff --git a/src/http/modules/ngx_http_charset_filter_module.c b/src/http/modules/ngx_http_charset_filter_module.c
index a764991..a6f9afc 100644
--- a/src/http/modules/ngx_http_charset_filter_module.c
+++ b/src/http/modules/ngx_http_charset_filter_module.c
@@ -1550,8 +1550,8 @@
     ngx_http_charset_recode_t     *recode;
     ngx_http_charset_main_conf_t  *mcf;
 
-    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
-                             prev->types_keys, &prev->types,
+    if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
+                             &prev->types_keys, &prev->types,
                              ngx_http_charset_default_types)
         != NGX_OK)
     {
diff --git a/src/http/modules/ngx_http_gzip_filter_module.c b/src/http/modules/ngx_http_gzip_filter_module.c
index 337700c..19835b6 100644
--- a/src/http/modules/ngx_http_gzip_filter_module.c
+++ b/src/http/modules/ngx_http_gzip_filter_module.c
@@ -1123,8 +1123,8 @@
                               MAX_MEM_LEVEL - 1);
     ngx_conf_merge_value(conf->min_length, prev->min_length, 20);
 
-    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
-                             prev->types_keys, &prev->types,
+    if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
+                             &prev->types_keys, &prev->types,
                              ngx_http_html_default_types)
         != NGX_OK)
     {
diff --git a/src/http/modules/ngx_http_ssi_filter_module.c b/src/http/modules/ngx_http_ssi_filter_module.c
index 1b9a3a0..2520cdb 100644
--- a/src/http/modules/ngx_http_ssi_filter_module.c
+++ b/src/http/modules/ngx_http_ssi_filter_module.c
@@ -2773,8 +2773,8 @@
     ngx_conf_merge_size_value(conf->min_file_chunk, prev->min_file_chunk, 1024);
     ngx_conf_merge_size_value(conf->value_len, prev->value_len, 256);
 
-    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
-                             prev->types_keys, &prev->types,
+    if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
+                             &prev->types_keys, &prev->types,
                              ngx_http_html_default_types)
         != NGX_OK)
     {
diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
index 9f07881..fe4d927 100644
--- a/src/http/modules/ngx_http_sub_filter_module.c
+++ b/src/http/modules/ngx_http_sub_filter_module.c
@@ -671,8 +671,8 @@
         conf->value = prev->value;
     }
 
-    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
-                             prev->types_keys, &prev->types,
+    if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
+                             &prev->types_keys, &prev->types,
                              ngx_http_html_default_types)
         != NGX_OK)
     {
diff --git a/src/http/modules/ngx_http_xslt_filter_module.c b/src/http/modules/ngx_http_xslt_filter_module.c
index c14d1c4..528a187 100644
--- a/src/http/modules/ngx_http_xslt_filter_module.c
+++ b/src/http/modules/ngx_http_xslt_filter_module.c
@@ -1230,8 +1230,8 @@
         conf->sheets = prev->sheets;
     }
 
-    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
-                             prev->types_keys, &prev->types,
+    if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
+                             &prev->types_keys, &prev->types,
                              ngx_http_xslt_default_types)
         != NGX_OK)
     {
diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 5b4aa00..0a91d67 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -1854,6 +1854,10 @@
 
     types = (ngx_array_t **) (p + cmd->offset);
 
+    if (*types == (void *) -1) {
+        return NGX_CONF_OK;
+    }
+
     default_type = cmd->post;
 
     if (*types == NULL) {
@@ -1879,6 +1883,11 @@
 
     for (i = 1; i < cf->args->nelts; i++) {
 
+        if (value[i].len == 1 && value[i].data[0] == '*') {
+            *types = (void *) -1;
+            return NGX_CONF_OK;
+        }
+
         hash = ngx_hash_strlow(value[i].data, value[i].data, value[i].len);
         value[i].data[value[i].len] = '\0';
 
@@ -1907,13 +1916,17 @@
 
 
 char *
-ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t *keys, ngx_hash_t *types_hash,
-    ngx_array_t *prev_keys, ngx_hash_t *prev_types_hash,
+ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t **keys, ngx_hash_t *types_hash,
+    ngx_array_t **prev_keys, ngx_hash_t *prev_types_hash,
     ngx_str_t *default_types)
 {
     ngx_hash_init_t  hash;
 
-    if (keys) {
+    if (*keys) {
+
+        if (*keys == (void *) -1) {
+            return NGX_CONF_OK;
+        }
 
         hash.hash = types_hash;
         hash.key = NULL;
@@ -1923,7 +1936,7 @@
         hash.pool = cf->pool;
         hash.temp_pool = NULL;
 
-        if (ngx_hash_init(&hash, keys->elts, keys->nelts) != NGX_OK) {
+        if (ngx_hash_init(&hash, (*keys)->elts, (*keys)->nelts) != NGX_OK) {
             return NGX_CONF_ERROR;
         }
 
@@ -1932,13 +1945,17 @@
 
     if (prev_types_hash->buckets == NULL) {
 
-        if (prev_keys == NULL) {
+        if (*prev_keys == NULL) {
 
-            if (ngx_http_set_default_types(cf, &prev_keys, default_types)
+            if (ngx_http_set_default_types(cf, prev_keys, default_types)
                 != NGX_OK)
             {
                 return NGX_CONF_ERROR;
             }
+
+        } else if (*prev_keys == (void *) -1) {
+            *keys = *prev_keys;
+            return NGX_CONF_OK;
         }
 
         hash.hash = prev_types_hash;
@@ -1949,7 +1966,9 @@
         hash.pool = cf->pool;
         hash.temp_pool = NULL;
 
-        if (ngx_hash_init(&hash, prev_keys->elts, prev_keys->nelts) != NGX_OK) {
+        if (ngx_hash_init(&hash, (*prev_keys)->elts, (*prev_keys)->nelts)
+            != NGX_OK)
+        {
             return NGX_CONF_ERROR;
         }
     }
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index 08bea59..b717c80 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -126,9 +126,9 @@
 
 
 char *ngx_http_types_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
-char *ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t *keys,
-    ngx_hash_t *types_hash, ngx_array_t *prev_keys, ngx_hash_t *prev_types_hash,
-    ngx_str_t *default_types);
+char *ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t **keys,
+    ngx_hash_t *types_hash, ngx_array_t **prev_keys,
+    ngx_hash_t *prev_types_hash, ngx_str_t *default_types);
 ngx_int_t ngx_http_set_default_types(ngx_conf_t *cf, ngx_array_t **types,
     ngx_str_t *default_type);
 
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index b88df33..1766e12 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1572,6 +1572,10 @@
     size_t      len;
     ngx_uint_t  i, hash;
 
+    if (types_hash->size == 0) {
+        return (void *) 4;
+    }
+
     if (r->headers_out.content_type.len == 0) {
         return NULL;
     }