diff --git a/src/http/ngx_http_script.c b/src/http/ngx_http_script.c
index 415388904..f2f5a1ca8 100644
--- a/src/http/ngx_http_script.c
+++ b/src/http/ngx_http_script.c
@@ -104,6 +104,37 @@ ngx_http_complex_value(ngx_http_request_t *r, ngx_http_complex_value_t *val,
 }
 
 
+size_t
+ngx_http_complex_value_size(ngx_http_request_t *r,
+    ngx_http_complex_value_t *val, size_t default_value)
+{
+    size_t     size;
+    ngx_str_t  value;
+
+    if (val == NULL) {
+        return default_value;
+    }
+
+    if (val->lengths == NULL) {
+        return val->u.size;
+    }
+
+    if (ngx_http_complex_value(r, val, &value) != NGX_OK) {
+        return default_value;
+    }
+
+    size = ngx_parse_size(&value);
+
+    if (size == (size_t) NGX_ERROR) {
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                      "invalid size \"%V\"", &value);
+        return default_value;
+    }
+
+    return size;
+}
+
+
 ngx_int_t
 ngx_http_compile_complex_value(ngx_http_compile_complex_value_t *ccv)
 {
@@ -244,6 +275,36 @@ ngx_http_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 }
 
 
+char *
+ngx_http_set_complex_value_size_slot(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf)
+{
+    char  *p = conf;
+
+    char                      *rv;
+    ngx_http_complex_value_t  *cv;
+
+    rv = ngx_http_set_complex_value_slot(cf, cmd, conf);
+
+    if (rv != NGX_CONF_OK) {
+        return rv;
+    }
+
+    cv = *(ngx_http_complex_value_t **) (p + cmd->offset);
+
+    if (cv->lengths) {
+        return NGX_CONF_OK;
+    }
+
+    cv->u.size = ngx_parse_size(&cv->value);
+    if (cv->u.size == (size_t) NGX_ERROR) {
+        return "invalid value";
+    }
+
+    return NGX_CONF_OK;
+}
+
+
 ngx_int_t
 ngx_http_test_predicates(ngx_http_request_t *r, ngx_array_t *predicates)
 {
diff --git a/src/http/ngx_http_script.h b/src/http/ngx_http_script.h
index 25bb6d73f..a6b345e2d 100644
--- a/src/http/ngx_http_script.h
+++ b/src/http/ngx_http_script.h
@@ -68,6 +68,10 @@ typedef struct {
     ngx_uint_t                 *flushes;
     void                       *lengths;
     void                       *values;
+
+    union {
+        size_t                  size;
+    } u;
 } ngx_http_complex_value_t;
 
 
@@ -207,9 +211,13 @@ void ngx_http_script_flush_complex_value(ngx_http_request_t *r,
     ngx_http_complex_value_t *val);
 ngx_int_t ngx_http_complex_value(ngx_http_request_t *r,
     ngx_http_complex_value_t *val, ngx_str_t *value);
+size_t ngx_http_complex_value_size(ngx_http_request_t *r,
+    ngx_http_complex_value_t *val, size_t default_value);
 ngx_int_t ngx_http_compile_complex_value(ngx_http_compile_complex_value_t *ccv);
 char *ngx_http_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd,
     void *conf);
+char *ngx_http_set_complex_value_size_slot(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
 
 
 ngx_int_t ngx_http_test_predicates(ngx_http_request_t *r,
diff --git a/src/stream/ngx_stream_script.c b/src/stream/ngx_stream_script.c
index b00e7086f..a15f772b5 100644
--- a/src/stream/ngx_stream_script.c
+++ b/src/stream/ngx_stream_script.c
@@ -105,6 +105,37 @@ ngx_stream_complex_value(ngx_stream_session_t *s,
 }
 
 
+size_t
+ngx_stream_complex_value_size(ngx_stream_session_t *s,
+    ngx_stream_complex_value_t *val, size_t default_value)
+{
+    size_t     size;
+    ngx_str_t  value;
+
+    if (val == NULL) {
+        return default_value;
+    }
+
+    if (val->lengths == NULL) {
+        return val->u.size;
+    }
+
+    if (ngx_stream_complex_value(s, val, &value) != NGX_OK) {
+        return default_value;
+    }
+
+    size = ngx_parse_size(&value);
+
+    if (size == (size_t) NGX_ERROR) {
+        ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
+                      "invalid size \"%V\"", &value);
+        return default_value;
+    }
+
+    return size;
+}
+
+
 ngx_int_t
 ngx_stream_compile_complex_value(ngx_stream_compile_complex_value_t *ccv)
 {
@@ -246,6 +277,36 @@ ngx_stream_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd,
 }
 
 
+char *
+ngx_stream_set_complex_value_size_slot(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf)
+{
+    char  *p = conf;
+
+    char                        *rv;
+    ngx_stream_complex_value_t  *cv;
+
+    rv = ngx_stream_set_complex_value_slot(cf, cmd, conf);
+
+    if (rv != NGX_CONF_OK) {
+        return rv;
+    }
+
+    cv = *(ngx_stream_complex_value_t **) (p + cmd->offset);
+
+    if (cv->lengths) {
+        return NGX_CONF_OK;
+    }
+
+    cv->u.size = ngx_parse_size(&cv->value);
+    if (cv->u.size == (size_t) NGX_ERROR) {
+        return "invalid value";
+    }
+
+    return NGX_CONF_OK;
+}
+
+
 ngx_uint_t
 ngx_stream_script_variables_count(ngx_str_t *value)
 {
diff --git a/src/stream/ngx_stream_script.h b/src/stream/ngx_stream_script.h
index 25a450d2a..a481ca3ab 100644
--- a/src/stream/ngx_stream_script.h
+++ b/src/stream/ngx_stream_script.h
@@ -56,6 +56,10 @@ typedef struct {
     ngx_uint_t                   *flushes;
     void                         *lengths;
     void                         *values;
+
+    union {
+        size_t                    size;
+    } u;
 } ngx_stream_complex_value_t;
 
 
@@ -102,10 +106,14 @@ void ngx_stream_script_flush_complex_value(ngx_stream_session_t *s,
     ngx_stream_complex_value_t *val);
 ngx_int_t ngx_stream_complex_value(ngx_stream_session_t *s,
     ngx_stream_complex_value_t *val, ngx_str_t *value);
+size_t ngx_stream_complex_value_size(ngx_stream_session_t *s,
+    ngx_stream_complex_value_t *val, size_t default_value);
 ngx_int_t ngx_stream_compile_complex_value(
     ngx_stream_compile_complex_value_t *ccv);
 char *ngx_stream_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd,
     void *conf);
+char *ngx_stream_set_complex_value_size_slot(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
 
 
 ngx_uint_t ngx_stream_script_variables_count(ngx_str_t *value);