new file mode 100644
--- /dev/null
+++ b/src/stream/ngx_stream_set_module.c
@@ -0,0 +1,226 @@
+
+/*
+ * Copyright (C) Pavel Pautov
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_stream.h>
+
+
+typedef struct {
+    ngx_int_t                   index;
+    ngx_stream_set_variable_pt  set_handler;
+    uintptr_t                   data;
+    ngx_stream_complex_value_t  value;
+} ngx_stream_set_cmd_t;
+
+
+typedef struct {
+    ngx_array_t                 commands;
+} ngx_stream_set_srv_conf_t;
+
+
+static ngx_int_t ngx_stream_set_handler(ngx_stream_session_t *s);
+static ngx_int_t ngx_stream_set_var(ngx_stream_session_t *s,
+    ngx_stream_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_stream_set_init(ngx_conf_t *cf);
+static void *ngx_stream_set_create_srv_conf(ngx_conf_t *cf);
+static char *ngx_stream_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
+
+
+static ngx_command_t  ngx_stream_set_commands[] = {
+
+    { ngx_string("set"),
+      NGX_STREAM_SRV_CONF|NGX_CONF_TAKE2,
+      ngx_stream_set,
+      NGX_STREAM_SRV_CONF_OFFSET,
+      0,
+      NULL },
+
+      ngx_null_command
+};
+
+
+static ngx_stream_module_t  ngx_stream_set_module_ctx = {
+    NULL,                                  /* preconfiguration */
+    ngx_stream_set_init,                   /* postconfiguration */
+
+    NULL,                                  /* create main configuration */
+    NULL,                                  /* init main configuration */
+
+    ngx_stream_set_create_srv_conf,        /* create server configuration */
+    NULL                                   /* merge server configuration */
+};
+
+
+ngx_module_t  ngx_stream_set_module = {
+    NGX_MODULE_V1,
+    &ngx_stream_set_module_ctx,            /* module context */
+    ngx_stream_set_commands,               /* module directives */
+    NGX_STREAM_MODULE,                     /* module type */
+    NULL,                                  /* init master */
+    NULL,                                  /* init module */
+    NULL,                                  /* init process */
+    NULL,                                  /* init thread */
+    NULL,                                  /* exit thread */
+    NULL,                                  /* exit process */
+    NULL,                                  /* exit master */
+    NGX_MODULE_V1_PADDING
+};
+
+
+static ngx_int_t
+ngx_stream_set_handler(ngx_stream_session_t *s)
+{
+    ngx_str_t                     str;
+    ngx_uint_t                    i;
+    ngx_stream_set_cmd_t         *cmds;
+    ngx_stream_set_srv_conf_t    *scf;
+    ngx_stream_variable_value_t   vv;
+
+    scf = ngx_stream_get_module_srv_conf(s, ngx_stream_set_module);
+    cmds = scf->commands.elts;
+    vv = ngx_stream_variable_null_value;
+
+    for (i = 0; i < scf->commands.nelts; i++) {
+        if (ngx_stream_complex_value(s, &cmds[i].value, &str) != NGX_OK) {
+            return NGX_ERROR;
+        }
+
+        if (cmds[i].set_handler != NULL) {
+            vv.len = str.len;
+            vv.data = str.data;
+            cmds[i].set_handler(s, &vv, cmds[i].data);
+
+        } else {
+            s->variables[cmds[i].index].len = str.len;
+            s->variables[cmds[i].index].valid = 1;
+            s->variables[cmds[i].index].no_cacheable = 0;
+            s->variables[cmds[i].index].not_found = 0;
+            s->variables[cmds[i].index].data = str.data;
+        }
+    }
+
+    return NGX_DECLINED;
+}
+
+
+static ngx_int_t
+ngx_stream_set_var(ngx_stream_session_t *s, ngx_stream_variable_value_t *v,
+    uintptr_t data)
+{
+    *v = ngx_stream_variable_null_value;
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
+ngx_stream_set_init(ngx_conf_t *cf)
+{
+    ngx_stream_handler_pt        *h;
+    ngx_stream_core_main_conf_t  *cmcf;
+
+    cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
+
+    h = ngx_array_push(&cmcf->phases[NGX_STREAM_PREACCESS_PHASE].handlers);
+    if (h == NULL) {
+        return NGX_ERROR;
+    }
+
+    *h = ngx_stream_set_handler;
+
+    return NGX_OK;
+}
+
+
+static void *
+ngx_stream_set_create_srv_conf(ngx_conf_t *cf)
+{
+    ngx_stream_set_srv_conf_t  *conf;
+
+    conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_set_srv_conf_t));
+    if (conf == NULL) {
+        return NULL;
+    }
+
+    /*
+     * set by ngx_pcalloc():
+     *
+     *     conf->commands = { NULL };
+     */
+
+    return conf;
+}
+
+
+static char *
+ngx_stream_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_stream_set_srv_conf_t  *scf = conf;
+
+    ngx_str_t                           *args;
+    ngx_int_t                            index;
+    ngx_stream_set_cmd_t                *set_cmd;
+    ngx_stream_variable_t               *v;
+    ngx_stream_compile_complex_value_t   ccv;
+
+    args = cf->args->elts;
+
+    if (args[1].data[0] != '$') {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid variable name \"%V\"", &args[1]);
+        return NGX_CONF_ERROR;
+    }
+
+    args[1].len--;
+    args[1].data++;
+
+    v = ngx_stream_add_variable(cf, &args[1],
+                                NGX_STREAM_VAR_CHANGEABLE|NGX_STREAM_VAR_WEAK);
+    if (v == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    index = ngx_stream_get_variable_index(cf, &args[1]);
+    if (index == NGX_ERROR) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (v->get_handler == NULL) {
+        v->get_handler = ngx_stream_set_var;
+    }
+
+    if (scf->commands.elts == NULL) {
+        if (ngx_array_init(&scf->commands, cf->pool, 1,
+                           sizeof(ngx_stream_set_cmd_t))
+            != NGX_OK)
+        {
+            return NGX_CONF_ERROR;
+        }
+    }
+
+    set_cmd = ngx_array_push(&scf->commands);
+    if (set_cmd == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    set_cmd->index = index;
+    set_cmd->set_handler = v->set_handler;
+    set_cmd->data = v->data;
+
+    ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t));
+
+    ccv.cf = cf;
+    ccv.value = &args[2];
+    ccv.complex_value = &set_cmd->value;
+
+    if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) {
+        return NGX_CONF_ERROR;
+    }
+
+    return NGX_CONF_OK;
+}