new file mode 100644
--- /dev/null
+++ b/src/http/modules/ngx_http_empty_gif_module.c
@@ -0,0 +1,173 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+static char *ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+
+static ngx_command_t  ngx_http_empty_gif_commands[] = {
+
+    { ngx_string("empty_gif"),
+      NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
+      ngx_http_empty_gif,
+      0,
+      0,
+      NULL },
+
+      ngx_null_command
+};
+
+
+/* the minimal single pixel transparent GIF, 43 bytes */
+
+static u_char  ngx_empty_gif[] = {
+
+    'G', 'I', 'F', '8', '9', 'a',  /* header */
+
+                                   /* logical screen descriptor */
+    0x01, 0x00,                    /* logical screen width */
+    0x01, 0x00,                    /* logical screen height */
+    0x80,                          /* global 1-bit color table */
+    0x01,                          /* background color #1 */
+    0x00,                          /* no aspect ratio */
+
+                                   /* global color table */
+    0x00, 0x00, 0x00,              /* #0: black */
+    0xff, 0xff, 0xff,              /* #1: white */
+
+                                   /* graphic control extension */
+    0x21,                          /* extension introducer */
+    0xf9,                          /* graphic control label */
+    0x04,                          /* block size */
+    0x01,                          /* transparent color is given, */
+                                   /*     no disposal specified, */
+                                   /*     user input is not expected */
+    0x00, 0x00,                    /* delay time */
+    0x01,                          /* transparent color #1 */
+    0x00,                          /* block terminator */
+
+                                   /* image descriptor */
+    0x2c,                          /* image separator */
+    0x00, 0x00,                    /* image left position */
+    0x00, 0x00,                    /* image top position */
+    0x01, 0x00,                    /* image width */
+    0x01, 0x00,                    /* image height */
+    0x00,                          /* no local color table, no interlaced */
+
+                                   /* table based image data */
+    0x02,                          /* LZW minimum code size, */
+                                   /*     must be at least 2-bit */
+    0x02,                          /* block size */
+    0x4c, 0x01,                    /* compressed bytes 01_001_100, 0000000_1 */
+                                   /* 100: clear code */
+                                   /* 001: 1 */
+                                   /* 101: end of information code */
+    0x00,                          /* block terminator */
+
+    0x3B                           /* trailer */
+};
+
+
+ngx_http_module_t  ngx_http_empty_gif_module_ctx = {
+    NULL,                          /* preconfiguration */
+    NULL,                          /* postconfiguration */
+
+    NULL,                          /* create main configuration */
+    NULL,                          /* init main configuration */
+
+    NULL,                          /* create server configuration */
+    NULL,                          /* merge server configuration */
+
+    NULL,                          /* create location configuration */
+    NULL                           /* merge location configuration */
+};
+
+
+ngx_module_t  ngx_http_empty_gif_module = {
+    NGX_MODULE_V1,
+    &ngx_http_empty_gif_module_ctx, /* module context */
+    ngx_http_empty_gif_commands,   /* module directives */
+    NGX_HTTP_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_http_empty_gif_handler(ngx_http_request_t *r)
+{
+    ngx_int_t     rc;
+    ngx_buf_t    *b;
+    ngx_chain_t   out;
+
+    if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
+        return NGX_HTTP_NOT_ALLOWED;
+    }
+
+    rc = ngx_http_discard_body(r);
+
+    if (rc != NGX_OK && rc != NGX_AGAIN) {
+        return rc;
+    }
+
+    r->headers_out.content_type.len = sizeof("image/gif") - 1;
+    r->headers_out.content_type.data = (u_char *) "image/gif";
+
+    if (r->method == NGX_HTTP_HEAD) {
+        r->headers_out.status = NGX_HTTP_OK;
+
+        rc = ngx_http_send_header(r);
+
+        if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
+            return rc;
+        }
+    }
+
+    b = ngx_create_temp_buf(r->pool, sizeof(ngx_empty_gif));
+    if (b == NULL) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    out.buf = b;
+    out.next = NULL;
+
+    b->pos = ngx_empty_gif;
+    b->last = ngx_empty_gif + sizeof(ngx_empty_gif);
+    b->last_buf = 1;
+
+    r->headers_out.status = NGX_HTTP_OK;
+    r->headers_out.content_length_n = b->last - b->pos;
+    r->headers_out.last_modified_time = 23349600;
+
+    rc = ngx_http_send_header(r);
+
+    if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
+        return rc;
+    }
+
+    return ngx_http_output_filter(r, &out);;
+}
+
+
+static char *
+ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_http_core_loc_conf_t  *clcf;
+
+    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
+    clcf->handler = ngx_http_empty_gif_handler;
+
+    return NGX_CONF_OK;
+}