new file mode 100644
--- /dev/null
+++ b/config
@@ -0,0 +1,10 @@
+# (C) Maxim Dounin
+# Configuration for ngx_http_bytes_filter_module.
+
+ngx_addon_name="ngx_http_bytes_filter_module"
+
+HTTP_RANGE_BODY_FILTER_MODULE="$HTTP_RANGE_BODY_FILTER_MODULE \
+		ngx_http_bytes_filter_module"
+
+NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
+		$ngx_addon_dir/ngx_http_bytes_filter_module.c"

new file mode 100644
--- /dev/null
+++ b/ngx_http_bytes_filter_module.c
@@ -0,0 +1,219 @@
+
+/*
+ * Copyright (C) Maxim Dounin
+ */
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+typedef struct {
+    ngx_flag_t  enable;
+} ngx_http_bytes_conf_t;
+
+
+typedef struct {
+    off_t        start;
+    off_t        end;
+} ngx_http_bytes_t;
+
+
+typedef struct {
+    off_t        offset;
+    ngx_array_t  ranges;
+} ngx_http_bytes_ctx_t;
+
+
+static void *ngx_http_bytes_create_conf(ngx_conf_t *cf);
+static char *ngx_http_bytes_merge_conf(ngx_conf_t *cf, void *parent,
+    void *child);
+static ngx_int_t ngx_http_bytes_init(ngx_conf_t *cf);
+
+
+static ngx_command_t  ngx_http_bytes_commands[] = {
+
+    { ngx_string("bytes"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
+      ngx_conf_set_flag_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_bytes_conf_t, enable),
+      NULL },
+
+      ngx_null_command
+};
+
+
+static ngx_http_module_t  ngx_http_bytes_module_ctx = {
+    NULL,                          /* preconfiguration */
+    ngx_http_bytes_init,           /* postconfiguration */
+
+    NULL,                          /* create main configuration */
+    NULL,                          /* init main configuration */
+
+    NULL,                          /* create server configuration */
+    NULL,                          /* merge server configuration */
+
+    ngx_http_bytes_create_conf,    /* create location configuration */
+    ngx_http_bytes_merge_conf      /* merge location configuration */
+};
+
+
+ngx_module_t  ngx_http_bytes_filter_module = {
+    NGX_MODULE_V1,
+    &ngx_http_bytes_module_ctx,    /* module context */
+    ngx_http_bytes_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_http_output_header_filter_pt  ngx_http_next_header_filter;
+static ngx_http_output_body_filter_pt    ngx_http_next_body_filter;
+
+
+static ngx_int_t
+ngx_http_bytes_header_filter(ngx_http_request_t *r)
+{
+    u_char                 *p;
+    ngx_http_bytes_conf_t  *conf;
+    ngx_http_bytes_ctx_t   *ctx;
+
+    conf = ngx_http_get_module_loc_conf(r, ngx_http_bytes_filter_module);
+
+    if (!conf->enable || r->args.len == 0) {
+        return ngx_http_next_header_filter(r);
+    }
+
+    p = (u_char *) ngx_strnstr(r->args.data, "bytes=", r->args.len);
+
+    if (p == NULL) {
+        return ngx_http_next_header_filter(r);
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "bytes header filter: r %p", r);
+
+    p += sizeof("bytes=") - 1;
+
+    /* create context */
+
+    ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_bytes_ctx_t));
+    if (ctx == NULL) {
+        return NGX_ERROR;
+    }
+
+    if (ngx_array_init(&ctx->ranges, r->pool, 1, sizeof(ngx_http_bytes_t))
+        == NGX_ERROR)
+    {
+        return NGX_ERROR;
+    }
+
+    /*
+     * bytes= contain ranges compatible with RFC 2616, "14.35.1 Byte Ranges",
+     * but no whitespaces permitted
+     */
+
+#if 0
+    for ( ;; ) {
+        start = 0;
+        end = 0;
+        suffix = 0;
+
+        if (*p != '-') {
+            if (*p < '0' || *p > '9') {
+                break;
+            }
+
+            while (*p >= '0' && *p <= '9') {
+                start = start * 10 + *p++ - '0';
+            }
+
+            if (*p != '-') {
+                break;
+            }
+
+            if (*p == ',' || *p == '\0') {
+                /* no last-byte-pos, assume end of file */
+                end = len - 1;
+            }
+
+        } else {
+            suffix = 1;
+            p++;
+        }
+    }
+#endif
+
+    /* ... */
+
+    ngx_http_set_ctx(r, ctx, ngx_http_bytes_filter_module);
+
+    return ngx_http_next_header_filter(r);
+}
+
+
+static ngx_int_t
+ngx_http_bytes_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
+{
+    ngx_http_bytes_ctx_t  *ctx;
+
+    ctx = ngx_http_get_module_ctx(r, ngx_http_bytes_filter_module);
+
+    if (ctx == NULL) {
+        return ngx_http_next_body_filter(r, in);
+    }
+
+    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "bytes body filter: r %p, in %p", r, in);
+
+    return ngx_http_next_body_filter(r, in);
+}
+
+
+static void *
+ngx_http_bytes_create_conf(ngx_conf_t *cf)
+{
+    ngx_http_bytes_conf_t  *conf;
+
+    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_bytes_conf_t));
+    if (conf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    conf->enable = NGX_CONF_UNSET;
+
+    return conf;
+}
+
+
+static char *
+ngx_http_bytes_merge_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+    ngx_http_bytes_conf_t *prev = parent;
+    ngx_http_bytes_conf_t *conf = child;
+
+    ngx_conf_merge_value(conf->enable, prev->enable, 0);
+
+    return NGX_CONF_OK;
+}
+
+
+static ngx_int_t
+ngx_http_bytes_init(ngx_conf_t *cf)
+{
+    ngx_http_next_header_filter = ngx_http_top_header_filter;
+    ngx_http_top_header_filter = ngx_http_bytes_header_filter;
+
+    ngx_http_next_body_filter = ngx_http_top_body_filter;
+    ngx_http_top_body_filter = ngx_http_bytes_body_filter;
+
+    return NGX_OK;
+}