--- a/src/http/ngx_http_copy_filter_module.c
+++ b/src/http/ngx_http_copy_filter_module.c
@@ -118,15 +118,19 @@ ngx_http_copy_filter(ngx_http_request_t 
         ctx->filter_ctx = r;
 
 #if (NGX_HAVE_FILE_AIO)
-        if (ngx_file_aio && clcf->aio) {
-            ctx->aio_handler = ngx_http_copy_aio_handler;
+        if (ngx_file_aio) {
+            if (clcf->aio) {
+                ctx->aio_handler = ngx_http_copy_aio_handler;
+            }
 #if (NGX_HAVE_AIO_SENDFILE)
             c->aio_sendfile = (clcf->aio == NGX_HTTP_AIO_SENDFILE);
 #endif
         }
 #endif
 
-        r->request_output = 1;
+        if (in && in->buf && ngx_buf_size(in->buf)) {
+            r->request_output = 1;
+        }
     }
 
 #if (NGX_HAVE_FILE_AIO)
@@ -209,6 +213,7 @@ ngx_http_copy_aio_handler(ngx_output_cha
 
     r->main->blocked++;
     r->aio = 1;
+    ctx->aio = 1;
 }