diff --git a/src/http/ngx_http_copy_filter_module.c b/src/http/ngx_http_copy_filter_module.c
index c96dbfa76..3069779c2 100644
--- a/src/http/ngx_http_copy_filter_module.c
+++ b/src/http/ngx_http_copy_filter_module.c
@@ -117,6 +117,10 @@ ngx_http_copy_filter(ngx_http_request_t *r, ngx_chain_t *in)
             r->buffered |= NGX_HTTP_COPY_BUFFERED;
         }
 
+        if (r != r->main) {
+            r->out = ctx->in;
+        }
+
 #if (NGX_DEBUG)
         ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                        "copy filter: %i \"%V?%V\"", rc, &r->uri, &r->args);
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 392783664..c1bae266c 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2157,8 +2157,17 @@ ngx_http_upstream_finalize_request(ngx_http_request_t *r,
 
     r->connection->log->action = "sending to client";
 
-    if (rc == 0 && r == r->main && !r->post_action) {
-        rc = ngx_http_send_special(r, NGX_HTTP_LAST);
+    if (rc == 0) {
+        if (r == r->main) {
+            if (!r->post_action) {
+                rc = ngx_http_send_special(r, NGX_HTTP_LAST);
+            }
+
+        } else {
+            if (r->out) {
+                rc = NGX_AGAIN;
+            }
+        }
     }
 
     ngx_http_finalize_request(r, rc);