--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -55,8 +55,6 @@ static ngx_int_t ngx_http_upstream_inter
 static ngx_int_t ngx_http_upstream_test_connect(ngx_connection_t *c);
 static ngx_int_t ngx_http_upstream_process_headers(ngx_http_request_t *r,
     ngx_http_upstream_t *u);
-static void ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r,
-    ngx_http_upstream_t *u);
 static void ngx_http_upstream_send_response(ngx_http_request_t *r,
     ngx_http_upstream_t *u);
 static void ngx_http_upstream_upgrade(ngx_http_request_t *r,
@@ -2335,45 +2333,7 @@ ngx_http_upstream_process_header(ngx_htt
         return;
     }
 
-    if (!r->subrequest_in_memory) {
-        ngx_http_upstream_send_response(r, u);
-        return;
-    }
-
-    /* subrequest content in memory */
-
-    if (u->input_filter == NULL) {
-        u->input_filter_init = ngx_http_upstream_non_buffered_filter_init;
-        u->input_filter = ngx_http_upstream_non_buffered_filter;
-        u->input_filter_ctx = r;
-    }
-
-    if (u->input_filter_init(u->input_filter_ctx) == NGX_ERROR) {
-        ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
-        return;
-    }
-
-    n = u->buffer.last - u->buffer.pos;
-
-    if (n) {
-        u->buffer.last = u->buffer.pos;
-
-        u->state->response_length += n;
-
-        if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) {
-            ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
-            return;
-        }
-    }
-
-    if (u->length == 0) {
-        ngx_http_upstream_finalize_request(r, u, 0);
-        return;
-    }
-
-    u->read_event_handler = ngx_http_upstream_process_body_in_memory;
-
-    ngx_http_upstream_process_body_in_memory(r, u);
+    ngx_http_upstream_send_response(r, u);
 }
 
 
@@ -2776,84 +2736,6 @@ ngx_http_upstream_process_headers(ngx_ht
 
 
 static void
-ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r,
-    ngx_http_upstream_t *u)
-{
-    size_t             size;
-    ssize_t            n;
-    ngx_buf_t         *b;
-    ngx_event_t       *rev;
-    ngx_connection_t  *c;
-
-    c = u->peer.connection;
-    rev = c->read;
-
-    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
-                   "http upstream process body in memory");
-
-    if (rev->timedout) {
-        ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
-        ngx_http_upstream_finalize_request(r, u, NGX_HTTP_GATEWAY_TIME_OUT);
-        return;
-    }
-
-    b = &u->buffer;
-
-    for ( ;; ) {
-
-        size = b->end - b->last;
-
-        if (size == 0) {
-            ngx_log_error(NGX_LOG_ALERT, c->log, 0,
-                          "upstream buffer is too small to read response");
-            ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
-            return;
-        }
-
-        n = c->recv(c, b->last, size);
-
-        if (n == NGX_AGAIN) {
-            break;
-        }
-
-        if (n == 0 || n == NGX_ERROR) {
-            ngx_http_upstream_finalize_request(r, u, n);
-            return;
-        }
-
-        u->state->bytes_received += n;
-        u->state->response_length += n;
-
-        if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) {
-            ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
-            return;
-        }
-
-        if (!rev->ready) {
-            break;
-        }
-    }
-
-    if (u->length == 0) {
-        ngx_http_upstream_finalize_request(r, u, 0);
-        return;
-    }
-
-    if (ngx_handle_read_event(rev, 0) != NGX_OK) {
-        ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
-        return;
-    }
-
-    if (rev->active) {
-        ngx_add_timer(rev, u->conf->read_timeout);
-
-    } else if (rev->timer_set) {
-        ngx_del_timer(rev);
-    }
-}
-
-
-static void
 ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
 {
     ssize_t                    n;
@@ -4359,12 +4241,6 @@ ngx_http_upstream_finalize_request(ngx_h
 
 #endif
 
-    if (r->subrequest_in_memory
-        && u->headers_in.status_n >= NGX_HTTP_SPECIAL_RESPONSE)
-    {
-        u->buffer.last = u->buffer.pos;
-    }
-
     r->read_event_handler = ngx_http_block_reading;
 
     if (rc == NGX_DECLINED) {