--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -416,6 +416,12 @@ struct ngx_http_request_s {
 
     ngx_http_cleanup_t               *cleanup;
 
+    unsigned                          subrequests:8;
+    unsigned                          count:8;
+    unsigned                          blocked:8;
+
+    unsigned                          aio:1;
+
     unsigned                          http_state:4;
 
     /* URI with "/." and on Win32 with "//" */
@@ -502,11 +508,24 @@ struct ngx_http_request_s {
     unsigned                          stat_writing:1;
 #endif
 
-    unsigned                          subrequests:8;
-
     /* used to parse HTTP headers */
 
     ngx_uint_t                        state;
+
+    ngx_uint_t                        header_hash;
+    ngx_uint_t                        lowcase_index;
+    u_char                            lowcase_header[NGX_HTTP_LC_HEADER_LEN];
+
+    u_char                           *header_name_start;
+    u_char                           *header_name_end;
+    u_char                           *header_start;
+    u_char                           *header_end;
+
+    /*
+     * a memory that can be reused after parsing a request line
+     * via ngx_http_ephemeral_t
+     */
+
     u_char                           *uri_start;
     u_char                           *uri_end;
     u_char                           *uri_ext;
@@ -520,18 +539,18 @@ struct ngx_http_request_s {
     u_char                           *host_end;
     u_char                           *port_start;
     u_char                           *port_end;
-    u_char                           *header_name_start;
-    u_char                           *header_name_end;
-    u_char                           *header_start;
-    u_char                           *header_end;
 
     unsigned                          http_minor:16;
     unsigned                          http_major:16;
+};
 
-    ngx_uint_t                        header_hash;
-    ngx_uint_t                        lowcase_index;
-    u_char                            lowcase_header[NGX_HTTP_LC_HEADER_LEN];
-};
+
+typedef struct {
+    ngx_http_posted_request_t         terminal_posted_request;
+#if (NGX_HAVE_AIO_SENDFILE)
+    u_char                            aio_preload;
+#endif
+} ngx_http_ephemeral_t;
 
 
 extern ngx_http_header_t       ngx_http_headers_in[];