[PATCH 08 of 15] Upstream: keepalive flag

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1297818715 -10800
# Node ID 541f6cb00f1f5d5a93f5e272b4121585c2364417
# Parent  657ec1945f55f25b5fa4913b1acd2f8f310f9283
Upstream: keepalive flag.

This patch introduces r->upstream->keepalive flag, which is set by protocol
handlers if connection to upstream is in good state and can be kept alive.

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1297,6 +1297,8 @@ ngx_http_upstream_reinit(ngx_http_reques
         return NGX_ERROR;
     }
 
+    u->keepalive = 0;
+
     ngx_memzero(&u->headers_in, sizeof(ngx_http_upstream_headers_in_t));
     u->headers_in.content_length_n = -1;
 
@@ -2006,6 +2008,11 @@ ngx_http_upstream_process_body_in_memory
         }
     }
 
+    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;
diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h
@@ -308,6 +308,7 @@ struct ngx_http_upstream_s {
 #endif
 
     unsigned                         buffering:1;
+    unsigned                         keepalive:1;
 
     unsigned                         request_sent:1;
     unsigned                         header_sent:1;