[PATCH 17 of 25] Cache: fix for sending of empty responses

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1315324516 -14400
# Node ID 2a8a9625e90d91f3a35a55472ad0770f8e02d96b
# Parent  844f42dbe78794bad20366b51b19ee9b9ed32853
Cache: fix for sending of empty responses.

Revert wrong fix for empty responses introduced in 0.8.31 and apply new one,
rewritten to match things done by static module as close as possible.

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -853,6 +853,10 @@ ngx_http_cache_send(ngx_http_request_t *
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http file cache send: %s", c->file.name.data);
 
+    if (r != r->main && c->length - c->body_start == 0) {
+        return ngx_http_send_header(r);
+    }
+
     /* we need to allocate all before the header would be sent */
 
     b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
@@ -865,8 +869,6 @@ ngx_http_cache_send(ngx_http_request_t *
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }
 
-    r->header_only = (c->length - c->body_start) == 0;
-
     rc = ngx_http_send_header(r);
 
     if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
@@ -876,7 +878,7 @@ ngx_http_cache_send(ngx_http_request_t *
     b->file_pos = c->body_start;
     b->file_last = c->length;
 
-    b->in_file = 1;
+    b->in_file = (c->length - c->body_start) ? 1: 0;
     b->last_buf = (r == r->main) ? 1: 0;
     b->last_in_chain = 1;