[nginx] Upstream: skip empty cache headers.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/e68af4e3396f
branches:  
changeset: 5451:e68af4e3396f
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Fri Nov 29 17:23:38 2013 +0400
description:
Upstream: skip empty cache headers.

Notably this fixes HTTP_IF_MODIFIED_SINCE which was always sent with
cache enabled in fastcgi/scgi/uwsgi after 43ccaf8e8728.

diffstat:

 src/http/modules/ngx_http_fastcgi_module.c |  2 +-
 src/http/modules/ngx_http_scgi_module.c    |  2 +-
 src/http/modules/ngx_http_uwsgi_module.c   |  2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diffs (36 lines):

diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -2769,7 +2769,7 @@ ngx_http_fastcgi_merge_params(ngx_conf_t
 
             s->key = h->key;
             s->value = h->value;
-            s->skip_empty = 0;
+            s->skip_empty = 1;
 
         next:
 
diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -1506,7 +1506,7 @@ ngx_http_scgi_merge_params(ngx_conf_t *c
 
             s->key = h->key;
             s->value = h->value;
-            s->skip_empty = 0;
+            s->skip_empty = 1;
 
         next:
 
diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -1548,7 +1548,7 @@ ngx_http_uwsgi_merge_params(ngx_conf_t *
 
             s->key = h->key;
             s->value = h->value;
-            s->skip_empty = 0;
+            s->skip_empty = 1;
 
         next: