[nginx] Cache: increased cache header Vary and ETag lengths to 128.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/609daeb3b48b
branches:  
changeset: 6908:609daeb3b48b
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Fri Feb 10 17:49:19 2017 +0300
description:
Cache: increased cache header Vary and ETag lengths to 128.

This allows to store larger ETag values for proxy_cache_revalidate,
including ones generated as SHA256, and cache responses with longer
Vary (ticket #826).

In particular, this fixes caching of Amazon S3 responses with CORS
enabled, which now use "Vary: Origin, Access-Control-Request-Headers,
Access-Control-Request-Method".

Cache version bumped accordingly.

diffstat:

 src/http/ngx_http_cache.h |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (17 lines):

diff --git a/src/http/ngx_http_cache.h b/src/http/ngx_http_cache.h
--- a/src/http/ngx_http_cache.h
+++ b/src/http/ngx_http_cache.h
@@ -24,10 +24,10 @@
 #define NGX_HTTP_CACHE_SCARCE        8
 
 #define NGX_HTTP_CACHE_KEY_LEN       16
-#define NGX_HTTP_CACHE_ETAG_LEN      42
-#define NGX_HTTP_CACHE_VARY_LEN      42
+#define NGX_HTTP_CACHE_ETAG_LEN      128
+#define NGX_HTTP_CACHE_VARY_LEN      128
 
-#define NGX_HTTP_CACHE_VERSION       4
+#define NGX_HTTP_CACHE_VERSION       5
 
 
 typedef struct {