Author: mdounin
Date: 2012-07-09 14:53:42 +0000 (Mon, 09 Jul 2012)
New Revision: 4750
URL: http://trac.nginx.org/nginx/changeset/4750/nginx

Log:
Entity tags: the "etag" directive.

It allows to disable generation of nginx's own entity tags, while
still handling ETags in cache properly. This may be useful e.g.
if one want to serve static files from servers with different ETag
generation algorithms.


Modified:
trunk/src/http/ngx_http_core_module.c
trunk/src/http/ngx_http_core_module.h

Modified: trunk/src/http/ngx_http_core_module.c
===================================================================
--- trunk/src/http/ngx_http_core_module.c 2012-07-09 00:13:06 UTC (rev 4749)
+++ trunk/src/http/ngx_http_core_module.c 2012-07-09 14:53:42 UTC (rev 4750)
@@ -650,6 +650,13 @@
offsetof(ngx_http_core_loc_conf_t, chunked_transfer_encoding),
NULL },

+ { ngx_string("etag"),
+ NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
+ ngx_conf_set_flag_slot,
+ NGX_HTTP_LOC_CONF_OFFSET,
+ offsetof(ngx_http_core_loc_conf_t, etag),
+ NULL },
+
{ ngx_string("error_page"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
|NGX_CONF_2MORE,
@@ -1811,7 +1818,14 @@
ngx_int_t
ngx_http_set_etag(ngx_http_request_t *r)
{
- ngx_table_elt_t *etag;
+ ngx_table_elt_t *etag;
+ ngx_http_core_loc_conf_t *clcf;
+
+ clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
+
+ if (!clcf->etag) {
+ return NGX_OK;
+ }

etag = ngx_list_push(&r->headers_out.headers);
if (etag == NULL) {
@@ -3539,6 +3553,7 @@
clcf->recursive_error_pages = NGX_CONF_UNSET;
clcf->server_tokens = NGX_CONF_UNSET;
clcf->chunked_transfer_encoding = NGX_CONF_UNSET;
+ clcf->etag = NGX_CONF_UNSET;
clcf->types_hash_max_size = NGX_CONF_UNSET_UINT;
clcf->types_hash_bucket_size = NGX_CONF_UNSET_UINT;

@@ -3800,6 +3815,7 @@
ngx_conf_merge_value(conf->server_tokens, prev->server_tokens, 1);
ngx_conf_merge_value(conf->chunked_transfer_encoding,
prev->chunked_transfer_encoding, 1);
+ ngx_conf_merge_value(conf->etag, prev->etag, 1);

ngx_conf_merge_ptr_value(conf->open_file_cache,
prev->open_file_cache, NULL);

Modified: trunk/src/http/ngx_http_core_module.h
===================================================================
--- trunk/src/http/ngx_http_core_module.h 2012-07-09 00:13:06 UTC (rev 4749)
+++ trunk/src/http/ngx_http_core_module.h 2012-07-09 14:53:42 UTC (rev 4750)
@@ -392,6 +392,7 @@
ngx_flag_t recursive_error_pages; /* recursive_error_pages */
ngx_flag_t server_tokens; /* server_tokens */
ngx_flag_t chunked_transfer_encoding; /* chunked_transfer_encoding */
+ ngx_flag_t etag; /* etag */

#if (NGX_HTTP_GZIP)
ngx_flag_t gzip_vary; /* gzip_vary */

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