Custom Query (2297 matches)

When a file isn't cached and two concurrent downloads are made for it, we get this behavior:

1) Nginx writes twice, to two temporary files. This duplicates disk writes for the same data. 2) Ignore_client_abort is force-enabled when caching, so nginx must download both files to completion even if the clients abort. This can waste bandwidth, diskspace, and disk writes.

This patch makes nginx write to a temporary file only for the first request; subsequent concurrent requests are proxied without writing.

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index c92de34..be61aa5 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -289,6 +289,10 @@ ngx_http_file_cache_open(ngx_http_request_t *r)
             return c->error;
         }
 
+        if (!c->exists && c->node->updating) {
+            return NGX_HTTP_CACHE_SCARCE;
+        }
+
         c->temp_file = 1;
         test = c->exists ? 1 : 0;
         rv = NGX_DECLINED;
@@ -381,10 +385,6 @@ ngx_http_file_cache_lock(ngx_http_request_t *r, ngx_http_cache_t *c)
     ngx_msec_t                 now, timer;
     ngx_http_file_cache_t     *cache;
 
-    if (!c->lock) {
-        return NGX_DECLINED;
-    }
-
     cache = c->file_cache;
 
     ngx_shmtx_lock(&cache->shpool->mutex);

When using nginx to proxy_pass requests to another webserver I'd like to intercept error pages and show own error.

I set proxy_intercept_errors=on, set the error_page, but when I set "proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;" the 500 error from backend is displayed instead of custom error page.

Dear Sir/Madam,

At the moment nginx is hiding some headers for ssi-processed documents:

Note that when SSI is enabled the Last-Modified and Content-Length headers are not sent.

Is it possible to add an ETag header to this list?

Thank you.

With best regards, Daniel Podolsky