https://issues.apache.org/bugzilla/show_bug.cgi?id=55669
Bug ID: 55669
Summary: Mod_Cache caching 503 Errros
Product: Apache httpd-2
Version: 2.4.6
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_cache
Assignee: [email protected]
Reporter: [email protected]
I am seeing an issue where apache 2.4.6 acting as a reverse proxy is caching
503 error messages which I don't understand at all. The proxy is a simple
proxypass directive, the backend server is apache proxying to an oracle ucm
instance. When I hit the proxy while both apaches are running but not the ucm
instance, I get a 503 response (expected). Apache is appropriately serving
stale content, but when that content expires (or I remove the cached content)
then apache caches the 503 response and will serve it even after the server is
back up.
Here is the relevant part of the log
[Thu Oct 17 21:29:15.038716 2013] [proxy:debug] [pid 27382] proxy_util.c(2194):
[client 192.168.252.52:39745] AH00947: connected / to MYBACKENDSERVER
[Thu Oct 17 21:29:47.062046 2013] [proxy_http:trace3] [pid 27382]
mod_proxy_http.c(1403): [client 192.168.252.52:39745] Status from backend: 503
[Thu Oct 17 21:29:47.062103 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1086): [client 192.168.252.52:39745] Headers received from
backend:
[Thu Oct 17 21:29:47.062137 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Date: Thu, 17 Oct 2013
21:29:18 GMT
[Thu Oct 17 21:29:47.062245 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Server: Apache
[Thu Oct 17 21:29:47.062266 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Content-Type: text/html
[Thu Oct 17 21:29:47.062283 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Cache-Control: public
[Thu Oct 17 21:29:47.062299 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Expires: Thu, 17 Oct 2013
21:44:18 GMT
[Thu Oct 17 21:29:47.062319 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Vary: Accept-Encoding
[Thu Oct 17 21:29:47.062336 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Content-Length: 237
[Thu Oct 17 21:29:47.062352 2013] [proxy_http:trace4] [pid 27382]
mod_proxy_http.c(1088): [client 192.168.252.52:39745] Connection: close
[Thu Oct 17 21:29:47.062389 2013] [proxy_http:trace3] [pid 27382]
mod_proxy_http.c(1654): [client 192.168.252.52:39745] start body send
[Thu Oct 17 21:29:47.063336 2013] [deflate:debug] [pid 27382]
mod_deflate.c(764): [client 192.168.252.52:39745] AH01384: Zlib: Compressed 237
to 177 : URL /
[Thu Oct 17 21:29:47.063450 2013] [cache:debug] [pid 27382] mod_cache.c(1326):
[client 192.168.252.52:39745] AH00769: cache: Caching url: /
[Thu Oct 17 21:29:47.063515 2013] [cache:debug] [pid 27382] mod_cache.c(1332):
[client 192.168.252.52:39745] AH00770: cache: Removing CACHE_REMOVE_URL filter.
[Thu Oct 17 21:29:47.063657 2013] [http:trace3] [pid 27382]
http_filters.c(963): [client 192.168.252.52:39745] Response sent with status
503, headers:
[Thu Oct 17 21:29:47.063683 2013] [http:trace5] [pid 27382]
http_filters.c(970): [client 192.168.252.52:39745] Date: Thu, 17 Oct 2013
21:29:18 GMT
[Thu Oct 17 21:29:47.063694 2013] [http:trace5] [pid 27382]
http_filters.c(973): [client 192.168.252.52:39745] Server: Apache
[Thu Oct 17 21:29:47.063709 2013] [http:trace4] [pid 27382]
http_filters.c(806): [client 192.168.252.52:39745] Content-Type: text/html
[Thu Oct 17 21:29:47.063721 2013] [http:trace4] [pid 27382]
http_filters.c(806): [client 192.168.252.52:39745] Cache-Control:
public,max-age=900
[Thu Oct 17 21:29:47.063733 2013] [http:trace4] [pid 27382]
http_filters.c(806): [client 192.168.252.52:39745] Vary: Accept-Encoding
[Thu Oct 17 21:29:47.063744 2013] [http:trace4] [pid 27382]
http_filters.c(806): [client 192.168.252.52:39745] Content-Encoding: gzip
[Thu Oct 17 21:29:47.063755 2013] [http:trace4] [pid 27382]
http_filters.c(806): [client 192.168.252.52:39745] Connection: close
[Thu Oct 17 21:29:47.063766 2013] [http:trace4] [pid 27382]
http_filters.c(806): [client 192.168.252.52:39745] Transfer-Encoding: chunked
[Thu Oct 17 21:29:47.064575 2013] [cache_disk:debug] [pid 27382]
mod_cache_disk.c(1349): [client 192.168.252.52:39745] AH00737: commit_entity:
Headers and body for URL http://www.nature.org:80/? cached.
[Thu Oct 17 21:29:47.064644 2013] [proxy_http:trace2] [pid 27382]
mod_proxy_http.c(1793): [client 192.168.252.52:39745] end body send
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