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Jul 4, 2008, 5:16 AM
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[Bug 45341] New: Apache reverse-proxy returns 304 on non-conditional GET request
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https://issues.apache.org/bugzilla/show_bug.cgi?id=45341
Summary: Apache reverse-proxy returns 304 on non-conditional GET
request
Product: Apache httpd-2
Version: 2.2.3
Platform: PC
OS/Version: Linux
Status: NEW
Keywords: RFC
Severity: normal
Priority: P2
Component: mod_cache
AssignedTo: bugs[at]httpd.apache.org
ReportedBy: JKirschner[at]firma.seznam.cz
I'm running apache 2.2.3 as a caching reverse proxy (proxy.aa) to another
server (server.aa). The problem appears when sending requests without
If-Modified-Since present - the response shouldn't be 304.
First, I send a request:
telnet proxy.aa 8312
GET http://server.aa/request HTTP/1.1
Host: server.aa
the proxy forwards to the server:
GET /request HTTP/1.1
Host: server.aa
Max-Forwards: 10
X-Forwarded-For: a.a.a.a
X-Forwarded-Host: server.aa
X-Forwarded-Server: proxy.aa
Connection: Keep-Alive
and receives (still everything OK):
HTTP/1.1 200 OK
Date: Fri, 04 Jul 2008 08:50:15 GMT
Expires: Fri, 04 Jul 2008 08:52:25 GMT
Last-Modified: Fri, 04 Jul 2008 08:43:47 GMT
Cache-Control: max-age=130
Server: Server/2.3.1-1 (Unix, VB)
Allow: GET,HEAD
Accept-Ranges: none
Content-Type: image/jpeg; charset=utf-8
Content-Length: 3102
Connection: close
..... THE CONTENT ....
So the situation is: the proxy cached this request with max age 130s (2:10) and
for every following 'request' doesn't forward and uses the cached result for 2
minutes. but than I send another request:
telnet proxy.aa 8312
GET http://server.aa/creative?bannerId=618167&seqNo=4&set=sec HTTP/1.1
Host: server.aa
and proxy.aa forwards to server.aa:
GET /request HTTP/1.1
Host: server.aa
If-Modified-Since: Fri, 04 Jul 2008 08:43:47 GMT
Max-Forwards: 10
X-Forwarded-For: 10.0.2.236
X-Forwarded-Host: server.aa
X-Forwarded-Server: proxy.aa
Connection: Keep-Alive
the server returns 304, because the content is still the same:
HTTP/1.1 304 Not modified
Date: Fri, 04 Jul 2008 08:52:25 GMT
Server: Server/2.3.1-1 (Unix, VB)
Allow: GET,HEAD
Accept-Ranges: none
Connection: close
and I receive:
HTTP/1.1 304 Not modified
Date: Fri, 04 Jul 2008 08:52:37 GMT
Server: Server/2.3.1-1 (Unix, VB)
Which is, I think, an error - from the client point of view. Client sends a
non-conditional request and receives 304 - not modified. How is this possible?
The only idea, I've got is, that it is caused by missing Expires: or
Cache-Control: max-age= in response from server.aa. But still, a 304 response
on request without If-Modified-Since command.
The proxy (incomplete) configuration:
Listen 8312
LoadModule authz_default_module /usr/lib/apache2/modules/mod_authz_default.so
LoadModule authz_host_module /usr/lib/apache2/modules/mod_authz_host.so
LoadModule cache_module /usr/lib/apache2/modules/mod_cache.so
LoadModule disk_cache_module /usr/lib/apache2/modules/mod_disk_cache.so
LoadModule mime_module /usr/lib/apache2/modules/mod_mime.so
LoadModule mime_magic_module /usr/lib/apache2/modules/mod_mime_magic.so
LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
LoadModule proxy_connect_module /usr/lib/apache2/modules/mod_proxy_connect.so
LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so
LoadModule setenvif_module /usr/lib/apache2/modules/mod_setenvif.so
LoadModule forwardedfor_module /usr/lib/apache2/modules/mod_forwardedfor.so
UseCanonicalName Off
CacheRoot /home/xxxxxxxx
CacheEnable disk /creative
CacheDirLevels 5
CacheDirLength 3
CacheDefaultExpire 3600
ProxyTimeout 1
NameVirtualHost *:8312
<VirtualHost *:8312>
ProxyPass / http://server.aa:80/
</VirtualHost>
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