>Number: 4427
>Category: mod_proxy
>Synopsis: Apache reverse proxy and CGI's
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: apache
>State: open
>Class: sw-bug
>Submitter-Id: apache
>Arrival-Date: Mon May 17 03:50:01 PDT 1999
>Last-Modified:
>Originator: [EMAIL PROTECTED]
>Organization:
apache
>Release: 1.3.6
>Environment:
SunOS montblanc 5.7 Generic sun4u sparc SUNW,Ultra-60
gcc version 2.8.1
>Description:
I have a Apache server (called A) configured as a reverse proxy, and it
passes
some requests to a slave Apache server (called B) on another machine. My problem
is that I have a CGI program on B and when you run against B there is no
problem, but when you run the same CGI against A (the browser makes the request
to A, A makes the request to B, B processes the requests, B returns the answer
to A, and A returns the answer to the browser), it seems A is making some
caching, because only when the CGI has finished you get the answer. I don't want
this because the CGI program is using server push techniques to give the
answers. I have deactivated the proxy caching, so, where is the problem? Is
there a bug on Apache? I think the problem could be on the rewrite rule, when it
passes what it made to the proxy module, but I'm not an Apache hacker.
>How-To-Repeat:
You must configure server A with two lines like these (with mod_rewrite and
mod_proxy enabled, and proxy configuration enabled, too):
RewriteRule ^/(jmfernandez.*)$ http://A.B.C/$1 [P,L]
ProxyPassReverse /jmfernandez/ http://A.B.C/jmfernandez/
and the server B with this configuration line:
ScriptAliasMatch ^/(.*)/cgi-bin(.*)$ /usr/local/apache/htdocs/$1/cgi-bin$2
On server B, at /usr/local/apache/htdocs/jmfernandez/cgi-bin, put this simple
Perl program, and run calling through A or B, and you will be able to sense the
differences:
#!/usr/local/bin/perl -w
use strict;
&main;
sub main {
my($dolar)=5;
$|=1;
print<<'EOF';
Content-type: multipart/x-mixed-replace;boundary=appboundary
--appboundary
EOF
while($dolar--) {
print<<'EOF';
Content-type: text/html
<HTML>
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<BODY><CENTER><H1>H O L A</H1></CENTER>
</BODY></HTML>
--appboundary
EOF
sleep 3;
print<<'EOF';
Content-type: text/html
<HTML><BODY>
<CENTER><H1>A D I O S</H1></CENTER>
</BODY></HTML>
--appboundary
EOF
sleep 3;
}
}
>Fix:
>Audit-Trail:
>Unformatted:
[In order for any reply to be added to the PR database, ]
[you need to include <[EMAIL PROTECTED]> in the Cc line ]
[and leave the subject line UNCHANGED. This is not done]
[automatically because of the potential for mail loops. ]
[If you do not include this Cc, your reply may be ig- ]
[nored unless you are responding to an explicit request ]
[from a developer. ]
[Reply only with text; DO NOT SEND ATTACHMENTS! ]
