[users@httpd] RewriteMap script puts newline character in URL

[Mark Thias <Ma...@bnpi.com>]

I'm trying to use a RewriteMap and a RewriteRule for load balancing. I use a
python script in the RewriteMap to modify the URL but I get a newline
character in the URL which causes a browser error.

HTTP ERROR: 404 /ctms/%0D Not Found 

My environment is as follows: 
 1. Apache 2.0.48
 2. Win2K 5.00.2195 Service Pack 3
 3. Python23

My httpd.conf looks as follows:

RewriteEngine on
RewriteLogLevel 20
RewriteLog rewrite.log
RewriteMap servers "prg:C:/Tools/Python23/python.exe c:/proxy.py"
RewriteRule ^/ctms/(.*) ${servers:$1}  [P,L]

My python script:

#!c:\Tools\Python23\python.exe

count=0

import sys
import string
import os

if __name__ == "__main__":
    servers = ['http://server1:8080/ctms/','http://server2:8080/ctms/']
    while 1:
        data = sys.stdin.readline()
        if not data:
            break
        count = (count+1) % 2
        print servers[count]  ( remaps correctly but puts newline character
in URL )
#        sys.stdout.write("%s" % servers[count])  (tried this but causes
hang)
#        sys.stdout.write("%s\n" % servers[count])  (tried this, same as
print)
        sys.stdout.flush()  ( if I don't have this, does not remap )


Rewrite.log:

(2) init rewrite engine with requested uri /ctms/
(3) applying pattern '^/ctms/(.*)' to uri '/ctms/'
(2) init rewrite engine with requested uri /ctms/
(3) applying pattern '^/ctms/(.*)' to uri '/ctms/'
(5) map lookup OK: map=servers key= -> val=http://server1:8080/ctms/
198.213.32.14 - - [17/Dec/2003:15:12:20 --0600]
[server1/sid#23c590][rid#47e9c0/initial] (2) rewrite /ctms/ ->
http://server1:8080/ctms/ 198.213.32.14 - - [17/Dec/2003:15:12:20 --0600]
[server1/sid#23c590][rid#47e9c0/initial] (2) forcing proxy-throughput with
http://server1:8080/ctms/ 198.213.32.14 - - [17/Dec/2003:15:12:20 --0600]
[server1/sid#23c590][rid#47e9c0/initial] (1) go-ahead with proxy request
proxy:http://server1:8080/ctms/<newline character here> [OK]

Thank you for any leads you may have to this problem.

Mark Thias
  


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Re: [users@httpd] RewriteMap script puts newline character in URL

[André Malo <nd...@perlig.de>]

* Mark Thias <Ma...@bnpi.com> wrote:

> I'm trying to use a RewriteMap and a RewriteRule for load balancing. I use a
> python script in the RewriteMap to modify the URL but I get a newline
> character in the URL which causes a browser error.
> 
> HTTP ERROR: 404 /ctms/%0D Not Found 

Well, this is half a windows newline. (CR)
mod_rewrite should recognize it. Can you please file a bugreport regarding
the issue? (That way it doesn't get forgotten) A workaround for now is
described below.

> #!c:\Tools\Python23\python.exe

try adding the -u commandline option, like

#!c:\Tools\Python23\python.exe -u

If it doesn't work, use the -u option in your RewriteMap definition.

>         sys.stdout.flush()  ( if I don't have this, does not remap )

If you're using -u, this line is probably no longer necessary. In particular
it switches the channels (stdin/out/err) to unbuffered and binary handling.

(all untested, as usual ;-)

nd

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