Posted: 19 July 2010 at 11:00am | IP Logged

Hello all,

I have installed the full verison of isapi_rewrite and have setup a proxy directive so that all traffic to my workstation in the folder 'ngis' (on any port) goes to another server. This is for testing purposes to check suitability before rolling out isapi_redirect to our prod servers.

I have a rule as follows:

This works perfectly when I enter a URL as follows:

http://10.1.111.20:8080/ngis/QueryEngine.ptl/DocTree(%60/2007/MELBOURNE/R01%60,%601%60).xml

However, if I enter a UIRL with a querystring, such as:

http://10.1.111.20:8080/ngis/QueryEngine.ptl/DocTree(%60/2007/MELBOURNE/R01%60,%601%60).xml?VIEW=RAW

I get a "The page cannot be found" error.

Looking in the logs the steps appear to be the same. Here is the log entry for the two requests above:

10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) init rewrite engine with requested uri /ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) Htaccess process request C:\Program Files\Helicon\ISAPI_Rewrite3\httpd.conf
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) Htaccess process request c:\inetpub\wwwroot\.htaccess
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (3) applying pattern '^ngis/(.+)$' to uri 'ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml'
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) forcing proxy-throughput with http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) go-ahead with proxy request http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml [OK]
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) Rewrite URL to >> http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xmlx.rwhlp?p=2
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) rewrite 'ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml' -> 'http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xmlx.rwhlp?p=2'
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:52:30 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) internal redirect with http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xmlx.rwhlp?p=2 [INTERNAL REDIRECT]

10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) init rewrite engine with requested uri /ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml?VIEW=RAW
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) Htaccess process request C:\Program Files\Helicon\ISAPI_Rewrite3\httpd.conf
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) Htaccess process request c:\inetpub\wwwroot\.htaccess
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (3) applying pattern '^ngis/(.+)$' to uri 'ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml'
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) forcing proxy-throughput with http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml?VIEW=RAW
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) go-ahead with proxy request http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml?VIEW=RAW [OK]
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (1) Rewrite URL to >> http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml?VIEW=RAWx.rwhlp?p=2
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) rewrite 'ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml' -> 'http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml?VIEW=RAWx.rwhlp?p=2'
10.1.111.20 10.1.111.20  Mon, 19-Jul-2010  16:53:52 GMT [10.1.111.20/sid#1][rid#11050940/initial] (2) internal redirect with http://10.2.25.157:8080/ngis/QueryEngine.ptl/DocTree(`/2007/MELBOURNE/R01`,`1`).xml?VIEW=RAWx.rwhlp?p=2 [INTERNAL REDIRECT]

As you can see, as far as isapi_rewrite is concerned it has done its bit. However, I can confirm that the target server does not receive the request (as we are debugging it at the time to try and diagnose the issue!)

The issue appears to be cauised by the existence of a '?' and some querystring parameters.

I have tried both RewriteRule and RewriteProxy and get the same issue.

Help please!

Posted: 20 July 2010 at 3:26am | IP Logged

Update - I have tried this on two more PCs.

Another 32-bit and the same issue occurs.

A 64-bit machine and it works.

Looks like a bug to me!!!!

Posted: 23 July 2010 at 7:18am | IP Logged

Windows XP Pro - SP3

ISAPI Rewrite - 3.1.0.73

Posted: 26 July 2010 at 4:07am | IP Logged

Hmmm ... as we were going to use ISAPI_REWRITE as a temporay solution whilst developing some new code, I think we will use Apache instead.

It provides the proxying that I want for free (instead of me having to buy 8 licenses of ISAPI_Rewrite) and it is working right now.

Thanks anyway.

Posted: 29 July 2010 at 2:07am | IP Logged

XP limits you to 10 connections - for a development workstation this is fine. In over 10 years of ASP development I have NEVER reached this limit on a local PC.

ISAPI Rewrite on XP with a querystring specified does not work at all - sorry but the conenction limit for XP is not the issue in this case!

Posted: 29 July 2010 at 10:21am | IP Logged

Andrew,

Thanks a lot for greater details on the problem. Yesterday I migrated my application to IIS 7.5. It works fine now. The problem is that I still have some problems with several redirected links in my application. Sometimes when I press the links in question on my dev machine the application throws error 404.11 specific to IIS 7.5 (Request contains double escape sequence) What would you recommend to address the problem? The fact is everything works as it supposed to on production server powered by WS2003 and IIS6. IIS7.5 seems to be interpreted some rules in wrong way, as attack on the site. I am enclosing one rule from my config file. Any ideas about the problem?

Posted: 29 July 2010 at 10:58am | IP Logged

I've addressed the problem by adding the following lines to web.config file of my application but not quite sure it's a straight forward approach:

<system.webServer> 
    <security> 
        <requestFiltering allowDoubleEscaping="true"/> 
    </security> 
</system.webServer>