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ISAPI_Rewrite 2.x (Forum Locked Forum Locked)
 Helicon Tech : ISAPI_Rewrite 2.x
Subject Topic: Rewrite
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Joined: 27 July 2010
Posts: 6
Posted: 11 August 2011 at 6:06pm


Our company is running a legacy www retrieve application from 1995 that is failing after the migration. I seem to have tracked the issue down to the HEADER values being passed to the server.

When the application calls the web page normally, IIS responds with a basic 400 error. httperr.log is giving the following.
2011-08-11 20:01:33 741 80 HTTP/0.0 GET /page.htm 400 - BadRequest -
2011-08-11 20:02:11 2795 80 HTTP/0.0 GET /page.htm 400 - BadRequest -
When i call it directly through Fiddler using a crafted header, i get the same error.
IIS6 Windows 2003 Standard
GET /page.htm HTTP/V1.0
User-Agent: www_Retriever
Accept: */*
Host: serverA

HTTP/1.1 400 Bad Request
Content-Type: text/html
Date: Thu, 11 Aug 2011 19:59:22 GMT
Connection: close
Content-Length: 20
However, When I call it directly through Fiddler using a proper crafted header for HTTP/1.0, the page is retrieved and IIS responds properly. Even though all i changed was the HEADER to HTTP/1.0 and not HTTP/V1.0.

So, is it possible to use the rewriteheader option to rewrite the incoming header before IIS processes the request?


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Joined: 30 January 2007
Location: Ukraine
Posts: 10519
Posted: 12 August 2011 at 3:07am

The problem is that GET is not actually a header, headers start after it, so it's rather problematic to rewrite it.

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