IIS6 Windows 2003 CGI error

[Ken Lord]

Hi David,
 I would suggest trying the mapserver package from
maptools.org/dl<http://maptools.org/dl>
 People have had dll problems with the package for windows downloaded from 
other sources in the past couple months, giving the 'http headers' error.
 Place mapserv.exe and all the associated dll's in a folder on the server. 
Setup the folder as a virtual directory within your website with 'scripts 
and executables' permitted. Be sure to give write access to the location 
where the temporary images will be stored. In IIS, add a new web extension 
that allows access to the exe and all the dll's.
 Setting up mapserver this way allows you to very quickly switch between 
different versions by pointing your website's scripts virtual directory at 
the version you want to use, assuming the versions have compatible syntax.
 ---
 In the opposite way I have had the error you're seeing. Browse always 
works, but map mode occasionally fails with the 'http headers' error. 
 In my case when I query a map, my website generates query results that 
include a snapshot of the area queried using mode=map. The failures are 
fairly consistant based on where on the map you query, I've found nothing 
wrong with the underlying datasets, no invalid geometries. I've used 
shapefiles and PostGIS.
 These errors started with version 4 of mapserver, never having happened 
with 3.6. I'm also using Windows Server 2003, but saw the same errors using 
Windows Server 2000. Unfortuneately map=mode seems to work flawlessly for 
everyone else, so the problem remains :) ... I'll be forcing my snapshots to 
use version 3.6.
 Cheers,
Ken Lord
Vancouver BC
 

 On 6/4/05, David Shorthouse <dps1 at ualberta.ca> wrote: 
> 
> Hello folks,
> 
> This is my first posting to the list so I hope I am adhering to your
> conventions. After messing around with other applications similar to
> MapServer, I finally settled on this one because it is so incredibly
> powerful and simple. I just spent the past week working it up for a web
> application. Here are my specs:
> 
> Windows 2003 Server running IIS6 (all patches installed)
> 933MHz, 512MB RAM
> MapServer 4.4.1 installed through ms441pg.zip package
> System DSN ODBC connection to Access 2003 db via OGR connectiontype and
> associated ovf connection file
> 
> Now on to the issue....
> 
> Map mode works flawlessly on my system and my filteritems for the OGR
> connection work just dandy. However, when I use browse mode and my
> associated template, I occasionally get the following message on the 
> client
> side:
> 
> "CGI Error
> 
> The specified CGI application misbehaved by not returning a complete set 
> of
> HTTP headers."
> 
> This doesn't often happen, but strangely, it will happen all the time if I
> add additional fields to the Access db table containing the data being
> filtered using the OGR connection. When I delete these fields in the 
> Access
> table in question, these HTTP header errors drop off and become less
> frequent.
> 
> I came across this MS KB article:
> http://support.microsoft.com/default.aspx?scid=kb;EN-US;884764 that 
> appears
> to describe the issue but my machine certainly isn't a fast, 
> multi-processor
> unit.
> 
> So, it appears the problem is IIS6 but why does browse mode choke and map
> mode work 100% of the time? Is there something in the IIS Manager (e.g.
> Application Pool config, permissions, etc.) that causes this issue?
> Unfortunately, I can't use another OS or server app (unless I investigate 
> a
> gawd-awful Apache to IIS6 port-map) because of the network infrastructure 
> I
> currently manage.
> 
> Thanks for any pointers,
> 
> David Shorthouse
>
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