ASP wrapper and HTTP GET requests

[Ed McNierney]

Tom -

I would say this isn't a bug in that script - you're trying to do
something the script isn't designed to do.

ASP parses both the querystring parameters and form variables into two
separate collections, each of which can be accessed individually (just
as one normally accesses individual CGI parameters).  For example, if a
parameter named "map" is passed EITHER on the querystring OR as a form
parameter, the statement:

        foo = Request ("map")

Will assign the value of that parameter to the variable "foo".  The
statement Request.Form("map") will refer specifically to the POST
varaible.

In addition, ASP makes the contents of the original URL querystring
available by referring to the entire QueryString collection as
Request.QueryString.  The equivalent unparsed string for form variables
is Request.Form, as you seem to have already discovered.

Using Request.QueryString for a GET and Request.Form for a POST should
do what you expect.  Your code below does that in the CASE statement,
but then has an extra assignment to strRequest that you obviously don't
want.

There may be some confusion because ASP also provides access to all HTTP
header information through objects in the Request.ServerVariables
collection, like cookies, user agent ID, authentication tokens, etc.,
and the QUERY_STRING is also accessible as one of those variables.

Your question about the ServerXMLHTTP call isn't terribly clear - your
code is making a GET request to the target WMS server, so I don't quite
understand your "will this work for POST" question.  You're not making a
POST request - if you want to, you need to set up the parameters
appropriately.

While I encourage new learning opportunities, I would also encourage you
to try to find someone with a little more ASP expertise.  These are very
basic questions/issues you're running into, and if you intend to use
this code in any sort of production environment it would be a good idea
to have someone on hand with a little stronger familiarity with what
you're doing.

        - Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 


-----Original Message-----
From: UMN MapServer Developers List [mailto:MAPSERVER-DEV at LISTS.UMN.EDU]
On Behalf Of Kralidis,Tom [Burlington]
Sent: Tuesday, February 22, 2005 10:13 PM
To: MAPSERVER-DEV at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-DEV] ASP wrapper and HTTP GET requests

Thanks for the info.

Bug 1253 does not have a template problem.  What's happening is that the
POST request is sent to ASP script, which passes as a GET request with
no arguments.

Can someone try this out and verify this works?  Also see comment line
below in the code:

  <%
    Server.ScriptTimeout = 360
    Select Case Request.ServerVariables("REQUEST_METHOD")
      Case "GET" strRequest = Request.QueryString
      Case "POST" strRequest = Request.Form
    End Select
    strRequest = Request.ServerVariables("QUERY_STRING")
    strURL =
"http://myserver/cgi-bin/mapserv.exe?map=C:\Inetpub\wwwroot\WMS\mymap.ma
p&" & strRequest
    Dim objHTTP
    Set objHTTP = Server.CreateObject("MSXML2.ServerXMLHTTP")
    '
    ' will this line below work for POST requests?
    '
    objHTTP.open "GET", strURL, false

    objHTTP.send ""
    Response.ContentType = objHTTP.getResponseHeader("content-type")
    Response.BinaryWrite objHTTP.responseBody
    Set objHTTP = Nothing
  %>

..Tom



> -----Original Message-----
> From: UMN MapServer Developers List
> [mailto:MAPSERVER-DEV at LISTS.UMN.EDU] On Behalf Of Jerry Pisk
> Sent: Tuesday, 22 February, 2005 20:46
> To: MAPSERVER-DEV at LISTS.UMN.EDU
> Subject: Re: [UMN_MAPSERVER-DEV] ASP wrapper and HTTP GET requests
> 
> 
> You can easily change that sample ASP page to support POST requests, 
> replace the query string read with this:
> 
> Select Case Request.ServerVariables("REQUEST_METHOD")
>   Case "GET" strRequest = Request.QueryString
>   Case "POST" strRequest = Request.Form
>   Case Else ' Handle other methods here End Select
> 
> The problem in bug 1253 is not related to this though, it's caused by 
> a missing template in a mapfile as far as I can tell.
> 
> Jerry Pisk
> 
> On Tue, 22 Feb 2005 18:27:57 -0500, Kralidis,Tom [Burlington] 
> <Tom.Kralidis at ec.gc.ca> wrote:
> > Hi,
> >
> > There seems to be a problem with the ASP wrapper example
> provided for
> > hiding the mapfile from:
> >
> > 
> http://mapserver.gis.umn.edu/doc44/wms-server-howto.html#onlineresourc
> > eu
> > rl
> >
> > I've filed a bug against this:
> >
> > http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1253
> >
> > The wrapper script doesn't support POST requests.
> >
> > Are there any ASP gurus out there who can tweak the example
> so that it
> > can recognize when a POST request comes in and pass it as such?
> >
> > Thanks
> >
> > ..Tom
> >
>