D2007 web service proxy not 'honoring' CacheDuration setting
on web service

I have a web service (written in VS2005/C#) that the Delphi created proxy 
class is not working correctly with the CacheDuration setting.

Example:

[WebMethod(Description = "Number of times this service has been
accessed",
CacheDuration = 60, MessageName = "ServiceUsage")]
public int ServiceUsage()
{
// If the XML Web service has not been accessed, initialize it to 1.
if (Application["MyServiceUsage"] == null)
{
Application["MyServiceUsage"] = 1;
}
else
{
// Increment the usage count.
Application["MyServiceUsage"] =
((int)Application["MyServiceUsage"]) + 1;
}
// Return the usage count.
return Application["MyServiceUsage"];
}

The Delphi created client (D6 and D2007) always returns the incrementing 
number where IE and VS2005 return the cached value.

Is this a bug?  Is there a workaround?

Thanks for any info,
krf 

Hello Kevin,

Do you have a way to peek at the HTTP request/response going back and forth
between client and server/service? The issue is to find out how
'CacheDuration' is implemented. There's nothing at the SOAP packet level
that I know of that handles caching... so my guess is that this is being
handled (maybe?) via an HTTP header. The 'Cache-Control' header would be the
perfect fit.

If the above assumption is correct the Delphi SOAP runtime (see
SOAPHTTPTrans.pas) sets the INTERNET_FLAG_NO_CACHE_WRITE flag. You probably
would not want that as it requests that the response to be added to the
cache.

If you have a log of the HTTP transaction, specially between a client where
it works and one between the Delphi client and the service (where it does
not work), that would be very helpful!

Cheers,

Bruneau.

Thanks for the reply.

Do you have a suggestion on a http monitoring utility?

krf

"Jean-Marie Babet" <bbabet@borland.com> wrote in message 
news:47c458bf$2@newsgroups.borland.com...
> Hello Kevin,
>
> Do you have a way to peek at the HTTP request/response going back and 
> forth
> between client and server/service? The issue is to find out how
> 'CacheDuration' is implemented. There's nothing at the SOAP packet level
> that I know of that handles caching... so my guess is that this is being
> handled (maybe?) via an HTTP header. The 'Cache-Control' header would be 
> the
> perfect fit.
>
> If the above assumption is correct the Delphi SOAP runtime (see
> SOAPHTTPTrans.pas) sets the INTERNET_FLAG_NO_CACHE_WRITE flag. You 
> probably
> would not want that as it requests that the response to be added to the
> cache.
>
> If you have a log of the HTTP transaction, specially between a client 
> where
> it works and one between the Delphi client and the service (where it does
> not work), that would be very helpful!
>
> Cheers,
>
> Bruneau.
>
> 

Hello,

I've used ProxyTrace for this kind of monitoring before:

  http://www.pocketsoap.com/tcptrace/pt.aspx

Cheers,

Bruneau.

"Jean-Marie Babet" <bbabet@borland.com> wrote in message 
news:47e030b5$1@newsgroups.borland.com...
> Hello,
>
> I've used ProxyTrace for this kind of monitoring before:
>
>  http://www.pocketsoap.com/tcptrace/pt.aspx

Thanks, but it doesn't do anything.  Starts up fine, status bar states 
'Proxy started....', then that's pretty much it.

How did you use it before?

krf