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Meaning of __EXCB__ in URLs generated by CallbackUrlEx


Tim
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Hi,

 

In my project i have been using UniSession.CallbackUrl to obtain a target URL for file uploads. After deploying the project as an ISAPI DLL, i realised that this is a little problematic, because URLs returned by UniSession.CallbackUrl don't include the DLL name. So i switched to UniSession.CallbackUrlEx, which has an option to return an absolute URL. However, the form's OnAjaxEvent, which i am using to process the uploaded files, doesn't get triggered if i use a URL returned by UniSession.CallbackUrlEx.

 

So i compared the URLs and noticed that URLs returned by UniSession.CallbackUrlEx include the following additional parameter:

 

__EXCB__=1

 

When i remove this parameter, the form's OnAjaxEvent *does* get triggered when a file is uploaded. So this way seems to work  -- i'm just wondering if this is a safe approach? What is the purpose of the __EXCB__ parameter?

 

Many thanks,

Tim

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