Accessing a Web Service from within a browser’s client-side script

Have you already accessed a Web Service through the browser?
I’m not talking about that test page shown when you open the WSDL file in Internet Explorer.
I’m talking about accessing a Web Service through client-side script.
Imagine that you have a Web Forms application whose server does a Web Service operation on another server and passes the result back to the client. It serves only as a gateway between the client and the Web Service.
Using WebService Behavior there is no need to do this triangulation because the browser can access the Web Service directly using JavaScript or VBScript on Internet Explorer 5.0 or later.
The feature is exposed through an HTML component (*.htc) but unfortunately it isn’t supported (anymore?) by Microsoft.

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