Using reCAPTCHA with ASP.NET

Does the reCAPTCHA usercontrol post a request to http://www.google.com/recaptcha/api/verify to verify the entered text matches the captcha, or is this 开发者_如何学Cdone in the dll?

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Turns out it does make requests to Google.

The first is a request from the client for a captcha image

The second is a request from the server to validate the entered text against the image

http://code.google.com/apis/recaptcha/docs/display.html