HTTP response code 403 (forbidden)

Hi, my name is Sebastiano and I'm a student.
I'm developping a Server-Client application for Web in 100% Java.
My application comunicates with a browser (Explorer) through a socket to satisfy http request.
So my application is between the browser and the web (like a proxy).
My application create an HttpUrlConnection with the URL contained in the http request getting from the browser, receive the response (the content of the url requested) from this URL and after doing some task with it, send it to browser as response.
However some site (in particular www.google.com when my application send to it a query of research) gives to my application http response code 403 (forbidden) raising an "java.io.IOException: Server returned http response code: 403 for URL ...".
There is someone who can help me ... may questions are:
Why my application get this respone code?
There is something to set in HttpUrlConnection to avoid this response?
How can I avoid this response?
Thank you very much for yuor reply,
Sebastiano.

Read this page:
http://www.google.com/terms_of_service.html
Especially the section headed "No Automated Querying".

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