Process form only if sent by server

I have some pages in my web app which deal with the sent data from a form. I want to avoid the following situation:

An user creates (in the client side) a form with the same fields that my original form and sends it to the url which process the forms. Then, my process page receives the form sent by the user and processes it.

Is there any way to do that only forms sent via my web application get processed?

Thank you

Source: forms

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