How to prevent form element from sending some fields we don’t want?

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Remove the name attribute on the fields you do not want submitted to the server.

<form action="abc/def.aspx" method="get">
    <input type="text" />
    <input type="text" />
    <input type="text" />
    <input type="text" />
    <input type="text" />
    <input type="hidden" name="final" />
    <input type="submit" value="Send" />
</form>

This is the simplest way to achieve what you want, and it works on all major browsers.

W3 spec talks about only submitting form values when name is present: http://www.w3.org/TR/html401/interact/forms.html#h-17.2

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