Not much to go on, but you might want to check that your URL is not growing, like... 
http://foo.cgi?name=foo&pwd=bar
http://foo.cgi?name=foo&pwd=bar?name=foo&pwd=bar
http://foo.cgi?name=foo&pwd=bar?name=foo&pwd=bar?name=foo&pwd=bar

[download]
That can happen if your FORM action is not set up properly.

In reply to Re: Buffered STDIN by Sifmole
in thread Buffered STDIN by Sojourner

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