En Sun, 01 Mar 2009 12:23:20 -0200, Muddy Coder <cosmo_gene...@yahoo.com>
escribió:
Nowadays some websites let users to fill in some so-called
verification code, and the tricky thing is that the CODE is delivered
from server with an image. For example:
<img src="/jobsearch/captcha.jpg" name="CAPTCHA_IMAGE" border="1" /
<a href="#" onClick="changeSource();">Refresh Image</a>
When click Refresh Image, the CODE on the image changes. I wonder:
does the server really send a new image over to browser, or just send
a hidden code over? Is it possible to parse out such hidden code?
The server may asociate the expected value (CODE) to some session ID.
Delivering a new image means a new value associated. No other changes are
needed in the client side.
--
Gabriel Genellina
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