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I'm using captcha 7.x-1.0-beta2+16-dev and Drupal 7.22.
I have seen some log entries lately and in the past of spam bots requesting the same captcha image multiple times in order to get the easiest to answer version of the captcha. For example if I call:
http://mysite.com/image_captcha?sid=5&ts=1365221990 multiple times, I will get an image with the same solution but generated multiple times.
It might be better to just return a "304 Not Modified" header in this case to tell client browsers to use what is already in there cache, or to force a new solution to be generated?
Is there some other way may be to prevent spammers from cherry picking image captchas?
Thank you very much!