Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.
    
It probably checks the referer header to make an educated guess, and is also easy to fool. Other than that there is no way to differentiate a linked image from a direct request, the requests are the same. –  Jason C yesterday
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.