David Smith wrote:
I think you got it right the first time. The OP wants to make sure the referrer header is present and starts with http://www.mydomain.com as opposed to http://www.anotherdomain.com. It'll help prevent other sites from linking directly to resources on the OP's site.

Basically yes.
But basing the acceptance or rejection on a HTTP request header sent by the browser is not absolutely secure, in the sense that this can easily be faked using any HTTP client agent such as wget, curl, lwp-request etc.. So you are right in saying "help prevent", but it would not be correct to say "prevent".

On the other hand, filtering requests based on the client's IP address is relatively secure, since it is much harder (and normally counter-productive) to fake that.

So, like always, it depends...

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