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Modern browsers suppress the referrer. Relying on it for functionality is not a good idea.

• Meph504 5y ago
  Fair point, you can accomplish the same by comparing the ip adress that the image request came from against your servers.
  • ichicoro 5y ago
    Wouldn't that just mean comparing the user's public address? It is the browser that is trying to download the image from your servers.
    • Meph504 5y ago
      The shortest route yes, but I'd rather whitelist check, because depending on your infra, there might be a lot more things that make request for the content. But the concept is the same, server side check the ip of the request, and take action based on that check.