Change image URL

I’m using the Casper theme for my Ghost site.
I wrote an image proxy script that watermarks any photo you pass through it.

What I’m wondering is how to pass all post/content images through it.

The current blog URL is but I would like the image base URL to change to
Is this possible on a theme level?

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@Luen I’m interested in finding out the answer to this as well.

Would you mind sharing your image proxy script?

The script is now available at GitHub - Luen/ws-watermark-image: Watermark Wanderstories images

You can see it in action at

Hopefully, there are not any vulnerabilities in the script #notacoder
Please let me know if there is.

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I ended up just using a CloudFlare worker to rewrite the src and srcset attributes. Done :white_check_mark: