Why are webp images created by PhastPress not cached?
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Hello. I am using PhastPress with WP Super Cache. Everything is enabled on PhastPress other than GZIP compression (which is enabled server side in htaccess). For WP Super Cache, I am using simple delivery method with 304 browser caching and “Cache HTTP headers with page content”. I am not behind any CDN, although I use Jetpack related posts, which I think uses a CDN for its resources.
My issue is that while other resources are cached, webp images served by PhastPress are not. This is not the issue with other image types or webp images served by Jetpack related posts. What could be causing this?
I’ve tested this several types in a private windows of Firefox and refreshing the same page — both the site log and the image in the post, transformed to webp by PhastPress, are never cached.
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