I've just done a bit more testing, since my friend emma in this Raddle thread was able to confirm in her own #Postmill instance (I've tested against #Raddle too because why not) that it's a caching reverse proxy causing images to stay longer on the server. I'm able to confirm that using a query string bypasses the proxy's cache and results in the expected 404. Hooray, and I couldn't expect any better from Raddle! :ai_yay: They always take #privacy seriously. :alice_wine:
I've used this method against #Mastodon, #Pleroma, and #Misskey. The first two still returns the image I've uploaded even though I've deleted my account AND used a query string to bypass proxy cache (yikes). Misskey forcibly rewrites the URL to strip out the query string, therefore I can't conclude for 100% sure that it's a proxy's fault. But I'm still pretty confident it is the reverse proxy's doing in the case of Misskey due to the observation I mentioned earlier where the generated file URLs that never got accessed don't get cached.
Alright I'm done with this shit, #fediverse devs, do whatever with this info with mind :seija_coffee:
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