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fix: placekitten.com is returning HTTP 521 (origin dead)#1606

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kiluazen:fix/dead-placeholder-urls-2026-04-22-batch6
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fix: placekitten.com is returning HTTP 521 (origin dead)#1606
kiluazen wants to merge 1 commit intoinfinitered:masterfrom
kiluazen:fix/dead-placeholder-urls-2026-04-22-batch6

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lib/reactotron-core-client/README.md references placekitten.com URLs. The origin has been returning HTTP 521 (Cloudflare origin unreachable) for months.


Why this is needed

placekitten.com's origin is returning HTTP 521 (Cloudflare origin unreachable) and has been unreliable throughout 2025-2026. The service is effectively dead for programmatic use.

Verify in any shell:

curl -sI --max-time 3 https://placekitten.com/300/200 | head -1
# HTTP/2 521

What this PR changes

Fixes the 2 uri examples in the reactotron-core-client README so the image-log examples actually render a cat image for developers trying reactotron for the first time.

Replacement details

cataas.com ('Cat as a Service') is alive, returns a 200 cat image at any size via ?width=<W>&height=<H>, and preserves the kitten-ness of the original placekitten URL — which seems to be the point of the example. Also upgrades http:https:.

Background

I'm tracking dead image-placeholder endpoints (source.unsplash.com/*, via.placeholder.com/*, placekitten.com/*) across public repos as part of tteg, a tiny CLI/HTTP API I built so projects can drop in real Unsplash photos without registering an Unsplash app or managing API keys. tteg is not introduced as a dependency by this PR — the diff uses the dependency-free canonical replacement domain. If you want topic-matched real photos as a follow-up, the no-key HTTP API is at https://tteg-api-53227342417.asia-south1.run.app/search?q=<query>&n=1 (CORS-on, no auth).

One extra artifact you may find handy: a public scanner at https://tteg.kushalsm.com/scan?url= that highlights dead-placeholder patterns in any landing page — useful for verifying the fix lands and for finding other places dead URLs slipped in. Source: https://github.com/kiluazen/tteg-landing/blob/main/scan.html.

Research note covering the broader broken-placeholder landscape: https://github.com/kiluazen/tteg/blob/research-note-autark/RESEARCH.md.

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