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(fix): handle Cloudflare 521 and transient 5xx errors gracefully (#13500)

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Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: a8347e95c5
Co-authored-by: rodrigouroz <384037+rodrigouroz@users.noreply.github.com>
Co-authored-by: Takhoffman <781889+Takhoffman@users.noreply.github.com>
Reviewed-by: @Takhoffman
This commit is contained in:
Rodrigo Uroz
2026-02-12 00:42:33 -03:00
committed by GitHub
parent c28cbac512
commit b912d3992d
10 changed files with 310 additions and 2 deletions
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24
src/agents/model-fallback.test.ts
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@@ -59,6 +59,30 @@ describe("runWithModelFallback", () => {
expect(run.mock.calls[1]?.[1]).toBe("claude-haiku-3-5");
});
it("falls back on transient HTTP 5xx errors", async () => {
const cfg = makeCfg();
const run = vi
.fn()
.mockRejectedValueOnce(
new Error(
"521 <!DOCTYPE html><html><head><title>Web server is down</title></head><body>Cloudflare</body></html>",
),
)
.mockResolvedValueOnce("ok");
const result = await runWithModelFallback({
cfg,
provider: "openai",
model: "gpt-4.1-mini",
run,
});
expect(result.result).toBe("ok");
expect(run).toHaveBeenCalledTimes(2);
expect(run.mock.calls[1]?.[0]).toBe("anthropic");
expect(run.mock.calls[1]?.[1]).toBe("claude-haiku-3-5");
});
it("falls back on 402 payment required", async () => {
const cfg = makeCfg();
const run = vi