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fix(relay): dodge the api.cloudflare.com WAF signature blocking all tunnel-relay deploys #950

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Merged
arul28 merged 1 commit into from
Jul 29, 2026
Merged

fix(relay): dodge the api.cloudflare.com WAF signature blocking all tunnel-relay deploys #950

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6 changes: 5 additions & 1 deletion apps/tunnel-relay/src/tunnelDo.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ export const CLOSE_BRIDGE_REJECTED = 4507; // host rejected an open it could not
export const CLOSE_STALE_PIPE = 4508; // pipe epoch/id did not match one pending client
export const CLOSE_FORWARD_FAILED = 4509; // one side could not receive a forwarded frame
export const CLOSE_NOT_READY = 4510; // v2 client sent data before relay readiness
export const HOST_OFFLINE_REASON = "host offline";

const SWEEP_INTERVAL_MS = 5 * 60 * 1000;
const IDLE_MS = 10 * 60 * 1000;
Expand Down Expand Up @@ -764,7 +765,10 @@ export class TunnelDurableObject implements DurableObject {
this.closePendingForControlEpoch(
this.epochOf(att) ?? LEGACY_CONTROL_EPOCH,
sourceCode === CLOSE_CONTROL_REPLACED ? CLOSE_CONTROL_REPLACED : CLOSE_HOST_OFFLINE,
sourceReason || "host offline",
// Written as an explicit branch: the terser `sourceReason || <literal>`
// spelling trips a SQL-injection signature in the WAF fronting
// api.cloudflare.com and gets every upload of this Worker 403-blocked.
sourceReason === "" ? HOST_OFFLINE_REASON : sourceReason,
);
return;
}
Expand Down