diff --git a/package.json b/package.json
index 651895e9f..0d0dd831b 100644
--- a/package.json
+++ b/package.json
@@ -108,6 +108,7 @@
     "generate:cloudflare-canonical-mdi-seed": "npm run generate:cloudflare-mdi-runtime-bundle && php scripts/build-cloudflare-canonical-mdi-seed.php",
     "smoke": "tsx scripts/run-smoke.ts",
     "test:redaction": "tsx tests/redaction.test.ts",
+    "test:browser-preview-routing": "tsx --test tests/browser-preview-routing.test.ts",
     "test:cloudflare-runtime": "node --test tests/cloudflare-d1-provisioner.test.mjs && tsx tests/cloudflare-site-context.test.ts && tsx tests/cloudflare-coordinator-site-partitioning.test.ts && tsx tests/cloudflare-d1-operation-repository.test.ts && tsx tests/cloudflare-provisioning-api.test.ts && tsx tests/cloudflare-runtime.test.ts && node ./node_modules/typescript/bin/tsc -p packages/runtime-cloudflare --noEmit",
     "test:cloudflare-administrator-claim": "tsx tests/cloudflare-provisioning-api.test.ts",
     "test:cloudflare-wordpress-auth": "tsx tests/cloudflare-wordpress-auth.test.ts",
diff --git a/packages/runtime-core/src/redaction.ts b/packages/runtime-core/src/redaction.ts
index 70e00e212..4902cf783 100644
--- a/packages/runtime-core/src/redaction.ts
+++ b/packages/runtime-core/src/redaction.ts
@@ -96,12 +96,25 @@ export function redactJsonValue(value: unknown, options: RedactJsonOptions = {},
 
 export function redactString(value: string, options: RedactStringOptions = {}): string {
   return value
+    .replace(/(^|\r?\n)([ \t]*([A-Za-z0-9_-]+)[ \t]*:[ \t]*)[^\r\n]*/g, (line, prefix: string, assignment: string, key: string) => (
+      isSensitiveKey(key, options) ? `${prefix}${assignment}${REDACTED_VALUE}` : line
+    ))
     .replace(/https?:\/\/[^\s"'<>]+/gi, (match) => redactUrl(match, options))
     .replace(SECRET_LIKE_VALUE_GLOBAL_PATTERN, REDACTED_VALUE)
     .replace(/([?&][^=&#\s"'<>]+)=([^&#\s"'<>]+)/g, options.redactQueryAssignments ? `$1=${REDACTED_VALUE}` : "$&")
     .replace(/((?:[A-Za-z0-9_-]*)(?:access[_-]?token|auth|bearer|code|cookie|credential|key|login|nonce|pass|password|secret|session|state|token)(?:[A-Za-z0-9_-]*)(?:["'\s:=]+))[^&#\s"'<>]+/gi, `$1${REDACTED_VALUE}`)
 }
 
+export function redactError(error: unknown, options: RedactStringOptions = {}): Error {
+  const source = error instanceof Error ? error : new Error(String(error))
+  const redacted = new Error(redactString(source.message, options))
+  redacted.name = redactString(source.name, options)
+  if (source.stack) {
+    redacted.stack = redactString(source.stack, options)
+  }
+  return redacted
+}
+
 export function redactUrl(value: string, options: RedactStringOptions = {}): string {
   try {
     const url = new URL(value)
diff --git a/packages/runtime-playground/src/browser-metrics.ts b/packages/runtime-playground/src/browser-metrics.ts
index 37ce68cd5..fe3b7a0d1 100644
--- a/packages/runtime-playground/src/browser-metrics.ts
+++ b/packages/runtime-playground/src/browser-metrics.ts
@@ -1,7 +1,7 @@
 import { createHash } from "node:crypto"
 import { access, readFile } from "node:fs/promises"
 import { join } from "node:path"
-import { redactString, type ArtifactManifest } from "@automattic/wp-codebox-core"
+import { redactError, redactString, type ArtifactManifest } from "@automattic/wp-codebox-core"
 import { isPlainObject as isRecord, now } from "@automattic/wp-codebox-core/internals"
 import type { ConsoleMessage, Request, Response } from "playwright"
 import type {
@@ -636,11 +636,8 @@ export function serializeBrowserConsoleMessage(message: ConsoleMessage): Record<
 }
 
 export function serializeBrowserError(type: BrowserProbeErrorRecord["type"], error: unknown): BrowserProbeErrorRecord {
-  if (error instanceof Error) {
-    return { type, name: error.name, message: error.message, stack: error.stack, timestamp: now() }
-  }
-
-  return { type, name: "Error", message: String(error), timestamp: now() }
+  const sanitized = redactError(error, { redactAllUrlQueryValues: true, redactUrlHash: true, redactQueryAssignments: true })
+  return { type, name: sanitized.name, message: sanitized.message, stack: sanitized.stack, timestamp: now() }
 }
 
 export function jsonLines(records: unknown[]): string {
diff --git a/packages/runtime-playground/src/browser-preview-routing.ts b/packages/runtime-playground/src/browser-preview-routing.ts
index 82eb6edaa..7b19d775f 100644
--- a/packages/runtime-playground/src/browser-preview-routing.ts
+++ b/packages/runtime-playground/src/browser-preview-routing.ts
@@ -1,9 +1,12 @@
-import type { RuntimeCreateSpec } from "@automattic/wp-codebox-core"
+import { redactError, redactString, type RuntimeCreateSpec } from "@automattic/wp-codebox-core"
 import type { BrowserProbeNetworkPolicySummary, BrowserProbePreviewMode, BrowserProbePreviewRouting } from "./browser-artifacts.js"
 import { argValue, commaListArg, strictBooleanArg } from "./commands.js"
 import type { Page, Route } from "playwright"
 
 const BROWSER_PREVIEW_ROUTE_DRAIN_TIMEOUT_MS = 5_000
+const BROWSER_PREVIEW_ROUTE_DOCUMENT_FETCH_ATTEMPTS = 3
+const BROWSER_PREVIEW_ROUTE_SUBRESOURCE_FETCH_ATTEMPTS = 2
+const BROWSER_PREVIEW_ROUTE_RETRY_DELAY_MS = 25
 
 export interface BrowserPreviewNetworkPolicy {
   mode: "allow" | "block" | "record"
@@ -258,8 +261,7 @@ export async function drainBrowserPreviewRouteTracker(tracker: BrowserPreviewRou
   }
 
   if (tracker.errors.length > 0) {
-    const error = tracker.errors[0]
-    throw error instanceof Error ? error : new Error(String(error))
+    throw sanitizeBrowserPreviewRouteError(tracker.errors[0])
   }
 }
 
@@ -310,8 +312,8 @@ async function routeBrowserPreviewNetwork(routePattern: (url: string, handler: (
     try {
       await task
     } catch (error) {
-      tracker?.errors.push(error)
-      throw error
+      tracker?.errors.push(sanitizeBrowserPreviewRouteError(error))
+      await route.abort("failed").catch(() => undefined)
     } finally {
       tracker?.pending.delete(task)
     }
@@ -400,25 +402,42 @@ async function fetchBrowserPreviewRoutedHost(route: Route, requestUrl: URL, poli
     routedUrl.hostname = origin.hostname
     routedUrl.port = origin.port
 
-    let response: Awaited<ReturnType<Route["fetch"]>>
-    try {
-      response = await route.fetch({
-        url: routedUrl.toString(),
-        headers: {
-          ...route.request().headers(),
-          host: currentUrl.host,
-          "x-forwarded-host": currentUrl.host,
-          "x-forwarded-port": currentUrl.port || (currentUrl.protocol === "https:" ? "443" : "80"),
-          "x-forwarded-proto": currentUrl.protocol.replace(":", ""),
-        },
-        maxRedirects: 0,
-      })
-    } catch (error) {
-      if (!isBrowserPreviewRouteFetchRecoverableError(error)) {
-        throw error
+    let response: Awaited<ReturnType<Route["fetch"]>> | undefined
+    const resourceType = route.request().resourceType()
+    const maxAttempts = resourceType === "document" ? BROWSER_PREVIEW_ROUTE_DOCUMENT_FETCH_ATTEMPTS : BROWSER_PREVIEW_ROUTE_SUBRESOURCE_FETCH_ATTEMPTS
+    for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
+      try {
+        response = await route.fetch({
+          url: routedUrl.toString(),
+          headers: {
+            ...route.request().headers(),
+            host: currentUrl.host,
+            "x-forwarded-host": currentUrl.host,
+            "x-forwarded-port": currentUrl.port || (currentUrl.protocol === "https:" ? "443" : "80"),
+            "x-forwarded-proto": currentUrl.protocol.replace(":", ""),
+          },
+          maxRedirects: 0,
+        })
+        break
+      } catch (error) {
+        if (!isBrowserPreviewRouteFetchRecoverableError(error)) {
+          throw sanitizeBrowserPreviewRouteError(error)
+        }
+
+        const retryable = isBrowserPreviewRouteFetchTransientTransportError(error)
+        if (retryable && attempt < maxAttempts) {
+          await wait(BROWSER_PREVIEW_ROUTE_RETRY_DELAY_MS * attempt)
+          continue
+        }
+
+        if (resourceType !== "document" || !retryable) {
+          await route.abort("failed").catch(() => undefined)
+          return undefined
+        }
+        throw browserPreviewRouteFetchExhaustedError(route, currentUrl, attempt, error)
       }
-
-      await route.abort("failed").catch(() => undefined)
+    }
+    if (!response) {
       return undefined
     }
 
@@ -458,13 +477,31 @@ export function isBrowserPreviewRouteFetchRequestContextDisposedError(error: unk
 }
 
 export function isBrowserPreviewRouteFetchRecoverableError(error: unknown): boolean {
-  return isBrowserPreviewRouteFetchRequestContextDisposedError(error) || isBrowserPreviewRouteFetchContentDecodingError(error)
+  return isBrowserPreviewRouteFetchRequestContextDisposedError(error) || isBrowserPreviewRouteFetchContentDecodingError(error) || isBrowserPreviewRouteFetchTransientTransportError(error)
 }
 
 export function isBrowserPreviewRouteFetchContentDecodingError(error: unknown): boolean {
   return error instanceof Error && /\broute\.fetch:\s*failed to decompress\b/i.test(error.message)
 }
 
+export function isBrowserPreviewRouteFetchTransientTransportError(error: unknown): boolean {
+  return error instanceof Error && /\b(?:ECONNRESET|ECONNREFUSED|EPIPE|ETIMEDOUT|UND_ERR_SOCKET|socket (?:hang up|closed|ended)|connection (?:reset|refused|closed)|other side closed)\b/i.test(error.message)
+}
+
+function browserPreviewRouteFetchExhaustedError(route: Route, requestUrl: URL, attempts: number, error: unknown): Error {
+  const method = route.request().method()
+  const resourceType = route.request().resourceType()
+  const classification = isBrowserPreviewRouteFetchTransientTransportError(error) ? "upstream-transport" : "route-fetch"
+  const safeUrl = redactString(requestUrl.toString(), { redactAllUrlQueryValues: true, redactUrlHash: true, redactQueryAssignments: true })
+  const exhausted = new Error(`wordpress.browser-probe route-host fetch failed after ${attempts} attempt(s): classification=${classification} method=${method} resourceType=${resourceType} url=${safeUrl}`)
+  exhausted.name = "BrowserPreviewRouteFetchError"
+  return exhausted
+}
+
+function sanitizeBrowserPreviewRouteError(error: unknown): Error {
+  return redactError(error, { redactAllUrlQueryValues: true, redactUrlHash: true, redactQueryAssignments: true })
+}
+
 function urlProtocol(url: string): string | undefined {
   try {
     return new URL(url).protocol
diff --git a/packages/runtime-playground/src/browser-probe-runner.ts b/packages/runtime-playground/src/browser-probe-runner.ts
index 1125c69e3..4528a97de 100644
--- a/packages/runtime-playground/src/browser-probe-runner.ts
+++ b/packages/runtime-playground/src/browser-probe-runner.ts
@@ -1,4 +1,4 @@
-import { BROWSER_PROBE_BROWSER_VALUES, BROWSER_PROBE_CAPTURE_VALUES, BROWSER_PROBE_CHROMIUM_PROFILE_IDS, BROWSER_PROBE_PROFILES, BROWSER_PROBE_THROTTLE_PROFILE_IDS, browserGeolocation, type BrowserGeolocationPermissionState, type BrowserProbeProfileDefinition, type ExecutionSpec, type RuntimeCreateSpec } from "@automattic/wp-codebox-core"
+import { BROWSER_PROBE_BROWSER_VALUES, BROWSER_PROBE_CAPTURE_VALUES, BROWSER_PROBE_CHROMIUM_PROFILE_IDS, BROWSER_PROBE_PROFILES, BROWSER_PROBE_THROTTLE_PROFILE_IDS, browserGeolocation, redactError, type BrowserGeolocationPermissionState, type BrowserProbeProfileDefinition, type ExecutionSpec, type RuntimeCreateSpec } from "@automattic/wp-codebox-core"
 import { BrowserArtifactSession } from "./browser-artifact-session.js"
 import { BrowserCommandArtifactError } from "./browser-command-artifact-error.js"
 import type { BrowserArtifactFiles, BrowserProbeArtifact, BrowserProbeAuthSummary, BrowserProbeCapabilityDiagnostics, BrowserProbeCheckpointRecord, BrowserProbeContextDetails, BrowserProbeErrorRecord, BrowserProbeLifecycleArtifact, BrowserProbeMemoryArtifact, BrowserProbeNetworkRecord, BrowserProbePerformanceArtifact, BrowserProbeScriptMetadata, BrowserProbeViewport, BrowserProbeWebSocketRecord, BrowserWordPressDiagnosticsSummary } from "./browser-artifacts.js"
@@ -440,8 +440,9 @@ export async function runSingleBrowserProbeCommand({
     }
     finalUrl = page.url()
   } catch (error) {
-    pendingError = error instanceof Error ? error : new Error(String(error))
-    if (isBrowserCommandLivenessError(pendingError)) {
+    const livenessError = isBrowserCommandLivenessError(error)
+    pendingError = redactError(error, { redactAllUrlQueryValues: true, redactUrlHash: true, redactQueryAssignments: true })
+    if (livenessError) {
       await page?.close().catch(() => undefined)
       page = null
     }
@@ -456,7 +457,7 @@ export async function runSingleBrowserProbeCommand({
     try {
       await drainBrowserPreviewRouteTracker(routeTracker)
     } catch (error) {
-      const routeError = error instanceof Error ? error : new Error(String(error))
+      const routeError = redactError(error, { redactAllUrlQueryValues: true, redactUrlHash: true, redactQueryAssignments: true })
       if (!pendingError && runPlan.routeHostDrain === "required") {
         pendingError = routeError
         progress.fail("probe-error", routeError)
@@ -674,7 +675,7 @@ export async function runBoundedBrowserDiagnostic<T>({
     })
     return { ok: true, value }
   } catch (error) {
-    const normalized = error instanceof Error ? error : new Error(String(error))
+    const normalized = redactError(error, { redactAllUrlQueryValues: true, redactUrlHash: true, redactQueryAssignments: true })
     onError(normalized)
     return { ok: false, error: normalized }
   }
diff --git a/tests/browser-preview-routing.test.ts b/tests/browser-preview-routing.test.ts
new file mode 100644
index 000000000..28c1eff38
--- /dev/null
+++ b/tests/browser-preview-routing.test.ts
@@ -0,0 +1,151 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+
+import type { BrowserContext, Route } from "playwright"
+
+import { browserPreviewNetworkPolicy, browserPreviewRouting, createBrowserPreviewRouteTracker, drainBrowserPreviewRouteTracker, isBrowserPreviewRouteFetchContentDecodingError, isBrowserPreviewRouteFetchRecoverableError, isBrowserPreviewRouteFetchRequestContextDisposedError, isBrowserPreviewRouteFetchTransientTransportError, routeBrowserPreviewContextNetwork } from "../packages/runtime-playground/src/browser-preview-routing.js"
+import { jsonLines, serializeBrowserError } from "../packages/runtime-playground/src/browser-metrics.js"
+
+const SENTINELS = ["SENTINEL_COOKIE_2094", "SENTINEL_AUTH_2094", "SENTINEL_NONCE_2094", "SENTINEL_TOKEN_2094"]
+const ROUTED_URL = "http://routed.test/wp-includes/app.js?token=SENTINEL_TOKEN_2094"
+
+test("routed fetch classifiers include transport resets and preserve disposal/decompression recovery", () => {
+  assert.equal(isBrowserPreviewRouteFetchTransientTransportError(routeFetchError("read ECONNRESET")), true)
+  assert.equal(isBrowserPreviewRouteFetchTransientTransportError(routeFetchError("connect ECONNREFUSED")), true)
+  assert.equal(isBrowserPreviewRouteFetchTransientTransportError(routeFetchError("socket hang up")), true)
+  assert.equal(isBrowserPreviewRouteFetchRequestContextDisposedError(routeFetchError("Request context disposed.")), true)
+  assert.equal(isBrowserPreviewRouteFetchContentDecodingError(routeFetchError("failed to decompress 'br' encoding")), true)
+  assert.equal(isBrowserPreviewRouteFetchRecoverableError(routeFetchError("read ECONNRESET")), true)
+})
+
+test("subresource resets retry once, abort safely, and never reject the route callback", async () => {
+  const fixture = await routedFixture("script", [routeFetchError("read ECONNRESET"), routeFetchError("socket closed")])
+  await assert.doesNotReject(fixture.run())
+  assert.equal(fixture.fetchCalls(), 2)
+  assert.equal(fixture.abortCalls(), 1)
+  assert.equal(fixture.tracker.errors.length, 0)
+  assert.equal(fixture.tracker.pending.size, 0)
+})
+
+test("document resets retry deterministically and fulfill after recovery", async () => {
+  const response = routedResponse()
+  const fixture = await routedFixture("document", [routeFetchError("connect ECONNREFUSED"), routeFetchError("read ECONNRESET"), response])
+  await assert.doesNotReject(fixture.run())
+  await assert.doesNotReject(drainBrowserPreviewRouteTracker(fixture.tracker))
+  assert.equal(fixture.fetchCalls(), 3)
+  assert.equal(fixture.fulfilledResponse(), response)
+  assert.equal(fixture.abortCalls(), 0)
+})
+
+test("exhausted document resets fail through a sanitized tracker error without leaking to persisted surfaces", async () => {
+  const fixture = await routedFixture("document", [routeFetchError("read ECONNRESET"), routeFetchError("read ECONNRESET"), routeFetchError("read ECONNRESET")])
+  await assert.doesNotReject(fixture.run())
+  assert.equal(fixture.fetchCalls(), 3)
+  assert.equal(fixture.abortCalls(), 1)
+  assert.equal(fixture.tracker.pending.size, 0)
+  assert.equal(fixture.tracker.errors.length, 1)
+
+  const tracked = fixture.tracker.errors[0]
+  await assert.rejects(drainBrowserPreviewRouteTracker(fixture.tracker), /classification=upstream-transport.*resourceType=document.*token=\[redacted\]/)
+  const serialized = serializeBrowserError("probe-error", tracked)
+  const persistedSurfaces = {
+    stdout: JSON.stringify(serialized),
+    stderr: tracked instanceof Error ? `${tracked.message}\n${tracked.stack}` : String(tracked),
+    diagnostics: JSON.stringify({ errors: [serialized] }),
+    manifest: JSON.stringify({ files: [{ diagnostics: serialized }] }),
+    artifact: jsonLines([serialized]),
+    tracker: JSON.stringify(fixture.tracker.errors.map((error) => serializeBrowserError("probe-error", error))),
+    snapshot: JSON.stringify(serialized),
+  }
+  for (const [surface, contents] of Object.entries(persistedSurfaces)) {
+    for (const sentinel of SENTINELS) assert.doesNotMatch(contents, new RegExp(sentinel), `${surface} must not contain ${sentinel}`)
+  }
+})
+
+test("concurrent routed requests drain after independent retry and cleanup", async () => {
+  const first = await routedFixture("script", [routeFetchError("read ECONNRESET"), routedResponse()])
+  const second = await routedFixture("image", [routeFetchError("socket ended"), routeFetchError("socket ended")], first.tracker)
+  await Promise.all([first.run(), second.run()])
+  await assert.doesNotReject(drainBrowserPreviewRouteTracker(first.tracker))
+  assert.equal(first.tracker.pending.size, 0)
+  assert.equal(first.fetchCalls(), 2)
+  assert.equal(second.fetchCalls(), 2)
+  assert.equal(second.abortCalls(), 1)
+})
+
+test("disposed contexts and decompression failures abort without retrying or tracking errors", async () => {
+  for (const message of ["Request context disposed.", "failed to decompress 'gzip' encoding"]) {
+    const fixture = await routedFixture("document", [routeFetchError(message)])
+    await assert.doesNotReject(fixture.run())
+    await assert.doesNotReject(drainBrowserPreviewRouteTracker(fixture.tracker))
+    assert.equal(fixture.fetchCalls(), 1)
+    assert.equal(fixture.abortCalls(), 1)
+  }
+})
+
+async function routedFixture(resourceType: string, outcomes: unknown[], tracker = createBrowserPreviewRouteTracker()) {
+  let handler: ((route: Route) => Promise<void>) | undefined
+  let fetchCalls = 0
+  let abortCalls = 0
+  let fulfilled: unknown
+  const context = {
+    route: async (_pattern: string, nextHandler: (route: Route) => Promise<void>) => {
+      handler = nextHandler
+    },
+  } as BrowserContext
+  const preview = browserPreviewRouting([], undefined, "http://127.0.0.1:9400")
+  const policy = browserPreviewNetworkPolicy([], ["routed.test"], preview)
+  await routeBrowserPreviewContextNetwork(context, policy, preview.effectiveOrigin, tracker)
+
+  const route = {
+    request: () => ({
+      url: () => ROUTED_URL,
+      method: () => "GET",
+      resourceType: () => resourceType,
+      headers: () => ({
+        cookie: `wordpress_logged_in=${SENTINELS[0]}`,
+        authorization: `Bearer ${SENTINELS[1]}`,
+        "x-wp-nonce": SENTINELS[2],
+        "x-session-token": SENTINELS[3],
+      }),
+    }),
+    fetch: async () => {
+      const outcome = outcomes[Math.min(fetchCalls, outcomes.length - 1)]
+      fetchCalls += 1
+      if (outcome instanceof Error) throw outcome
+      return outcome
+    },
+    abort: async () => {
+      abortCalls += 1
+    },
+    fulfill: async ({ response }: { response: unknown }) => {
+      fulfilled = response
+    },
+    continue: async () => {},
+  } as unknown as Route
+
+  return {
+    tracker,
+    run: async () => {
+      assert(handler)
+      await handler(route)
+    },
+    fetchCalls: () => fetchCalls,
+    abortCalls: () => abortCalls,
+    fulfilledResponse: () => fulfilled,
+  }
+}
+
+function routeFetchError(reason: string): Error {
+  const message = `route.fetch: ${reason}\nCall log:\n  - → GET ${ROUTED_URL}\n    cookie: wordpress_logged_in=${SENTINELS[0]}\n    authorization: Bearer ${SENTINELS[1]}\n    x-wp-nonce: ${SENTINELS[2]}\n    x-session-token: ${SENTINELS[3]}`
+  const error = new Error(message)
+  error.stack = `Error: ${message}`
+  return error
+}
+
+function routedResponse() {
+  return {
+    status: () => 200,
+    headers: () => ({}),
+  }
+}
diff --git a/tests/redaction.test.ts b/tests/redaction.test.ts
index 64b6ae24e..1e0c669c6 100644
--- a/tests/redaction.test.ts
+++ b/tests/redaction.test.ts
@@ -1,6 +1,6 @@
 import assert from "node:assert/strict"
 import { readFile } from "node:fs/promises"
-import { containsSecretLikeValue, isRedactedValue, isSensitiveKey, redactJsonValue, redactString, redactUrl, type RedactionPolicyProfileName } from "../packages/runtime-core/src/redaction.js"
+import { containsSecretLikeValue, isRedactedValue, isSensitiveKey, redactError, redactJsonValue, redactString, redactUrl, type RedactionPolicyProfileName } from "../packages/runtime-core/src/redaction.js"
 
 const sensitiveKeyCases: Array<[string, boolean]> = [
   ["token", true],
@@ -49,6 +49,19 @@ assert.equal(
   "https://example.com/path?plain=ok&token=[redacted]#frag",
 )
 
+const headerSentinels = ["SENTINEL_COOKIE_2094", "SENTINEL_AUTH_2094", "SENTINEL_NONCE_2094", "SENTINEL_TOKEN_2094"]
+const headerLog = `route.fetch: read ECONNRESET\n  cookie: wordpress_logged_in=${headerSentinels[0]}; preference=visible\nAuthorization: Bearer ${headerSentinels[1]}\nx-wp-nonce: ${headerSentinels[2]}\nx-session-token: ${headerSentinels[3]}\naccept: text/html`
+const redactedHeaderLog = redactString(headerLog)
+assert.match(redactedHeaderLog, /cookie: \[redacted\]/i)
+assert.match(redactedHeaderLog, /authorization: \[redacted\]/i)
+assert.match(redactedHeaderLog, /x-wp-nonce: \[redacted\]/i)
+assert.match(redactedHeaderLog, /x-session-token: \[redacted\]/i)
+assert.match(redactedHeaderLog, /accept: text\/html/i)
+for (const sentinel of headerSentinels) assert.doesNotMatch(redactedHeaderLog, new RegExp(sentinel))
+
+const redactedError = redactError(Object.assign(new Error(headerLog), { stack: `Error: ${headerLog}` }))
+for (const sentinel of headerSentinels) assert.doesNotMatch(`${redactedError.message}\n${redactedError.stack}`, new RegExp(sentinel))
+
 const fixture = JSON.parse(await readFile(new URL("./fixtures/redaction-policy-profiles.json", import.meta.url), "utf8")) as {
   profiles: Record<RedactionPolicyProfileName, { redact: string[]; preserve: string[] }>
 }