[davidschachterADFA]

ADFA-6589

The app's documentation WebViews no longer connect off the device. A request they can't serve locally gets an empty local response, and a tapped link to another site asks before opening in the browser.

Cause

Documentation pages reference YouTube players, images on developer.android.com and kotl.in, and, in newer databases, Google Fonts. A WebView fetches whatever its WebViewClient doesn't answer:

• HelpActivity, IDETooltipWebViewFragment and FAQActivity passed every request the documentation interceptor declined to super.shouldInterceptRequest, which goes to the network.
• The tooltip popup (ToolTipManager) renders tooltip HTML with no interceptor at all.
• Tapped links to other sites opened in place, with no warning. Only HelpActivity checked links, and only for mailto:, tel: and sms:.

Change

New common/.../documentation/OffDeviceRequests.kt, used by all four WebViews:

• block(request) sits between the interceptor and the network. An http(s) request to any host other than the device itself (localhost, 127.x.x.x, ::1) gets an empty 204. Requests to localhost still reach WebServer as before.
• openWithConsent(activity, url) sends an off-device link through UrlManager.openUrl's existing consent dialog (Cancel, Proceed, Don't ask again), which opens it in the browser. It takes an Activity because UrlManager.openUrl asks only when given one; with any other context it opens the link without asking. That matters for IDETooltipWebViewFragment, whose view is inflated from the application context.
• keepOnDevice(settings) closes two ways a WebView reaches the network that block doesn't see. It turns Safe Browsing off: Safe Browsing has Google Play services send Google hash prefixes of the addresses a WebView loads, charged to the app, even when block answers the request locally, so the block alone still sent them (see Testing). And it gives service-worker fetches, which go to the ServiceWorkerClient rather than a WebView's client, the same block. That client is process-wide and stays set: from the first documentation WebView on, it covers every WebView in the app, plugins' included; a plugin that sets its own replaces it only until the next documentation WebView or tooltip popup sets CoGo's again. Commits 8eff34c, 50d765e, b93ae84, 5d2df3a and 7f924e3.
• The host check fails closed. An http(s) URL it can't parse counts as off-device, and neither http://localhost@example.com nor http://localhost.example.com passes as local. Where java.net.URI rejects a URL Chromium accepts (a | in a query), it reads scheme://authority as Chromium does: leading and trailing spaces and control characters dropped, and tabs and line breaks anywhere, the authority ending at /, \, ? or #, and the host after the last @ (b93ae84, 5d2df3a, 7f924e3).

Wired into the four WebViews below. Each also calls keepOnDevice before loading anything:

• HelpActivity: requests, tapped links, and an off-device URL passed in its intent. A link in a tooltip's text can name any site and reaches Help through launch().
• IDETooltipWebViewFragment and FAQActivity: requests and tapped links.
• The tooltip popup: requests, and a tapped off-device link, which now gets the consent dialog over the editor instead of opening in Help. If the popup's own context isn't an Activity, it uses the anchor view's; with neither, it stays open and shows "This link can't be opened from here." (53a40ee, from CodeRabbit's review). Its sponsor button uses the same fallback and is hidden when neither context is an Activity, since UrlManager asks for consent only when given one (b93ae84, 5d2df3a).

Why not WebSettings.blockNetworkLoads, which the ticket suggested as a backstop: it would also block requests to WebServer on localhost:6174, which the /pr/ endpoints and the CodeOnTheGo.nointercept fallback use. What the block can't see: <link rel=preconnect> and dns-prefetch (or the same in a Link: response header), WebSockets, WebRTC, and each hop of a redirect all reach the network without shouldInterceptRequest. No documentation page uses any of them: every text row of the 2026-10-13 and APK-bundled databases was decoded and scanned, and tooltip texts load nothing remote. Neither WebServer nor the interceptor sends a redirect or a Link: header. Plugin pages installed by PluginDocumentationManager could use them; that's a possible follow-up.

docs/documentation-database.md is updated: it said the WebView "will happily follow" an off-device link.

Not in this PR:

• The content side of ADFA-6589: draft OfflineDocumentationTools #41 removes the commented-out Google Fonts block, stores the remote API diagrams locally, and replaces the YouTube players, kotl.in badges and remote image sources with links, words or local copies. Until a database built with it ships, those pages show no player or image.
• The markdown preview plugin has the same problem with a user's own files: ADFA-6607.

Testing

• New OffDeviceRequestsTest, 12 tests:
  • the device's own hosts;
  • other hosts;
  • hosts that only mention localhost, including a backslash before the @;
  • unparseable URLs;
  • spaces around a URL, and tabs and line breaks inside one;
  • local URLs that java.net.URI rejects, read as Chromium reads them;
  • other schemes;
  • an off-device request gets a response;
  • an on-device request falls through;
  • only off-device links reach the consent dialog;
  • the consent dialog falls back to the anchor view's Activity;
  • Safe Browsing is turned off and service-worker fetches are blocked.
• Mutation checks: each of these fails the test written for it:
  • a naive startsWith("http://localhost") check;
  • failing open on a parse error;
  • no scheme check;
  • block that never blocks;
  • consent for every link;
  • localhost not recognised;
  • keepOnDevice without the service-worker block;
  • activityFor looking only at the first context;
  • treating every URL that java.net.URI rejects as off-device;
  • any IPv6 literal counting as local;
  • a case-sensitive scheme check on the fallback path;
  • a fallback authority that doesn't end at a backslash;
  • no dropping of spaces around the URL;
  • no dropping of tabs and line breaks inside it.
• :common:testV8DebugUnitTest (217) and :idetooltips:testV8DebugUnitTest (4) pass at 7f924e3. :app, :common and :idetooltips compile at 5d2df3a; 7f924e3 changes only a private function's body, a test and docs.
• On a Pixel 6 Pro (Android 17), checked through the WebView's DevTools with the cache off, and through the app's per-UID network statistics (dumpsys netstats, which doesn't count loopback traffic to WebServer):

Page	Before (previous build, DevTools offline mode)	After (this build, network live)
k/html/advent-of-code.html	www.youtube.com request reached the network: ERR_INTERNET_DISCONNECTED	local 204, no remote IP
a/android/app/Activity.html	developer.android.com image reached the network: ERR_INTERNET_DISCONNECTED	local 204, no remote IP
Help home, i/index.html	38 requests, all local	38 requests, all local
App's off-device bytes, all three pages	-	0 received, 0 sent

• The "before" run used DevTools' offline mode, meant to show the requests leaving without connecting. That mode didn't stop everything: during that run the app exchanged 37,876 bytes (30,661 received, 7,215 sent), all under socket tag 0x4001804. The WebView's own requests did fail, as DevTools showed. Those bytes were Google Play services' Safe Browsing checking the two URLs on the WebView's behalf. Play services' Safe Browsing client loads 0x1804 next to safebrowsing.googleapis.com/v4/fullHashes:find, and Play services charges that traffic to the app's UID. Its SafeBrowsingService started during the run. Offline mode governs only the WebView's network stack, not Play services. The fixed build then exchanged 0 bytes on the same pages at 16:19.
• On the phone's bundled database, the home page mentions Google Fonts only in a comment, so the fonts case wasn't exercised there. It takes the same path as the other two.
• A navigation to https://example.com/... brought up the consent dialog with the full URL. Cancel kept Help on its page, and the app sent 0 bytes.
• Safe Browsing has to be off. The 16:19 result was 0 only because Safe Browsing had cached its answers from the 16:15 run:

Build	Pages	Off-device requests	App's off-device bytes	Off-device sockets	Safe Browsing binds
Block only (0fba86c), 17:11	2	2, answered locally	15,234 (tag 0x4001804)	not watched	2
Block + Safe Browsing off (8eff34c), 17:13	6	8, answered locally	0	0	0

Off-device sockets come from polling /proc/net/tcp* for the app's UID throughout the run. The six pages are i/advanced-features.html, a/android/hardware/SensorEvent.html, k/html/components-stability.html, k/kotlin-reflect/index.html, k/html/advent-of-code.html and a/android/app/Activity.html. The blocked requests went to developer.android.com, kotl.in and YouTube.

• The tooltip popup (build with 8eff34c, a test copy of the 2026-10-13 database with one link added to the Quick run tooltip): tapping the link closed the popup and brought up the consent dialog over the editor; Cancel left the editor unchanged, and the app's off-device traffic did not change. Details in this comment.
• Not driven on the phone: the tooltip fragment and FAQ, which use the same calls and compile, and the popup with no Activity, where the sponsor button is now hidden, such as one shown from the debugger's overlay window.
• No screen was added or changed, so there was no font-scale check. The consent dialog is UrlManager's existing one.

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📒 Files selected for processing: 4

• common/src/main/java/com/itsaky/androidide/documentation/OffDeviceRequests.kt
• common/src/test/java/com/itsaky/androidide/documentation/OffDeviceRequestsTest.kt
• docs/documentation-database.md
• idetooltips/src/main/java/com/itsaky/androidide/idetooltips/ToolTipManager.kt

🚧 Files skipped from review as they are similar to previous changes: 1

• docs/documentation-database.md

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📝 Summary

• Documentation WebViews in HelpActivity, FAQActivity, IDETooltipWebViewFragment, and the tooltip popup return a local empty 204 response for off-device HTTP(S) requests.
• Requests to localhost, ::1, and hosts matching 127.x.x.x continue to the local documentation handler and WebServer.
• Off-device links use UrlManager.openUrl’s consent dialog before opening in the browser. This also applies to off-device URLs passed to HelpActivity.
• The WebViews disable Safe Browsing and apply the request block to service-worker fetches.
• Tests cover URL classification, request blocking, consent routing, Activity lookup, and service-worker handling. The PR reports 216 :common and 4 :idetooltips unit tests passing, and compilation of :app, :common, and :idetooltips.
• Risks: External fonts, images, and media receive an empty local response and do not display. The PR reports that the tooltip fragment, FAQ, and tooltip popup were not tested on-device.
• Risks: The request block does not cover preconnect, DNS-prefetch, WebSockets, WebRTC, or redirect hops. The documentation states that its pages and local server do not use these mechanisms; plugin pages could.
• Risk: The service-worker client is process-wide, remains set, and affects plugin WebViews. A plugin can replace it with its own client.
• Risk: The IPv4 loopback check accepts one to three digits per component. It can treat invalid addresses, such as 127.999.1.1, as on-device.

The change adds shared URL classification and handling for off-device requests. Documentation WebViews and tooltip popups block off-device resource requests and route off-device links through consent handling. Safe Browsing is disabled, and service-worker requests use the shared blocking behavior.

Changes: Off-device WebView handling

Layer / File(s)	Summary
Shared URL classification and handling common/src/main/java/com/itsaky/androidide/documentation/OffDeviceRequests.kt, common/src/test/java/com/itsaky/androidide/documentation/OffDeviceRequestsTest.kt, docs/documentation-database.md	OffDeviceRequests treats non-HTTP(S) URLs and loopback hosts as on-device. It returns an empty 204 response for off-device resource requests and sends off-device URLs to UrlManager.openUrl. Tests cover classification, blocking, consent handling, Activity lookup, and service-worker configuration. Documentation describes the behavior and its scope.
Documentation WebView integration app/src/main/java/com/itsaky/androidide/activities/editor/FAQActivity.kt, app/src/main/java/com/itsaky/androidide/fragments/IDETooltipWebViewFragment.kt, common/src/main/java/com/itsaky/androidide/activities/editor/HelpActivity.kt	These WebViews apply OffDeviceRequests after the documentation interceptor declines a resource. Their off-device navigation handling uses consent handling. Safe Browsing is disabled.
Tooltip WebView integration idetooltips/src/main/java/com/itsaky/androidide/idetooltips/ToolTipManager.kt, resources/src/main/res/values/strings.xml	The tooltip WebView blocks off-device resource requests and disables Safe Browsing. Off-device links request consent and dismiss the popup when an Activity is available. Otherwise, the popup remains open and a toast appears. The sponsor button is shown and opens its URL only when an Activity is available.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant WebView
  participant OffDeviceRequests
  participant UrlManager
  WebView->>OffDeviceRequests: Check resource URL or navigation URL
  OffDeviceRequests-->>WebView: Return empty 204 for off-device resource
  OffDeviceRequests->>UrlManager: Open off-device link with consent
  UrlManager-->>OffDeviceRequests: Return consent-handling result
  OffDeviceRequests-->>WebView: Return navigation-handling result

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Suggested reviewers: itsaky-adfa, hal-eisen-adfa

Merge Risk: ⚪ Minimal · up to 5d2df

No actionable issue remains from the reviewed changes; the PR is ready to merge after normal checks.

Security architecture risk: 🔵 Low · up to 5d2df

The change reduces ordinary off-device requests and adds consent before external navigation. No introduced security failure was demonstrated in the inspected flows. Remaining uncertainty concerns browser paths outside request interception and the lifetime of the shared service-worker policy.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• observed — The direct boundary change affects documentation and tooltip content in the app process. Plugin-provided HTML enters the same documentation database, and the service-worker policy can additionally affect other WebViews in that process. This is not evidence of a new plugin privilege or a demonstrated cross-WebView security failure.

Trust Boundaries and Controls

• observed — Consent cancellation performs no external launch. Proceed launches without persisting approval; Don't ask again stores the exact URL before launching. An external-launch failure reports an error without falling back to an in-WebView load. The popup consumes an off-device tap without launching when no Activity can be found.
• inferred — The fragment's Activity-null fallback does not establish a newly introduced off-device escape. Default navigation existed at the base, and the head adds resource blocking independently of Activity availability. Whether a detached fragment can still receive navigation callbacks remains unresolved.

Resilience and Maintainability Implications

• observed — Policy initialization changes per-view Safe Browsing and the global service-worker client sequentially, without transactional rollback or replacement monitoring. Normal setup orders this before content loading. Setter failure and competing replacement were considered, but no exercised insecure partial state was established.

Hardening Proposals

• proposed — If the on-device guarantee must extend to arbitrary future or plugin-authored HTML, define controls for browser paths outside request interception and explicit ownership of the process-wide service-worker client, while preserving required localhost access. This is prospective hardening, not a demonstrated PR vulnerability.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 43.24% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 37 functions across 6 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The description clearly explains the WebView request blocking, consent handling, Safe Browsing changes, testing, and scope. It is directly related to the changeset.
Title check		The title clearly and concisely identifies the main change: preventing the app's WebViews from connecting off the device.

Full details: Docstring Coverage

Explanation

Docstring coverage is 43.24% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 37 functions across 6 files. (1 skipped: 1 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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_{A rabbit checks each link with care,
Keeps distant fetches from the air.
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Actionable comments posted: 1

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@idetooltips/src/main/java/com/itsaky/androidide/idetooltips/ToolTipManager.kt:
- Around line 377-380: Update the off-device click handling in ToolTipManager to
try anchorView.context.findActivity() when context.findActivity() returns no
Activity. If neither context provides an Activity, keep the popup open and
report that the link cannot open; return true only after opening the link with
consent.

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📒 Files selected for processing: 7

• app/src/main/java/com/itsaky/androidide/activities/editor/FAQActivity.kt
• app/src/main/java/com/itsaky/androidide/fragments/IDETooltipWebViewFragment.kt
• common/src/main/java/com/itsaky/androidide/activities/editor/HelpActivity.kt
• common/src/main/java/com/itsaky/androidide/documentation/OffDeviceRequests.kt
• common/src/test/java/com/itsaky/androidide/documentation/OffDeviceRequestsTest.kt
• docs/documentation-database.md
• idetooltips/src/main/java/com/itsaky/androidide/idetooltips/ToolTipManager.kt

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Independent review

An independent Claude Code review covered this PR at 53a40ee. It has no critical or high findings, one medium and eight low or nit. All but R2161-02 are addressed in b93ae84.

ID	Sev	Finding	Status
R2161-01	medium	The block was described as complete, but preconnect, dns-prefetch, WebSockets, service workers and redirect hops skip shouldInterceptRequest	Claim corrected in the KDoc, docs and this description; service-worker fetches now get the block too
R2161-02	low	The tooltip popup's link handling, the one live changed path, was never run on a device	Open: needs the 2026-10-13 database on a phone (see below)
R2161-03	low	Mutations survived: any IPv6 literal counted as local; an upper-case scheme failed open on the parse-failure path	Fixed: both are tested, and the mutations now fail
R2161-04	low	java.net.URI rejects some characters a canonical URL keeps, so such local URLs counted as off-device	Fixed: those fall back to reading scheme://authority
R2161-05	low	The popup's sponsor button passed a context UrlManager may not ask consent with	Fixed: it uses the same Activity fallback as links
R2161-06	nit	A private copy of ContextUtils.findActivity	Fixed: the copy is gone
R2161-07	nit	The docs' "five sites" list gained a sixth entry that reads no database	Fixed: it's described in its own paragraph
R2161-08	nit	"Sends the addresses to Google": the lookups carry hash prefixes	Fixed: reworded
R2161-09	nit	A stale comment in HelpActivity	Fixed

R2161-01:

• What reaches shouldInterceptRequest, and what doesn't:
  • <link rel=dns-prefetch> and preconnect, whether tags or Link: headers, open connections directly.
  • WebSockets aren't intercepted.
  • A redirect hop goes straight to the network.
  • Service-worker fetches go to ServiceWorkerClient.
• Who can reach them: no first-party content uses any of them. Every text row of both databases was decoded and scanned, and the local server never redirects or sends Link:. Plugin pages installed by PluginDocumentationManager could; that's left as a possible follow-up.
• What changed: keepOnDevice (formerly disableSafeBrowsing) now also gives the process-wide ServiceWorkerClient the same block.

R2161-02: in the 2026-10-13 database the only tooltip with an off-device link is category xml, tag defaultLocale (a link to rfc-editor.org). The phone runs a build bundling an older database without it. Testing it means putting the newer database where Help reads debug copies, /sdcard/Download/documentation.db. Until then it belongs in Steps to QA:

long-press android:defaultLocale, tap the link, and check that the consent dialog appears over the editor and that Cancel leaves the editor alone.

Reachability notes from the review:

• openFAQActivity has no callers.
• IDETooltipWebviewFragment is declared only in activity_main.xml, with no URL.

So the tooltip popup is the only live path besides Help.

Mutations at b93ae84: four more were run against the new tests, and each failed its own test:

• the fallback treating every unparseable URL as off-device;
• no service-worker client;
• a case-sensitive fallback scheme;
• any IPv6 literal counted as local.

:common (216) and :idetooltips (4) tests pass, :app compiles, and Spotless changes nothing.

Checked and found correct

• Coverage: requests the interceptor declines get a local 204 in all four WebViews, and tapped off-device links warn and can be cancelled. Rejecting blockNetworkLoads is justified.
• Host check: userinfo, look-alike hosts, case, [::1] and parse failures behave as named.
• Order and timing: interceptor, then block, then super, everywhere. Safe Browsing is off before the first load in all four.
• Navigations: iframe navigations are blocked by the 204. window.open and _blank become top-level navigations and get the dialog. Navigations without a user gesture in both databases all target local pages.
• Safe Browsing: the setting is per WebView and read on each check. Its checks run even when shouldInterceptRequest answers, which matches the phone measurement.
• Siblings: the markdown preview plugin (ADFA-6607) and Termux help (ADFA-6608) are filed separately.

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R2161-02: tested on the phone (Pixel 6 Pro, Android 17, build with 8eff34c). No project file contains android:defaultLocale, so instead of typing into a project, a test copy of the 2026-10-13 database with one link (https://example.com/adfa-6589-popup-test) added to the Quick run button's tooltip went into the debug-override path, and the phone's own copy was backed up and restored afterwards (checksum and timestamp verified).

• Long-press Quick run: the tooltip popup shows the link.
• Tap the link: the popup closes, "Open external link?" appears over the editor with the full address, and Help does not open.
• Cancel: the dialog closes and the editor is unchanged.
• The app's off-device traffic (dumpsys netstats, per UID) did not change at any step.

The later commits (53a40ee, b93ae84) change this path only when the popup has no Activity; with the editor's Activity, as here, the behaviour is the same.

[davidschachterADFA]

Second independent review

A second independent Claude Code review covered this PR at b93ae84. It confirmed that b93ae84 closes R2161-01 and R2161-03 to 09. It has no critical, high or medium findings: four low and six nits, all fixed in 5d2df3a.

ID	Sev	Finding	Status
R2161B-01	low	The fallback read http://evil.com\@localhost/ as local: Chromium ends an authority at \ too	Fixed
R2161B-02	low	Two fallback mutants that pass off-device URLs as local survived	Fixed: both now fail
R2161B-03	low	With no Activity (the debugger overlay) the sponsor button only showed a Toast	Fixed: hidden there
R2161B-04	low	The service-worker block is process-wide and permanent, which wasn't documented	Fixed: KDoc and docs say so
R2161B-05	nit	The "Lazy" comment was false; the test's constructor mocks weren't needed	Fixed: both removed
R2161B-06	nit	The test's #b c is not a URL Chromium hands over	Fixed: #b|c
R2161B-07	nit	The comment said the fallback returns the host; it returned, and logged, the whole URL	Fixed: returns the host
R2161B-08	nit	"addresses a WebView loads up with Google" misreads	Fixed: "sends Google hash prefixes of the addresses"
R2161B-09	nit	The description listed 10 of 11 tests	Fixed: all 12 listed
R2161B-10	nit	WebRTC was missing from what the block can't see	Fixed: added

R2161B-01:

• The fallback now strips leading and trailing spaces and control characters, as Chromium does. Its authority ends at /, \, ? or #.
• New test cases:
  • http://evil.com\@localhost/ (in the "only mentions localhost" test);
  • a new test with http://evil.com/x|y and \thttps://evil.com/\n.
• As the review noted, only HelpActivity's intent extra could carry such a URL. Even then, block would have answered the load with a 204.

R2161B-02: both URLs the review suggested, http://[2001:db8::1]/x|y and http://evil.com/x|y?u=a@localhost:1, are in the java.net.URI test now.

R2161B-10: no documentation page uses WebRTC. Every text row of the 2026-10-13 database has 0 RTCPeerConnection or getUserMedia.

How it was checked at 5d2df3a:

• Reverts and mutants: each fails the test named for it, with the file restored and byte-compared after each run:
  • the backslash taken out of the regex;
  • no trimming of surrounding spaces;
  • the review's M1 (every bracketed host read as ::1);
  • the review's M2 (a greedy authority).
• Not covered by a unit test:
  • R2161B-07 changes only what block logs.
  • The hidden sponsor button needs a popup with no Activity. It compiles, and wasn't run on a device.
• :common (217) and :idetooltips (4) tests pass, :app compiles, and spotlessCheck passes.

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[davidschachterADFA]

Independent review of the fix commits

An independent Claude Code review covered 5d2df3a, which answers the second independent review (R2161B-01 to R2161B-10). It has 1 low and 1 nit. All ten R2161B findings are addressed. Every mutation check named for this commit fails its test, and the counts match. R2161-10 is a gap of the same kind as R2161B-01: like that one, it is reachable only through HelpActivity's intent extra, and block stops the request there. All are open.

ID	Sev	File:line	Finding
R2161-10	low	OffDeviceRequests.kt:127, :145	A tab or newline inside the scheme makes an off-device URL read as local
R2161-11	nit	OffDeviceRequests.kt:107-109	"A plugin that sets its own replaces it" leaves out that CoGo sets its own back

R2161-10.

• Reproduced: a scratch test, since deleted, at 5d2df3a returns isOffDevice(...) == false for "http\n://evil.com/x", "ht\ttp://evil.com/x" and "https\r\n://evil.com/x". For "http:\n//evil.com/x", "http://ev\nil.com/x" and "http://local\nhost:6174/x" it returns true, failing closed.
• Cause: trim { it <= ' ' } drops only leading and trailing characters. The URL Standard, which Chromium follows, also removes every ASCII tab, CR and LF inside a URL, so Chromium reads all three URLs above as http(s)://evil.com/x. java.net.URI rejects them. AUTHORITY can't match, because the control character splits the scheme from ://. The startsWith("http:") check also fails, so offDeviceHostOfUnparsed returns null, meaning "on the device". That contradicts the isOffDevice KDoc ("Fails closed: an http(s) URL that cannot be parsed ... counts as off-device") and the PR body ("reads scheme://authority as Chromium does").
• Reach: block and shouldOverrideUrlLoading get canonical URLs from Chromium, so they are not affected. Only HelpActivity.updateUIFromIntent passes a raw string. With such a URL it would skip the consent dialog and call loadUrl. block would then answer the canonical request with a 204, so the result is a blank page, not traffic. All current callers pass constant local URLs.
• Suggested fix: after the trim, drop interior tabs and line breaks: .filterNot { it == '\t' || it == '\n' || it == '\r' }. Add "http\n://evil.com/x" to spaces around a URL do not hide its host. Canonical URLs never contain these characters, so nothing that passes today changes.

R2161-11.

• Reproduced: keepOnDevice calls ServiceWorkerController.getInstance().setServiceWorkerClient(serviceWorkerClient) every time it runs, and it runs for each tooltip popup (ToolTipManager.kt:399) and in HelpActivity, FAQActivity and IDETooltipWebViewFragment.
• Cause: the new KDoc and docs/documentation-database.md:82 say "a plugin that sets its own replaces it". Neither says that the next tooltip popup or documentation screen puts CoGo's client back, so a plugin's client lasts only until the user opens another tooltip. A plugin author who reads either text would expect their client to stay set.
• Suggested fix: add a few words to both: "... replaces it until the next documentation WebView or tooltip popup sets this one again."

Earlier findings

ID	Verdict	Evidence
R2161B-01	Fixed, except R2161-10	Removing \\ from AUTHORITY fails a host that only mentions localhost (http://evil.com\@localhost/). Removing the trim fails spaces around a URL do not hide its host
R2161B-02	Fixed	Every bracketed host read as ::1 fails, and so does a greedy (.*) authority (a local URL that java_net_URI rejects). jshell confirms that java.net.URI rejects every URL in that test, so they all reach the fallback
R2161B-03	Fixed, not unit-tested	The button is GONE unless level >= 1 and an Activity exists, and the Toast branch is gone. Not run on a device, as the author says
R2161B-04	Fixed, except R2161-11	The KDoc and docs say "process-wide" and "stays set"
R2161B-05	Fixed	The comment and the three mockkConstructor calls are gone, and the 12 tests pass. AGP's mockable android.jar keeps constructors, so building the client in a plain JVM test is safe. MIN_SDK is 28 and ServiceWorkerClient is API 24, so building it eagerly is safe on devices too
R2161B-06	Fixed	`#b
R2161B-07	Fixed	The fallback returns the host. The mutant host in place of host.ifEmpty { url } passes all 12 tests: as the author says, only the log line changes
R2161B-08	Fixed	The KDoc, docs and PR body all say "send Google hash prefixes"
R2161B-09	Fixed	The PR body lists 12 tests, and 12 ran
R2161B-10	Fixed	WebRTC is in the KDoc, docs and PR body

Checked and found correct

• :common:testV8DebugUnitTest at 5d2df3a: 217 tests, 0 failures (OffDeviceRequestsTest 12). :idetooltips:testV8DebugUnitTest: 4 tests, 0 failures. Both match the PR body and the response comment.
• Two more fallback mutants from the PR body's list fail as named. A case-sensitive fallback scheme fails an http URL that cannot be read (HTTP://exa mple.com/). Treating every URL that java.net.URI rejects as off-device fails 3 tests.
• spotlessCheck passes at 5d2df3a.
• Edge cases where the URI path or the fallback could read a local host that Chromium would not: ;@, %5c@, #@, IPv6 zone IDs, non-ASCII hosts, out-of-range 127.x octets and 0x7f.1. Each case either agrees with Chromium or fails closed.
• HelpActivity is not exported. Every CONTENT_KEY producer passes a string resource or a tooltip URL, and RunTasksViewModel.navigateToHelp has no callers.
• Toast is still used by the link path in ToolTipManager, so the import is not dead.

Not verified:

• Chromium's removal of interior tabs and line breaks (R2161-10) comes from the URL Standard and was not run in a WebView.
• :app compiling. This review ran no :app task.
• The sponsor button hidden in the debugger overlay. That needs a device.

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[davidschachterADFA]

Response to the review of the fix commits

ID	Status	What changed
R2161-10	Fixed in 7f924e3	Tabs, CRs and LFs anywhere in a URL are dropped before its host is read; three cases added to spaces around a URL do not hide its host
R2161-11	Fixed in 7f924e3	The KDoc and docs/documentation-database.md say a plugin's client lasts only until the next documentation WebView or tooltip popup sets CoGo's again

Checks:

• Node's WHATWG URL parser reads "http\n://evil.com/x", "ht\ttp://evil.com/x" and "https\r\n://evil.com/x" as http(s)://evil.com/x, as the review says the URL Standard has Chromium do. Not run in a WebView. Either way the fix only treats more URLs as off-device, and a canonical URL never holds these characters.
• Removing the new filter fails spaces around a URL do not hide its host.
• :common:testV8DebugUnitTest: 217 tests pass (OffDeviceRequestsTest 12).

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