feat(latest): poll comix through the browser sidecar (#98)

comix.to began answering plain-TLS fetches with a Cloudflare JavaScript
challenge on 2026-08-12, so every poll got a 403 interstitial and its cover
host static.comix.to is gated the same way. comix joins kagane and novelfull
as a browser Site: one registry entry, no plain-TLS fallback, and cover bytes
routed through the browser's image path behind a fully pinned URL pattern.

The read is an in-tab fetch of the Series URL, not a DOM render: comix is an
SPA, so rendering costs ~65 requests for the same server-rendered HTML one
fetch returns (24.5 KB, ~480 ms). Parsers and stored Series identity are
untouched.

Verified live against the real browser unit: page 24793 bytes in one fetch,
chapter 53, cover accepted by the pin and 26862 image bytes retrieved by
direct navigation (comix's Series page sets cross-origin-embedder-policy:
require-corp, so an in-page fetch of the cover host cannot work).

AGENTS.md

@@ -19,9 +19,9 @@ Userscript targets **Violentmonkey**, so `GM_*` APIs available, but stay GM-free
 - Every site is its **own origin with its own `localStorage`** — a shared remote store is the only way to unify bookmarks. Cloud sync required, not optional.
 - Userscript run in **isolated world**, so embedded API token safe from site's JS.
 - Cloudflare's block on manga sites is **per-zone configuration plus request fingerprint, not IP reputation — and not reliably reproducible.** Verified 2026-07-26: plain `curl` from both CGNAT dev machine *and* deployed VPS got clean 200s with real HTML on both asurascans.com and demonicscans.org (homepage, series, chapter pages) — no interactive Turnstile challenge from either IP at test time. Contradicts earlier untested assumption CGNAT dev IP blocked; wasn't, at least this date. Treat "does curl work right now" as live, time-varying fact to re-check, not fixed property of machine — a Site can turn its protection on overnight, which is exactly what comix.to did on 2026-08-12. An earlier version of this line blamed "Cloudflare's bot scoring"; that was wrong. The 1-99 bot score is Enterprise Bot Management only and does not exist for a free-plan zone, and no per-IP request rate is documented as an input to challenge issuance — `docs/research/cloudflare-bot-scoring-and-poll-cadence.md`. Backend fetcher still needs graceful-degrade path for when challenged, and adapters should be **verified against live pages** (Playwright MCP, on-device devtools, direct probe) before finalizing, not assumed from single earlier test.
-- **kagane.to and novelfull.com are the exception to the above** — both sit behind a Cloudflare JavaScript challenge no TLS fingerprint clears, so the backend polls them over CDP (`BROWSER_WS_URL`). When that's unset, kagane is skipped entirely (a plain fetch would only retrieve a challenge page) while novelfull pages are still attempted over plain TLS — its challenge is a live time-varying fact and its cover bytes never need the browser. The four other sites poll fine over plain TLS.
+- **kagane.to, comix.to and novelfull.com are the exception to the above** — all three sit behind a Cloudflare JavaScript challenge no TLS fingerprint clears, so the backend polls them over CDP (`BROWSER_WS_URL`). When that's unset, kagane and comix are skipped entirely (a plain fetch would only retrieve a challenge page) while novelfull pages are still attempted over plain TLS — its challenge is a live time-varying fact and its cover bytes never need the browser. comix turned hostile on 2026-08-12 (#98): its cover host `static.comix.to` is gated too, so its cover bytes go through the browser as well, and its page is read as an in-tab `fetch()` of the series URL rather than a rendered DOM — comix is an SPA, and rendering costs ~65 requests for the same server-rendered HTML one fetch returns. The three other sites poll fine over plain TLS.
 - **The CDP browser must look like a real browser, and stock headless images don't.** Measured 2026-08-08 against kagane.to, all from the same IP: `chromedp/headless-shell:stable` never cleared the challenge in 90s (`navigator.webdriver` true, empty plugin list, Chromium-branded client hints — suppressing `webdriver` alone changed nothing); `zenika/alpine-chrome` ships Chrome 124, refused outright; real Chrome with the default `--headless=new` UA never cleared, because the UA says `HeadlessChrome`; real Chrome with a stock UA **and** a non-UTC clock zone cleared in ~4s. Hence `chrome/` — a Debian image with `google-chrome-stable`, a version-derived UA, and `TZ`/`BROWSER_TZ`. Chrome reads the zone *name* through ICU from `/etc/localtime`'s symlink target, ignoring the file's contents, so mounting the host's `/etc/localtime` does **not** work; `/etc/timezone` is mounted instead.
-- **The browser is not in the API stack and must not be put back.** It's its own compose unit (`chrome/docker-compose.yml`) on a second machine, reached over the tailnet — it held 471 MiB on a 1974 MiB swapless VPS, and a residential egress avoids the cloud-hosting-IP signature Bot Fight Mode documentedly challenges (ADR-0006; not a better "score" — free-plan zones have no score). Consequences that constrain code: `BROWSER_WS_URL` must be a tailnet **IP** (a MagicDNS name 500s at `/json/version`, same trap as the old Docker service name); the CDP port binds to the tailnet address only, since CDP authenticates nothing and that host has a real LAN; and the browser is on-demand (ADR-0005), so an unreachable or asleep one must degrade exactly as an unset `BROWSER_WS_URL` — plain-TLS libraries unaffected, kagane/novelfull logged and skipped, stored covers still served. Never add `chromedp.NoModifyURL`: discovery per fetch is what makes a restarted Chrome invisible.
+- **The browser is not in the API stack and must not be put back.** It's its own compose unit (`chrome/docker-compose.yml`) on a second machine, reached over the tailnet — it held 471 MiB on a 1974 MiB swapless VPS, and a residential egress avoids the cloud-hosting-IP signature Bot Fight Mode documentedly challenges (ADR-0006; not a better "score" — free-plan zones have no score). Consequences that constrain code: `BROWSER_WS_URL` must be a tailnet **IP** (a MagicDNS name 500s at `/json/version`, same trap as the old Docker service name); the CDP port binds to the tailnet address only, since CDP authenticates nothing and that host has a real LAN; and the browser is on-demand (ADR-0005), so an unreachable or asleep one must degrade exactly as an unset `BROWSER_WS_URL` — plain-TLS libraries unaffected, kagane/comix logged and skipped, stored covers still served. Never add `chromedp.NoModifyURL`: discovery per fetch is what makes a restarted Chrome invisible.
 - **UTC is the tell, not a country mismatch.** A UTC clock is the datacenter default, and the challenge refuses it; any real zone clears. Measured 2026-08-08, identical container, one Indonesian egress IP: UTC never cleared in 60s (twice), while `Asia/Jakarta` **and** `America/New_York` both cleared in 4s. An earlier note here claimed the zone had to match the egress IP's country — that was wrong, inferred from the host clock (`Asia/Bangkok`) rather than the measured egress. A second earlier claim, that Cloudflare "scores" a UTC clock, was also wrong: the measurement is real but the mechanism is not documented anywhere — Cloudflare publishes no timezone signal, and free-plan zones carry no score at all. `BROWSER_TZ` therefore needs a plausible zone, not a geolocated one.
 - **A challenged page needs the tab kept open.** The interstitial takes seconds to solve and only then writes clearance into the browser's shared cookie jar. Navigate-read-close never clears anything; `BrowserFetcher.run` holds one tab and re-reads until the payload arrives.
 
@@ -45,12 +45,16 @@ Backend (`cd backend`):
 - Single test: `go test -run TestName ./...`
 - Build static binary: `CGO_ENABLED=0 go build`
 
-Local stack: `docker compose up` (bookmark-api + postgres only; `postgres-data` named volume, `restart: unless-stopped`). No browser — without `BROWSER_WS_URL` the poller logs and skips kagane and novelfull. To run one: `cd chrome && BROWSER_BIND_ADDR=172.17.0.1 docker compose up -d --build`, then `BROWSER_WS_URL=ws://172.17.0.1:9222` in the root `.env` (bridge gateway, so the API container can name it by IP).
+Local stack: `docker compose up` (bookmark-api + postgres only; `postgres-data` named volume, `restart: unless-stopped`). No browser — without `BROWSER_WS_URL` the poller logs and skips kagane and comix. To run one: `cd chrome && BROWSER_BIND_ADDR=172.17.0.1 docker compose up -d --build`, then `BROWSER_WS_URL=ws://172.17.0.1:9222` in the root `.env` (bridge gateway, so the API container can name it by IP).
 
 Live CDP proof (needs that browser and network, skipped otherwise):
-`SMOKE_BROWSER_WS_URL=ws://<ip>:<port> go test -run TestSmokeKagane ./internal/latest`
-— fetches a real kagane cover and chapter list. A red run means the challenge is
+`SMOKE_BROWSER_WS_URL=ws://<ip>:<port> go test -run 'TestSmokeKagane|TestSmokeComix' ./internal/latest`
+— fetches a real kagane and comix cover and chapter list. A red run means the challenge is
 not clearing from this IP, which is a live fact to re-check, not necessarily a defect.
+Note for this dev machine: comix.to is DNS-hijacked to an ISP block page here
+(`comix.to` CNAMEs to `aduankonten.id`, so Chrome fails `ERR_CERT_COMMON_NAME_INVALID`).
+Run the browser container with `--add-host comix.to:<cloudflare-ip> --add-host static.comix.to:<same>`
+resolved over DoH to get a real reading.
 
 Smoke test: `curl` endpoints with `Authorization: Bearer <token>`; confirm `OPTIONS` preflight return CORS headers and `/healthz` return 200.
 

REDEPLOY.md

@@ -436,8 +436,8 @@ free -m                     # the Gitea runner should still have its headroom
 
 Nothing here needs doing during an API redeploy. The API stack does not
 `depends_on` the browser, and an unreachable one degrades exactly as an unset
-`BROWSER_WS_URL`: plain-TLS libraries unaffected, kagane and novelfull logged
-and skipped, stored covers still served.
+`BROWSER_WS_URL`: plain-TLS libraries unaffected, kagane and comix logged
+and skipped, novelfull attempted over plain TLS, stored covers still served.
 
 ---
 

backend/AGENTS.md

@@ -89,12 +89,15 @@ Guidance for OpenCode (and Claude Code) working under `backend/`. See root `AGEN
   `Store.SetLatestChapter`, so a bookmark's `updated_at` — and the list
   order — is never touched.
   Fetches use `bogdanfinn/tls-client` with Chrome profile as defence in depth
-  against fingerprint-based blocking; any failure log and skip. kagane and
-  novelfull sit behind Cloudflare JavaScript challenges the TLS client can't
-  clear, so they are fetched over CDP via `BROWSER_WS_URL`; kagane is simply
-  not polled when that's unset, while novelfull falls back to a plain-TLS
-  attempt — its challenge is a live time-varying fact, and its cover bytes
-  never need the browser. See
+  against fingerprint-based blocking; any failure log and skip. kagane, comix
+  and novelfull sit behind Cloudflare JavaScript challenges the TLS client
+  can't clear, so they are fetched over CDP via `BROWSER_WS_URL`; kagane and
+  comix are simply not polled when that's unset, while novelfull falls back to
+  a plain-TLS attempt — its challenge is a live time-varying fact, and its
+  cover bytes never need the browser. comix's browser read is an in-tab
+  `fetch()` of the Series URL, not a DOM render: it is an SPA, so rendering
+  costs ~65 requests for the same server-rendered HTML one fetch returns
+  (measured 2026-08-12, issue #98). See
   `docs/superpowers/specs/2026-07-26-server-latest-chapter-polling-design.md`.
   The poller's series write is a single-column UPDATE
   (`Store.SetLatestChapter`), not a read-modify-write of the whole bookmark:
@@ -112,14 +115,17 @@ Guidance for OpenCode (and Claude Code) working under `backend/`. See root `AGEN
   is public and uncredentialed: the userscript renders it on a Site's origin,
   where no cookie or token of ours travels. A client-sent `cover` is decoded
   and discarded, permanently (ADR-0004 compatibility).
-  Browser-backed Sites join the same pipeline (issue #62): kagane pages *and*
-  cover bytes go through the browser sidecar (nothing falls back to a plain
-  fetch, which would only retrieve a challenge page), while novelfull needs
-  the browser only for its HTML — the cover URL comes out of the
-  browser-fetched page and the bytes go over plain TLS. With no browser
-  configured, kagane Covers are simply absent; novelfull still gets one — at
-  creation and on the poll — when its page body happens to answer a plain
-  request (the challenge is a live time-varying fact). The old kagane-only
+  Browser-backed Sites join the same pipeline (issue #62, extended to comix by
+  #98): kagane and comix pages *and* cover bytes go through the browser sidecar
+  (nothing falls back to a plain fetch, which would only retrieve a challenge
+  page), while novelfull needs the browser only for its HTML — the cover URL
+  comes out of the browser-fetched page and the bytes go over plain TLS. With
+  no browser configured, kagane and comix Covers are simply absent; novelfull
+  still gets one — at creation and on the poll — when its page body happens to
+  answer a plain request (the challenge is a live time-varying fact). comix
+  cover bytes must arrive by direct navigation, not an in-page fetch: its
+  Series page sets `cross-origin-embedder-policy: require-corp`, which fails a
+  page-context fetch of `static.comix.to`. The old kagane-only
   serving path (`/img/kagane/{id}`, template rewrite, `CoverFetcher`) is gone
   (issue #63): the one public route serves every Site.
 - **`updated_at` drives list order, so moves only on real reading progress:** server apply its timestamp when row new or `last_chapter_num` changes, else keep stored value — favouriting series or recording newly published chapter must not reorder list. `PUT` therefore returns row **as stored**, clients must adopt that response rather than own payload. See `plans/2026-07-25-bookmark-list-favorites-design.md` §4.
@@ -164,10 +170,11 @@ Guidance for OpenCode (and Claude Code) working under `backend/`. See root `AGEN
   Reader's credential at serve time).
   `BROWSER_WS_URL` (CDP endpoint of the browser, which runs on a **separate
   machine** and is reached over the tailnet — ADR-0006, `chrome/docker-compose.yml`.
-  Used by the poller for kagane and novelfull page fetches and by the cover
-  pipeline for kagane's image bytes (the browser is the only route that clears
-  the challenge kagane serves its covers behind); unset — the default —
-  disables browser polling and leaves kagane Covers blank until stored bytes
+  Used by the poller for kagane, comix and novelfull page fetches and by the
+  cover pipeline for kagane's and comix's image bytes (the browser is the only
+  route that clears the challenge those two serve their covers behind); unset —
+  the default — disables browser polling and leaves kagane and comix Covers
+  blank until stored bytes
   exist. Must be a tailnet IP, never a hostname: Chrome's DevTools handler 500s
   `/json/version` for any Host that isn't an IP or `localhost`).
 - **No per-Site cover path (issue #63):** every Cover — all six Sites — is
@@ -175,8 +182,10 @@ Guidance for OpenCode (and Claude Code) working under `backend/`. See root `AGEN
   bytes. There is no proxy, no per-Site rewrite, no second place that decides
   a Cover's renderable address: the wire `cover` is it. The only place a Site
   name still appears in cover code is the extraction module (`latest`), where
-  kagane's image URLs are claimed by `browserOnlyCoverURL` — they answer a
-  plain fetch with a challenge and `cross-origin-resource-policy: same-origin`;
+  kagane's and comix's image URLs are claimed by `browserOnlyCoverURL` — kagane
+  answers a plain fetch with a challenge and
+  `cross-origin-resource-policy: same-origin`, and `static.comix.to` answers
+  one with the same Cloudflare challenge its pages serve;
   every other Site's CDN answers plain TLS. Templates render `.Cover` — the
   wire value — never anything else.
 - **Web UI also owns:** session-gated `GET /install/{manga,novel}-bookmark.user.js`

backend/internal/latest/browser.go

@@ -24,12 +24,16 @@ const challengeTimeout = 45 * time.Second
 
 var kaganeSeriesRe = regexp.MustCompile(`^/series/([0-9a-f-]{36})/?$`)
 
+// comixSeriesPathRe matches the one path shape comixRead will open: a Series
+// page, "/title/<id>-<slug>". Verified live 2026-08-12.
+var comixSeriesPathRe = regexp.MustCompile(`^/title/[^/?#]+/?$`)
+
 // BrowserFetcher retrieves pages through a remote headless Chrome over the
 // DevTools Protocol.
 //
-// It exists for one reason: kagane.to and novelfull.com sit behind a
-// Cloudflare JavaScript challenge. Verified 2026-08-03 (kagane) and 2026-08-05
-// (novelfull) from the deployment host, plain HTTP and bogdanfinn/tls-client
+// It exists for one reason: kagane.to, novelfull.com and comix.to sit behind a
+// Cloudflare JavaScript challenge. Verified 2026-08-03 (kagane), 2026-08-05
+// (novelfull) and 2026-08-12 (comix), plain HTTP and bogdanfinn/tls-client
 // with a Chrome_133 profile both get 403 with cf-mitigated: challenge on every
 // path, including the API, robots.txt and images. Clearing it requires
 // executing the challenge script, which only a real browser does.
@@ -141,29 +145,47 @@ func novelfullRead(seriesURL string, out *string) (chromedp.Action, bool) {
 	return chromedp.OuterHTML("html", out, chromedp.ByQuery), true
 }
 
+// comixRead fetches the Series page from inside the cleared tab. comix is an
+// SPA: rendering the page costs ~65 requests, while one same-origin fetch of
+// the same address returns the server-rendered HTML — 24.5 KB, ~480 ms,
+// carrying both parser anchors (measured 2026-08-12, issue #98). So this is
+// kaganeRead's shape, not novelfullRead's, even though the payload is HTML.
+// Refusing any other address is the per-Site half of the SSRF gate.
+func comixRead(seriesURL string, out *string) (chromedp.Action, bool) {
+	pageURL, ok := comixSeriesPageURL(seriesURL)
+	if !ok {
+		return nil, false
+	}
+	return chromedp.Evaluate(
+		`fetch(`+jsString(pageURL)+`).then(r => r.ok ? r.text() : "")`,
+		out, awaitPromise), true
+}
+
 // Image retrieves one cover's bytes through the browser sidecar, and its
 // content type.
 //
-// It exists because kagane serves covers behind the same challenge as its
-// pages *and* with `cross-origin-resource-policy: same-origin`, so the bytes
-// are only reachable from inside a browser that already holds the clearance
-// cookie (verified 2026-08-08). Acquisition through the sidecar is the only
-// route.
+// It exists because kagane and comix serve covers behind the same challenge as
+// their pages — kagane additionally with
+// `cross-origin-resource-policy: same-origin` — so the bytes are only
+// reachable from inside a browser that already holds the clearance cookie
+// (verified 2026-08-08 for kagane, 2026-08-12 for comix). Acquisition through
+// the sidecar is the only route.
 //
-// The image URL is navigated to rather than fetched from some other kagane
-// page: the challenge only runs on a top-level navigation, and once it clears
+// The image URL is navigated to rather than fetched from another page of the
+// Site: the challenge only runs on a top-level navigation, and once it clears
 // the document *is* the image, so a same-origin fetch of location.href reads
-// it straight back out of the cache.
+// it straight back out of the cache. For comix the navigation is also the only
+// route that works at all — its Series page sets
+// `cross-origin-embedder-policy: require-corp`, which fails a page-context
+// fetch of the cover host.
 //
 // The challenge is not solved by the first read: WaitReady("body") is satisfied
 // by the interstitial too. run holds the tab open until the in-page fetch
 // succeeds, which is what gives the challenge script the seconds it needs.
 func (f *BrowserFetcher) Image(ctx context.Context, imageURL string) ([]byte, string, error) {
-	m := kaganeImageURLRe.FindStringSubmatch(imageURL)
-	if m == nil {
+	if !browserOnlyCoverURL(imageURL) {
 		return nil, "", fmt.Errorf("not a browser-fetchable cover url: %q", imageURL)
 	}
-	imageID := m[1]
 	var dataURL string
 	err := f.run(ctx, imageURL,
 		chromedp.Evaluate(`fetch(location.href).then(r => r.ok
@@ -175,16 +197,16 @@ func (f *BrowserFetcher) Image(ctx context.Context, imageURL string) ([]byte, st
 			: "")`, &dataURL, awaitPromise),
 		func() bool { return dataURL != "" })
 	if err != nil {
-		return nil, "", fmt.Errorf("browser image %s: %w", imageID, err)
+		return nil, "", fmt.Errorf("browser image %s: %w", imageURL, err)
 	}
 	// "data:image/webp;base64,<payload>".
 	head, payload, ok := strings.Cut(dataURL, ";base64,")
 	if !ok {
-		return nil, "", fmt.Errorf("browser image %s: not a data url", imageID)
+		return nil, "", fmt.Errorf("browser image %s: not a data url", imageURL)
 	}
 	raw, err := base64.StdEncoding.DecodeString(payload)
 	if err != nil {
-		return nil, "", fmt.Errorf("browser image %s: %w", imageID, err)
+		return nil, "", fmt.Errorf("browser image %s: %w", imageURL, err)
 	}
 	return raw, strings.TrimPrefix(head, "data:"), nil
 }
@@ -323,6 +345,19 @@ func novelfullSeriesURL(seriesURL string) bool {
 		strings.HasSuffix(u.Path, ".html")
 }
 
+// comixSeriesPageURL returns the address comixRead fetches inside the tab: the
+// Series page itself, rebuilt from the pinned host and path so nothing else
+// travels. Host-pinned here for the same reason kagane's is — series_url is
+// client-supplied and a headless browser is a strong SSRF primitive.
+func comixSeriesPageURL(seriesURL string) (string, bool) {
+	u, err := url.Parse(seriesURL)
+	if err != nil || u.Scheme != "https" || u.Hostname() != "comix.to" ||
+		!comixSeriesPathRe.MatchString(u.Path) {
+		return "", false
+	}
+	return "https://comix.to" + u.Path, true
+}
+
 // awaitPromise makes Evaluate resolve the promise rather than returning a
 // serialised Promise object.
 func awaitPromise(p *runtime.EvaluateParams) *runtime.EvaluateParams {

backend/internal/latest/browser_test.go

@@ -61,6 +61,62 @@ func TestNovelfullSeriesURL(t *testing.T) {
 		})
 	}
 }
+
+func TestComixSeriesPageURL(t *testing.T) {
+	const series = "https://comix.to/title/n8we-dungeons-and-crayons"
+	cases := []struct {
+		name string
+		url  string
+		want string
+	}{
+		{"series page", series, series},
+		{"trailing slash kept", series + "/", series + "/"},
+		// Query and fragment are dropped: only the pinned path travels.
+		{"query dropped", series + "?tab=chapters", series},
+		{"foreign host", "https://evil.example/title/x", ""},
+		{"lookalike host", "https://comix.to.evil.example/title/x", ""},
+		{"not https", "http://comix.to/title/x", ""},
+		{"not a series path", "https://comix.to/search", ""},
+		{"chapter page", series + "/11139891-chapter-80", ""},
+		{"garbage", "://nope", ""},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			got, ok := comixSeriesPageURL(tc.url)
+			if ok != (tc.want != "") || got != tc.want {
+				t.Fatalf("comixSeriesPageURL(%q) = %q, %v; want %q", tc.url, got, ok, tc.want)
+			}
+		})
+	}
+}
+
+// The browser is an SSRF primitive and a cover address can originate in a
+// client-supplied PUT body, so this gate decides what it may navigate to.
+func TestBrowserOnlyCoverURL(t *testing.T) {
+	cases := []struct {
+		url  string
+		want bool
+	}{
+		{"https://static.comix.to/039d/i/1/34/6a6742bf15736@280.jpg", true},
+		{"https://kagane.to/api/v2/image/019fe11a-84c3-7fc3-a84b-88787374b617/compressed", true},
+		// Every other Site's CDN answers plain TLS.
+		{"https://gg.asuracomic.net/covers/x.webp", false},
+		{"http://static.comix.to/039d/x.jpg", false},
+		{"https://static.comix.to.evil.example/039d/x.jpg", false},
+		{"https://evil.example/static.comix.to/x.jpg", false},
+		{"https://static.comix.to/039d/x.jpg?next=http://169.254.169.254/", false},
+		{"https://static.comix.to/039d/x.svg", false},
+		{"https://static.comix.to/../etc/passwd.jpg", false},
+		{"https://static.comix.to/", false},
+	}
+	for _, tc := range cases {
+		t.Run(tc.url, func(t *testing.T) {
+			if got := browserOnlyCoverURL(tc.url); got != tc.want {
+				t.Fatalf("browserOnlyCoverURL(%q) = %v, want %v", tc.url, got, tc.want)
+			}
+		})
+	}
+}
 func TestClassifyBrowserInterruption(t *testing.T) {
 	if err := classifyBrowserError(context.Background(), true, context.Canceled); !errors.Is(err, errBrowserInterrupted) {
 		t.Fatalf("classifyBrowserError(context.Canceled) = %v, want browser interruption", err)

backend/internal/latest/cover.go

@@ -25,7 +25,8 @@ type CoverBytesFetcher interface {
 // fetchCoverBytes routes a cover's byte retrieval by URL shape, not by Site
 // name: the browser fetcher's module claims the addresses only it can fetch
 // (kagane's image route answers a plain fetch with a challenge and
-// `cross-origin-resource-policy: same-origin`), and everything else goes over
+// `cross-origin-resource-policy: same-origin`, static.comix.to answers one with
+// the same challenge its pages serve), and everything else goes over
 // plain TLS. Missing fetchers degrade to an error the caller logs, never a
 // fallback onto a path that cannot succeed. One routing rule for the poll and
 // the acquirer, so the two cannot drift apart.

backend/internal/latest/poller.go

@@ -17,8 +17,8 @@ type Fetcher interface {
 }
 
 // BrowserCoverFetcher retrieves one cover's bytes through the browser-backed
-// path — the only route that clears the challenge kagane's image URLs answer
-// a plain fetch with. Satisfied by BrowserFetcher.
+// path — the only route that clears the challenge kagane's and comix's image
+// URLs answer a plain fetch with. Satisfied by BrowserFetcher.
 type BrowserCoverFetcher interface {
 	Image(ctx context.Context, imageURL string) (body []byte, contentType string, err error)
 }
@@ -119,9 +119,9 @@ func (p *Poller) storeCover(ctx context.Context, sr store.Series, sourceURL stri
 
 // fetcherFor returns the fetcher a site's page needs, or nil when the site
 // cannot be fetched at all right now. A Site whose registry entry carries a
-// Browser read — kagane and novelfull, both behind a Cloudflare JavaScript
-// challenge no TLS fingerprint clears — prefers the browser; when it is
-// absent, the entry's Fallback decides whether plain TLS may take over. One
+// Browser read — kagane, comix and novelfull, all behind a Cloudflare
+// JavaScript challenge no TLS fingerprint clears — prefers the browser; when it
+// is absent, the entry's Fallback decides whether plain TLS may take over. One
 // routing rule for the poll and the acquirer, so the two cannot drift apart.
 func fetcherFor(site string, browser, tls Fetcher) Fetcher {
 	s, known := sites[site]

backend/internal/latest/poller_test.go

@@ -762,6 +762,86 @@ func TestKaganeUsesBrowserFetcher(t *testing.T) {
 	}
 }
 
+// comix joined kagane behind the challenge on 2026-08-12 (#98): its page goes
+// to the browser, its Cover bytes go through the browser's image route because
+// static.comix.to is gated the same way, and the TLS fetcher is never asked
+// for either.
+func TestComixUsesBrowserFetcher(t *testing.T) {
+	s, dbURL := newTestStore(t)
+	const (
+		key       = "comix:n8we-dungeons-and-crayons"
+		seriesID  = "n8we-dungeons-and-crayons"
+		seriesURL = "https://comix.to/title/n8we-dungeons-and-crayons"
+		coverURL  = "https://static.comix.to/039d/i/1/34/6a6742bf15736@280.jpg"
+	)
+	if _, err := s.Upsert(s.OwnerID(), store.Bookmark{
+		Key: key, Site: "comix", SeriesID: seriesID, SeriesURL: seriesURL,
+		UpdatedAt: 1000,
+	}); err != nil {
+		t.Fatalf("seed: %v", err)
+	}
+	seedCoverSource(t, dbURL, "comix", seriesID, coverURL)
+
+	tlsF := &fakeFetcher{body: "", status: 200}
+	browserF := &fakeFetcher{body: comixSeriesFixture, status: 200}
+	covers := &fakeCoverFetcher{body: []byte("cover-bytes"), contentType: "image/jpeg"}
+	tlsCovers := &fakeBytesCoverFetcher{body: []byte("tls-bytes"), contentType: "image/jpeg"}
+	p := &Poller{
+		Store: s, Fetch: tlsF, BrowserFetch: browserF,
+		CoverFetch: covers, CoverBytesFetch: tlsCovers,
+		Now:      func() time.Time { return time.UnixMilli(5_000_000) },
+		Cooldown: time.Hour, BrowserCooldown: time.Hour,
+		Interval: time.Hour, Batch: 10,
+	}
+	p.runOnce(context.Background())
+
+	if len(tlsF.calls) != 0 {
+		t.Errorf("TLS fetcher was called for comix: %v", tlsF.calls)
+	}
+	if len(browserF.calls) != 1 {
+		t.Fatalf("browser fetcher calls = %v, want 1", browserF.calls)
+	}
+	if got := tlsCovers.callCount(); got != 0 {
+		t.Errorf("TLS cover fetches = %d, want 0: static.comix.to answers a challenge", got)
+	}
+	if got := covers.callCount(); got != 1 {
+		t.Fatalf("browser cover fetches = %d, want 1", got)
+	}
+	got, found, err := s.Get(s.OwnerID(), key)
+	if err != nil || !found {
+		t.Fatalf("Get: %v found=%v", err, found)
+	}
+	if got.LatestChapterNum == nil || *got.LatestChapterNum != 80 {
+		t.Errorf("LatestChapterNum = %v, want 80", got.LatestChapterNum)
+	}
+}
+
+// Without a browser, comix is skipped outright rather than handed to plain
+// TLS: a plain fetch retrieves only a challenge page (measured 2026-08-12).
+func TestComixSkippedWhenNoBrowserFetcher(t *testing.T) {
+	s, _ := newTestStore(t)
+	if _, err := s.Upsert(s.OwnerID(), store.Bookmark{
+		Key: "comix:n8we-dungeons-and-crayons", Site: "comix",
+		SeriesID:  "n8we-dungeons-and-crayons",
+		SeriesURL: "https://comix.to/title/n8we-dungeons-and-crayons",
+		UpdatedAt: 1000,
+	}); err != nil {
+		t.Fatalf("seed: %v", err)
+	}
+	f := &fakeFetcher{body: comixSeriesFixture, status: 200}
+	p := &Poller{
+		Store: s, Fetch: f,
+		Now:      func() time.Time { return time.UnixMilli(5_000_000) },
+		Cooldown: time.Hour, BrowserCooldown: time.Hour,
+		Interval: time.Hour, Batch: 10,
+	}
+	p.runOnce(context.Background())
+
+	if len(f.calls) != 0 {
+		t.Errorf("TLS fetcher was called for comix: %v", f.calls)
+	}
+}
+
 func TestRunOncePrefetchesKaganeCover(t *testing.T) {
 	s, dbURL := newTestStore(t)
 	const (

backend/internal/latest/sites.go

@@ -248,14 +248,25 @@ var comixInitialDataRe = regexp.MustCompile(`(?is)<script\b[^>]*\bid\s*=\s*["']i
 // supplied, and a headless browser is a strong SSRF primitive.
 var kaganeImageURLRe = regexp.MustCompile(`^https://kagane\.to/api/v2/image/([0-9a-f-]{36})/compressed$`)
 
+// comixImageURLRe matches comix's cover host and path shape. Pinned in full
+// (scheme, host, path characters, image extension) for the same reason
+// kaganeImageURLRe is: the address reaches a headless browser, and it can
+// originate in a client-supplied PUT body. No dot is allowed inside the path,
+// so no traversal or second extension can hide in it. Shape from a live page,
+// 2026-08-10: /039d/i/1/34/6a6742bf15736@280.jpg.
+var comixImageURLRe = regexp.MustCompile(`^https://static\.comix\.to/[A-Za-z0-9@/_-]+\.(?:jpg|jpeg|png|webp)$`)
+
 // browserOnlyCoverURL reports whether the browser sidecar is the only fetcher
 // for cover bytes at imageURL. kagane's image route answers a plain fetch with
-// a challenge and `cross-origin-resource-policy: same-origin`, so a TLS fetch
-// would only ever retrieve a challenge page and must not be attempted
-// (ADR-0007). This is the byte-fetch router's per-Site knowledge; it lives in
-// the extraction module, which owns kagane's URL shapes.
+// a challenge and `cross-origin-resource-policy: same-origin`, and
+// static.comix.to answers one with the same Cloudflare challenge its pages
+// serve (measured 2026-08-12, issue #98), so a TLS fetch would only ever
+// retrieve a challenge page and must not be attempted (ADR-0007). This is the
+// byte-fetch router's per-Site knowledge; it lives in the extraction module,
+// which owns those URL shapes.
 func browserOnlyCoverURL(imageURL string) bool {
-	return kaganeImageURLRe.MatchString(imageURL)
+	return kaganeImageURLRe.MatchString(imageURL) ||
+		comixImageURLRe.MatchString(imageURL)
 }
 
 // kagane's browser-fetched series response publishes cover image IDs under
@@ -389,6 +400,15 @@ var sites = map[string]site{
 		Host:          "comix.to",
 		LatestChapter: comixLatestChapter,
 		Cover:         comixCoverEntry,
+		Browser: &browserRead{
+			Read: comixRead,
+			// The interstitial is served in place of the page, so "arrived"
+			// has to exclude it explicitly, as novelfull's does.
+			Done: func(body string) bool { return body != "" && !isInterstitial(body) },
+			// Never falls back: a plain fetch of a comix page or cover
+			// retrieves only a challenge page (measured 2026-08-12).
+			Fallback: false,
+		},
 	},
 	"kagane": {
 		Host:          "kagane.to",

backend/internal/latest/sites_test.go

@@ -41,6 +41,10 @@ const challengeFixture = `<!DOCTYPE html><html><head><title>Just a moment...</ti
 // https://comix.to/title/n8we-dungeons-and-crayons fetched 2026-08-03. comix is
 // an SPA: the page ships a JSON state blob rather than a list of chapter
 // anchors, and latestChapterUrl is where the newest chapter actually lives.
+//
+// Still the right fixture after comix moved behind the challenge (#98): the
+// browser read is an in-tab fetch of the Series URL, so the body a poll parses
+// is this same server-rendered HTML, not a rendered DOM.
 const comixSeriesFixture = `
 {"firstChapterUrl":"/title/n8we-dungeons-and-crayons/5038739-chapter-1","latestChapterUrl":"/title/n8we-dungeons-and-crayons/11139891-chapter-80"},
 {""manga","recommended","n8we",1]":{"items":[{"latestChapterUrl":"/title/qqwrm-full-time-awakening/99999999-chapter-999"}]}

backend/internal/latest/smoke_comix_test.go

@@ -0,0 +1,72 @@
+package latest
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"bookmarkmanager/backend/internal/store"
+)
+
+// TestSmokeComix answers "is comix's challenge clearing from this browser right
+// now" — a live, time-varying fact, so a red run is something to re-check
+// before it is a defect. Needs the real browser unit with outbound network:
+//
+//	cd chrome && BROWSER_BIND_ADDR=127.0.0.1 docker compose up -d --build
+//	SMOKE_BROWSER_WS_URL=ws://127.0.0.1:9222 go test -run TestSmokeComix ./internal/latest
+//
+// It walks the whole read: the in-tab page fetch, both parses, and the Cover
+// bytes by direct navigation to static.comix.to. The Cover address comes out of
+// the page rather than being pinned in the test, because a stored one rots.
+func TestSmokeComix(t *testing.T) {
+	ws := os.Getenv("SMOKE_BROWSER_WS_URL")
+	if ws == "" {
+		t.Skip("SMOKE_BROWSER_WS_URL unset")
+	}
+	const seriesURL = "https://comix.to/title/m12d-classmate"
+
+	f, err := NewBrowserFetcher(ws)
+	if err != nil {
+		t.Fatalf("NewBrowserFetcher: %v", err)
+	}
+	defer f.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
+	defer cancel()
+
+	body, status, err := f.Get(ctx, seriesURL)
+	if err != nil {
+		t.Fatalf("Get: %v", err)
+	}
+	t.Logf("status=%d bytes=%d", status, len(body))
+	if status != 200 {
+		t.Fatalf("status = %d, want 200 — the sidecar is not clearing the challenge", status)
+	}
+	chapter, ok := latestChapterFrom("comix", seriesURL, body)
+	if !ok {
+		t.Fatalf("no latest chapter in %d bytes — page shape changed", len(body))
+	}
+	t.Logf("latest chapter: %v %q", chapter.Num, chapter.Label)
+
+	cover, ok := coverFrom("comix", seriesURL, body)
+	if !ok {
+		t.Fatalf("no cover address in %d bytes — page shape changed", len(body))
+	}
+	t.Logf("cover: %s", cover)
+	if !browserOnlyCoverURL(cover) {
+		t.Fatalf("cover %q is not claimed by the browser gate: the pin and the live URL shape disagree", cover)
+	}
+
+	bytes, contentType, err := f.Image(ctx, cover)
+	if err != nil {
+		t.Fatalf("Image: %v", err)
+	}
+	if len(bytes) < 1000 {
+		t.Fatalf("cover is %d bytes, want a real image", len(bytes))
+	}
+	t.Logf("fetched %d bytes of %s", len(bytes), contentType)
+	if _, ok := store.CoverContentType(contentType); !ok {
+		t.Fatalf("content type %q is not storable", contentType)
+	}
+}