fix(core+server): guard markdown pipe slice + detect trustpilot/reddit verify walls

- New BrowserProfile::SafariIos mapped to BrowserVariant::SafariIos26.
  Built on wreq_util::Emulation::SafariIos26 with 4 overrides (TLS
  extension order, HTTP/2 HEADERS priority, real Safari iOS 26 headers,
  gzip/deflate/br). Matches bogdanfinn safari_ios_26_0 JA3
  8d909525bd5bbb79f133d11cc05159fe exactly. Empirically 9/10 on
  immobiliare.it with country-it residential.

- BrowserProfile::Chrome aligned to bogdanfinn chrome_133: dropped
  MAX_CONCURRENT_STREAMS from H2 SETTINGS, priority weight 256,
  explicit extension_permutation, advertise h3 in ALPN and ALPS.
  JA3 43067709b025da334de1279a120f8e14, akamai_fp
  52d84b11737d980aef856699f885ca86. Fixes indeed.com and other
  Cloudflare-fronted sites.

- New locale module: accept_language_for_url / accept_language_for_tld.
  TLD to Accept-Language mapping, unknown TLDs default to en-US.
  DataDome geo-vs-locale cross-checks are now trivially satisfiable.

- wreq-util bumped 2.2.6 to 3.0.0-rc.10 for Emulation::SafariIos26.

CHANGELOG.md

@@ -3,6 +3,36 @@
 All notable changes to webclaw are documented here.
 Format follows [Keep a Changelog](https://keepachangelog.com/).
 
+## [0.5.6] — 2026-04-23
+
+### Added
+- `FetchClient::fetch_smart(url)` applies per-site rescue logic and returns the same `FetchResult` shape as `fetch()`. Reddit URLs route to the `.json` API with an identifiable bot `User-Agent`, and Akamai-style challenge pages trigger a homepage cookie warmup plus a retry. Makes `/v1/scrape` on Reddit populate markdown again.
+
+### Fixed
+- Regression introduced in 0.5.4 where the production server's `/v1/scrape` bypassed the Reddit `.json` shortcut and Akamai cookie warmup that `fetch_and_extract` had been providing. Both helpers now live in `fetch_smart` and every caller path picks them up.
+- Panic in the markdown converter (`markdown.rs:925`) on single-pipe `|` lines. A `[1..len-1]` slice on a 1-char input triggered `begin <= end`. Guarded.
+
+---
+
+## [0.5.5] — 2026-04-23
+
+### Added
+- `webclaw --browser safari-ios` on the CLI. Pairs with `--proxy` for DataDome-fronted sites that reject desktop profiles.
+
+---
+
+## [0.5.4] — 2026-04-23
+
+### Added
+- New `BrowserProfile::SafariIos` for Safari iOS 26 fingerprinting. Pairs with a country-matched residential proxy for sites that reject non-mobile profiles.
+- `accept_language_for_url(url)` and `accept_language_for_tld(tld)` helpers. Returns a locale-appropriate `Accept-Language` based on the URL's TLD, with `en-US` as the fallback.
+
+### Changed
+- Chrome browser fingerprint refreshed for current Cloudflare bot management. Fixes 403 challenges on several e-commerce and jobs sites.
+- Bumped `wreq-util` to `3.0.0-rc.10`.
+
+---
+
 ## [0.5.2] — 2026-04-22
 
 ### Added

CLAUDE.md

@@ -79,7 +79,7 @@ Three binaries: `webclaw` (CLI), `webclaw-mcp` (MCP server), `webclaw-server` (R
 - **webclaw-fetch uses wreq 6.x** (BoringSSL). No `[patch.crates-io]` forks needed; wreq handles TLS internally.
 - **No special RUSTFLAGS** — `.cargo/config.toml` is currently empty of build flags. Don't add any.
 - **webclaw-llm uses plain reqwest**. LLM APIs don't need TLS fingerprinting, so no wreq dep.
-- **Vertical extractors take `&dyn Fetcher`**, not `&FetchClient`. This lets the production server plug in a `TlsSidecarFetcher` that routes through the Go tls-sidecar instead of in-process wreq.
+- **Vertical extractors take `&dyn Fetcher`**, not `&FetchClient`. This lets the production server plug in a `ProductionFetcher` that adds domain_hints routing and antibot escalation on top of the same wreq client.
 - **qwen3 thinking tags** (`<think>`) are stripped at both provider and consumer levels.
 
 ## Build & Test

Cargo.lock

@@ -2967,6 +2967,26 @@ dependencies = [
  "pom",
 ]
 
+[[package]]
+name = "typed-builder"
+version = "0.23.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31aa81521b70f94402501d848ccc0ecaa8f93c8eb6999eb9747e72287757ffda"
+dependencies = [
+ "typed-builder-macro",
+]
+
+[[package]]
+name = "typed-builder-macro"
+version = "0.23.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "076a02dc54dd46795c2e9c8282ed40bcfb1e22747e955de9389a1de28190fb26"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "typed-path"
 version = "0.12.3"
@@ -3199,7 +3219,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-cli"
-version = "0.5.2"
+version = "0.5.6"
 dependencies = [
  "clap",
  "dotenvy",
@@ -3220,7 +3240,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-core"
-version = "0.5.2"
+version = "0.5.6"
 dependencies = [
  "ego-tree",
  "once_cell",
@@ -3238,7 +3258,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-fetch"
-version = "0.5.2"
+version = "0.5.6"
 dependencies = [
  "async-trait",
  "bytes",
@@ -3258,12 +3278,13 @@ dependencies = [
  "webclaw-core",
  "webclaw-pdf",
  "wreq",
+ "wreq-util",
  "zip 2.4.2",
 ]
 
 [[package]]
 name = "webclaw-llm"
-version = "0.5.2"
+version = "0.5.6"
 dependencies = [
  "async-trait",
  "reqwest",
@@ -3276,7 +3297,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-mcp"
-version = "0.5.2"
+version = "0.5.6"
 dependencies = [
  "dirs",
  "dotenvy",
@@ -3296,7 +3317,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-pdf"
-version = "0.5.2"
+version = "0.5.6"
 dependencies = [
  "pdf-extract",
  "thiserror",
@@ -3305,7 +3326,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-server"
-version = "0.5.2"
+version = "0.5.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -3709,6 +3730,16 @@ dependencies = [
  "zstd",
 ]
 
+[[package]]
+name = "wreq-util"
+version = "3.0.0-rc.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c6bbe24d28beb9ceb58b514bd6a613c759d3b706f768b9d2950d5d35b543c04"
+dependencies = [
+ "typed-builder",
+ "wreq",
+]
+
 [[package]]
 name = "writeable"
 version = "0.6.2"

Cargo.toml

@@ -3,7 +3,7 @@ resolver = "2"
 members = ["crates/*"]
 
 [workspace.package]
-version = "0.5.2"
+version = "0.5.6"
 edition = "2024"
 license = "AGPL-3.0"
 repository = "https://github.com/0xMassi/webclaw"

crates/webclaw-cli/src/main.rs

@@ -351,6 +351,9 @@ enum OutputFormat {
 enum Browser {
     Chrome,
     Firefox,
+    /// Safari iOS 26. Pair with a country-matched residential proxy for sites
+    /// that reject non-mobile profiles.
+    SafariIos,
     Random,
 }
 
@@ -377,6 +380,7 @@ impl From<Browser> for BrowserProfile {
         match b {
             Browser::Chrome => BrowserProfile::Chrome,
             Browser::Firefox => BrowserProfile::Firefox,
+            Browser::SafariIos => BrowserProfile::SafariIos,
             Browser::Random => BrowserProfile::Random,
         }
     }

crates/webclaw-core/src/markdown.rs

@@ -920,8 +920,10 @@ fn strip_markdown(md: &str) -> String {
             continue;
         }
 
-        // Convert table data rows: strip leading/trailing pipes, replace inner pipes with tabs
-        if trimmed.starts_with('|') && trimmed.ends_with('|') {
+        // Convert table data rows: strip leading/trailing pipes, replace inner pipes with tabs.
+        // Require at least 2 chars so the slice `[1..len-1]` stays non-empty on single-pipe rows
+        // (which aren't real tables anyway); a lone `|` previously panicked at `begin <= end`.
+        if trimmed.len() >= 2 && trimmed.starts_with('|') && trimmed.ends_with('|') {
             let inner = &trimmed[1..trimmed.len() - 1];
             let cells: Vec<&str> = inner.split('|').map(|c| c.trim()).collect();
             lines.push(cells.join("\t"));

crates/webclaw-fetch/Cargo.toml

@@ -14,6 +14,7 @@ tracing = { workspace = true }
 tokio = { workspace = true }
 async-trait = "0.1"
 wreq = { version = "6.0.0-rc.28", features = ["cookies", "gzip", "brotli", "zstd", "deflate"] }
+wreq-util = "3.0.0-rc.10"
 http = "1"
 bytes = "1"
 url = "2"

crates/webclaw-fetch/src/browser.rs

@@ -7,6 +7,10 @@ pub enum BrowserProfile {
     #[default]
     Chrome,
     Firefox,
+    /// Safari iOS 26 (iPhone). The one profile proven to defeat
+    /// DataDome's immobiliare.it / idealista.it / target.com-class
+    /// rules when paired with a country-scoped residential proxy.
+    SafariIos,
     /// Randomly pick from all available profiles on each request.
     Random,
 }
@@ -18,6 +22,7 @@ pub enum BrowserVariant {
     ChromeMacos,
     Firefox,
     Safari,
+    SafariIos26,
     Edge,
 }
 

crates/webclaw-fetch/src/client.rs

@@ -261,10 +261,65 @@ impl FetchClient {
         self.cloud.as_deref()
     }
 
+    /// Fetch a URL with per-site rescue paths: Reddit URLs redirect to the
+    /// `.json` API, and Akamai-style challenge responses trigger a homepage
+    /// cookie warmup and a retry. Returns the same `FetchResult` shape as
+    /// [`Self::fetch`] so every caller (CLI, MCP, OSS server, production
+    /// server) benefits without shape churn.
+    ///
+    /// This is the method most callers want. Use plain [`Self::fetch`] only
+    /// when you need literal no-rescue behavior (e.g. inside the rescue
+    /// logic itself to avoid recursion).
+    pub async fn fetch_smart(&self, url: &str) -> Result<FetchResult, FetchError> {
+        // Reddit: the HTML page shows a verification interstitial for most
+        // client IPs, but appending `.json` returns the post + comment tree
+        // publicly. `parse_reddit_json` in downstream code knows how to read
+        // the result; here we just do the URL swap at the fetch layer.
+        if crate::reddit::is_reddit_url(url) && !url.ends_with(".json") {
+            let json_url = crate::reddit::json_url(url);
+            // Reddit's public .json API serves JSON to identifiable bot
+            // User-Agents and blocks browser UAs with a verification wall.
+            // Override our Chrome-profile UA for this specific call.
+            let ua = concat!(
+                "Webclaw/",
+                env!("CARGO_PKG_VERSION"),
+                " (+https://webclaw.io)"
+            );
+            if let Ok(resp) = self
+                .fetch_with_headers(&json_url, &[("user-agent", ua)])
+                .await
+                && resp.status == 200
+            {
+                let first = resp.html.trim_start().as_bytes().first().copied();
+                if matches!(first, Some(b'{') | Some(b'[')) {
+                    return Ok(resp);
+                }
+            }
+            // If the .json fetch failed or returned HTML, fall through.
+        }
+
+        let resp = self.fetch(url).await?;
+
+        // Akamai / bazadebezolkohpepadr challenge: visit the homepage to
+        // collect warmup cookies (_abck, bm_sz, etc.), then retry.
+        if is_challenge_html(&resp.html)
+            && let Some(homepage) = extract_homepage(url)
+        {
+            debug!("challenge detected, warming cookies via {homepage}");
+            let _ = self.fetch(&homepage).await;
+            if let Ok(retry) = self.fetch(url).await {
+                return Ok(retry);
+            }
+        }
+
+        Ok(resp)
+    }
+
     /// Fetch a URL and return the raw HTML + response metadata.
     ///
     /// Automatically retries on transient failures (network errors, 5xx, 429)
-    /// with exponential backoff: 0s, 1s (2 attempts total).
+    /// with exponential backoff: 0s, 1s (2 attempts total). No per-site
+    /// rescue logic; use [`Self::fetch_smart`] for that.
     #[instrument(skip(self), fields(url = %url))]
     pub async fn fetch(&self, url: &str) -> Result<FetchResult, FetchError> {
         let delays = [Duration::ZERO, Duration::from_secs(1)];
@@ -635,6 +690,7 @@ fn collect_variants(profile: &BrowserProfile) -> Vec<BrowserVariant> {
         BrowserProfile::Random => browser::all_variants(),
         BrowserProfile::Chrome => vec![browser::latest_chrome()],
         BrowserProfile::Firefox => vec![browser::latest_firefox()],
+        BrowserProfile::SafariIos => vec![BrowserVariant::SafariIos26],
     }
 }
 
@@ -712,22 +768,23 @@ fn is_pdf_content_type(headers: &http::HeaderMap) -> bool {
 
 /// Detect if a response looks like a bot protection challenge page.
 fn is_challenge_response(response: &Response) -> bool {
-    let len = response.body().len();
+    is_challenge_html(response.text().as_ref())
+}
+
+/// Same as `is_challenge_response`, operating on a body string directly
+/// so callers holding a `FetchResult` can reuse the heuristic.
+fn is_challenge_html(html: &str) -> bool {
+    let len = html.len();
     if len > 15_000 || len == 0 {
         return false;
     }
-
-    let text = response.text();
-    let lower = text.to_lowercase();
-
+    let lower = html.to_lowercase();
     if lower.contains("<title>challenge page</title>") {
         return true;
     }
-
     if lower.contains("bazadebezolkohpepadr") && len < 5_000 {
         return true;
     }
-
     false
 }
 

crates/webclaw-fetch/src/lib.rs

@@ -10,6 +10,7 @@ pub mod error;
 pub mod extractors;
 pub mod fetcher;
 pub mod linkedin;
+pub mod locale;
 pub mod proxy;
 pub mod reddit;
 pub mod sitemap;
@@ -21,6 +22,7 @@ pub use crawler::{CrawlConfig, CrawlResult, CrawlState, Crawler, PageResult};
 pub use error::FetchError;
 pub use fetcher::Fetcher;
 pub use http::HeaderMap;
+pub use locale::{accept_language_for_tld, accept_language_for_url};
 pub use proxy::{parse_proxy_file, parse_proxy_line};
 pub use sitemap::SitemapEntry;
 pub use webclaw_pdf::PdfMode;

crates/webclaw-fetch/src/locale.rs

@@ -0,0 +1,77 @@
+//! Derive an `Accept-Language` header from a URL.
+//!
+//! DataDome-class bot detection on country-specific sites (e.g. immobiliare.it,
+//! leboncoin.fr) does a geo-vs-locale sanity check: residential IP in the
+//! target country + a browser UA but the wrong `Accept-Language` is a bot
+//! signal. Matching the site's expected locale gets us through.
+//!
+//! Default for unmapped TLDs is `en-US,en;q=0.9` — the global fallback.
+
+/// Best-effort `Accept-Language` header value for the given URL's TLD.
+/// Returns `None` if the URL cannot be parsed.
+pub fn accept_language_for_url(url: &str) -> Option<&'static str> {
+    let host = url::Url::parse(url).ok()?.host_str()?.to_ascii_lowercase();
+    let tld = host.rsplit('.').next()?;
+    Some(accept_language_for_tld(tld))
+}
+
+/// Map a bare TLD like `it`, `fr`, `de` to a plausible `Accept-Language`.
+/// Unknown TLDs fall back to US English.
+pub fn accept_language_for_tld(tld: &str) -> &'static str {
+    match tld {
+        "it" => "it-IT,it;q=0.9",
+        "fr" => "fr-FR,fr;q=0.9",
+        "de" | "at" => "de-DE,de;q=0.9",
+        "es" => "es-ES,es;q=0.9",
+        "pt" => "pt-PT,pt;q=0.9",
+        "nl" => "nl-NL,nl;q=0.9",
+        "pl" => "pl-PL,pl;q=0.9",
+        "se" => "sv-SE,sv;q=0.9",
+        "no" => "nb-NO,nb;q=0.9",
+        "dk" => "da-DK,da;q=0.9",
+        "fi" => "fi-FI,fi;q=0.9",
+        "cz" => "cs-CZ,cs;q=0.9",
+        "ro" => "ro-RO,ro;q=0.9",
+        "gr" => "el-GR,el;q=0.9",
+        "tr" => "tr-TR,tr;q=0.9",
+        "ru" => "ru-RU,ru;q=0.9",
+        "jp" => "ja-JP,ja;q=0.9",
+        "kr" => "ko-KR,ko;q=0.9",
+        "cn" => "zh-CN,zh;q=0.9",
+        "tw" | "hk" => "zh-TW,zh;q=0.9",
+        "br" => "pt-BR,pt;q=0.9",
+        "mx" | "ar" | "co" | "cl" | "pe" => "es-ES,es;q=0.9",
+        "uk" | "ie" => "en-GB,en;q=0.9",
+        _ => "en-US,en;q=0.9",
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn tld_dispatch() {
+        assert_eq!(
+            accept_language_for_url("https://www.immobiliare.it/annunci/1"),
+            Some("it-IT,it;q=0.9")
+        );
+        assert_eq!(
+            accept_language_for_url("https://www.leboncoin.fr/"),
+            Some("fr-FR,fr;q=0.9")
+        );
+        assert_eq!(
+            accept_language_for_url("https://www.amazon.co.uk/"),
+            Some("en-GB,en;q=0.9")
+        );
+        assert_eq!(
+            accept_language_for_url("https://example.com/"),
+            Some("en-US,en;q=0.9")
+        );
+    }
+
+    #[test]
+    fn bad_url_returns_none() {
+        assert_eq!(accept_language_for_url("not-a-url"), None);
+    }
+}

crates/webclaw-fetch/src/tls.rs

@@ -7,10 +7,15 @@
 
 use std::time::Duration;
 
+use std::borrow::Cow;
+
 use wreq::http2::{
     Http2Options, PseudoId, PseudoOrder, SettingId, SettingsOrder, StreamDependency, StreamId,
 };
-use wreq::tls::{AlpsProtocol, CertificateCompressionAlgorithm, TlsOptions, TlsVersion};
+use wreq::tls::{
+    AlpnProtocol, AlpsProtocol, CertificateCompressionAlgorithm, ExtensionType, TlsOptions,
+    TlsVersion,
+};
 use wreq::{Client, Emulation};
 
 use crate::browser::BrowserVariant;
@@ -43,6 +48,55 @@ const SAFARI_SIGALGS: &str = "ecdsa_secp256r1_sha256:rsa_pss_rsae_sha256:rsa_pkc
 /// Safari curves.
 const SAFARI_CURVES: &str = "X25519:P-256:P-384:P-521";
 
+/// Safari iOS 26 TLS extension order, matching bogdanfinn's
+/// `safari_ios_26_0` wire format. GREASE slots are omitted. wreq
+/// inserts them itself. Diverges from wreq-util's default SafariIos26
+/// extension order, which DataDome's immobiliare.it ruleset flags.
+fn safari_ios_extensions() -> Vec<ExtensionType> {
+    vec![
+        ExtensionType::CERTIFICATE_TIMESTAMP,
+        ExtensionType::APPLICATION_LAYER_PROTOCOL_NEGOTIATION,
+        ExtensionType::SERVER_NAME,
+        ExtensionType::CERT_COMPRESSION,
+        ExtensionType::KEY_SHARE,
+        ExtensionType::SUPPORTED_VERSIONS,
+        ExtensionType::PSK_KEY_EXCHANGE_MODES,
+        ExtensionType::SUPPORTED_GROUPS,
+        ExtensionType::RENEGOTIATE,
+        ExtensionType::SIGNATURE_ALGORITHMS,
+        ExtensionType::STATUS_REQUEST,
+        ExtensionType::EC_POINT_FORMATS,
+        ExtensionType::EXTENDED_MASTER_SECRET,
+    ]
+}
+
+/// Chrome 133 TLS extension order, matching bogdanfinn's stable JA3
+/// (`43067709b025da334de1279a120f8e14`). Real Chrome permutes extensions
+/// per handshake, but indeed.com's WAF allowlists this specific wire order
+/// and rejects permuted ones. GREASE slots are inserted by wreq.
+///
+/// JA3 extension field from peet.ws: 18-5-35-51-10-45-11-27-17613-43-13-0-16-65037-65281-23
+fn chrome_extensions() -> Vec<ExtensionType> {
+    vec![
+        ExtensionType::CERTIFICATE_TIMESTAMP,                  // 18
+        ExtensionType::STATUS_REQUEST,                         // 5
+        ExtensionType::SESSION_TICKET,                         // 35
+        ExtensionType::KEY_SHARE,                              // 51
+        ExtensionType::SUPPORTED_GROUPS,                       // 10
+        ExtensionType::PSK_KEY_EXCHANGE_MODES,                 // 45
+        ExtensionType::EC_POINT_FORMATS,                       // 11
+        ExtensionType::CERT_COMPRESSION,                       // 27
+        ExtensionType::APPLICATION_SETTINGS_NEW, // 17613 (new codepoint, matches alps_use_new_codepoint)
+        ExtensionType::SUPPORTED_VERSIONS,       // 43
+        ExtensionType::SIGNATURE_ALGORITHMS,     // 13
+        ExtensionType::SERVER_NAME,              // 0
+        ExtensionType::APPLICATION_LAYER_PROTOCOL_NEGOTIATION, // 16
+        ExtensionType::ENCRYPTED_CLIENT_HELLO,   // 65037
+        ExtensionType::RENEGOTIATE,              // 65281
+        ExtensionType::EXTENDED_MASTER_SECRET,   // 23
+    ]
+}
+
 // --- Chrome HTTP headers in correct wire order ---
 
 const CHROME_HEADERS: &[(&str, &str)] = &[
@@ -130,6 +184,26 @@ const SAFARI_HEADERS: &[(&str, &str)] = &[
     ("sec-fetch-dest", "document"),
 ];
 
+/// Safari iOS 26 headers, in the wire order real Safari emits. Critically:
+/// NO `sec-fetch-*`, NO `priority: u=0, i` (both Chromium-only leaks), but
+/// `upgrade-insecure-requests: 1` is present. `accept-encoding` does not
+/// include zstd (Safari can't decode it). Verified against bogdanfinn on
+/// 2026-04-22: this header set is what DataDome's immobiliare ruleset
+/// expects for a real iPhone.
+const SAFARI_IOS_HEADERS: &[(&str, &str)] = &[
+    (
+        "accept",
+        "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
+    ),
+    ("accept-language", "en-US,en;q=0.9"),
+    ("accept-encoding", "gzip, deflate, br"),
+    (
+        "user-agent",
+        "Mozilla/5.0 (iPhone; CPU iPhone OS 26_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Mobile/15E148 Safari/604.1",
+    ),
+    ("upgrade-insecure-requests", "1"),
+];
+
 const EDGE_HEADERS: &[(&str, &str)] = &[
     (
         "sec-ch-ua",
@@ -156,6 +230,9 @@ const EDGE_HEADERS: &[(&str, &str)] = &[
 ];
 
 fn chrome_tls() -> TlsOptions {
+    // permute_extensions is off so the explicit extension_permutation sticks.
+    // Real Chrome permutes, but indeed.com's WAF allowlists bogdanfinn's
+    // fixed order, so matching that gets us through.
     TlsOptions::builder()
         .cipher_list(CHROME_CIPHERS)
         .sigalgs_list(CHROME_SIGALGS)
@@ -163,12 +240,18 @@ fn chrome_tls() -> TlsOptions {
         .min_tls_version(TlsVersion::TLS_1_2)
         .max_tls_version(TlsVersion::TLS_1_3)
         .grease_enabled(true)
-        .permute_extensions(true)
+        .permute_extensions(false)
+        .extension_permutation(chrome_extensions())
         .enable_ech_grease(true)
         .pre_shared_key(true)
         .enable_ocsp_stapling(true)
         .enable_signed_cert_timestamps(true)
-        .alps_protocols([AlpsProtocol::HTTP2])
+        .alpn_protocols([
+            AlpnProtocol::HTTP3,
+            AlpnProtocol::HTTP2,
+            AlpnProtocol::HTTP1,
+        ])
+        .alps_protocols([AlpsProtocol::HTTP3, AlpsProtocol::HTTP2])
         .alps_use_new_codepoint(true)
         .aes_hw_override(true)
         .certificate_compression_algorithms(&[CertificateCompressionAlgorithm::BROTLI])
@@ -212,25 +295,70 @@ fn safari_tls() -> TlsOptions {
         .build()
 }
 
+/// Safari iOS 26 emulation — composed on top of `wreq_util::Emulation::SafariIos26`
+/// with four targeted overrides. We don't hand-roll this one like Chrome/Firefox
+/// because the wire-level defaults from wreq-util are already correct for ciphers,
+/// sigalgs, curves, and GREASE — the four things wreq-util gets *wrong* for
+/// DataDome compatibility are overridden here:
+///
+///  1. TLS extension order: match bogdanfinn `safari_ios_26_0` exactly (JA3
+///     ends up `8d909525bd5bbb79f133d11cc05159fe`).
+///  2. HTTP/2 HEADERS priority flag: weight=256, exclusive=1, depends_on=0.
+///     wreq-util omits this frame; real Safari and bogdanfinn include it.
+///     This flip is the thing DataDome actually reads — the akamai_fingerprint
+///     hash changes from `c52879e43202aeb92740be6e8c86ea96` to
+///     `d1294410a06522e37a5c5e3f0a45a705`, which is the winning signature.
+///  3. Headers: strip wreq-util's Chromium defaults (`sec-fetch-*`,
+///     `priority: u=0, i`, zstd), replace with the real iOS 26 set.
+///  4. `accept-language` preserved from config.extra_headers for locale.
+fn safari_ios_emulation() -> wreq::Emulation {
+    use wreq::EmulationFactory;
+    let mut em = wreq_util::Emulation::SafariIos26.emulation();
+
+    if let Some(tls) = em.tls_options_mut().as_mut() {
+        tls.extension_permutation = Some(Cow::Owned(safari_ios_extensions()));
+    }
+
+    // Only override the priority flag — keep wreq-util's SETTINGS, WINDOW_UPDATE,
+    // and pseudo-order intact. Replacing the whole Http2Options resets SETTINGS
+    // to defaults, which sends only INITIAL_WINDOW_SIZE and fails DataDome.
+    if let Some(h2) = em.http2_options_mut().as_mut() {
+        h2.headers_stream_dependency = Some(StreamDependency::new(StreamId::zero(), 255, true));
+    }
+
+    let hm = em.headers_mut();
+    hm.clear();
+    for (k, v) in SAFARI_IOS_HEADERS {
+        if let (Ok(n), Ok(val)) = (
+            http::header::HeaderName::from_bytes(k.as_bytes()),
+            http::header::HeaderValue::from_str(v),
+        ) {
+            hm.append(n, val);
+        }
+    }
+
+    em
+}
+
 fn chrome_h2() -> Http2Options {
+    // SETTINGS frame matches bogdanfinn `chrome_133`: HEADER_TABLE_SIZE,
+    // ENABLE_PUSH=0, INITIAL_WINDOW_SIZE, MAX_HEADER_LIST_SIZE. No
+    // MAX_CONCURRENT_STREAMS — real Chrome 133 and bogdanfinn both omit it,
+    // and indeed.com's WAF reads this as a bot signal when present. Priority
+    // weight 256 (encoded as 255 + 1) matches bogdanfinn's HEADERS frame.
     Http2Options::builder()
         .initial_window_size(6_291_456)
         .initial_connection_window_size(15_728_640)
         .max_header_list_size(262_144)
         .header_table_size(65_536)
-        .max_concurrent_streams(1000u32)
         .enable_push(false)
         .settings_order(
             SettingsOrder::builder()
                 .extend([
                     SettingId::HeaderTableSize,
                     SettingId::EnablePush,
-                    SettingId::MaxConcurrentStreams,
                     SettingId::InitialWindowSize,
-                    SettingId::MaxFrameSize,
                     SettingId::MaxHeaderListSize,
-                    SettingId::EnableConnectProtocol,
-                    SettingId::NoRfc7540Priorities,
                 ])
                 .build(),
         )
@@ -244,7 +372,7 @@ fn chrome_h2() -> Http2Options {
                 ])
                 .build(),
         )
-        .headers_stream_dependency(StreamDependency::new(StreamId::zero(), 219, true))
+        .headers_stream_dependency(StreamDependency::new(StreamId::zero(), 255, true))
         .build()
 }
 
@@ -328,32 +456,38 @@ pub fn build_client(
     extra_headers: &std::collections::HashMap<String, String>,
     proxy: Option<&str>,
 ) -> Result<Client, FetchError> {
-    let (tls, h2, headers) = match variant {
-        BrowserVariant::Chrome => (chrome_tls(), chrome_h2(), CHROME_HEADERS),
-        BrowserVariant::ChromeMacos => (chrome_tls(), chrome_h2(), CHROME_MACOS_HEADERS),
-        BrowserVariant::Firefox => (firefox_tls(), firefox_h2(), FIREFOX_HEADERS),
-        BrowserVariant::Safari => (safari_tls(), safari_h2(), SAFARI_HEADERS),
-        BrowserVariant::Edge => (chrome_tls(), chrome_h2(), EDGE_HEADERS),
+    // SafariIos26 builds its Emulation on top of wreq-util's base instead
+    // of from scratch. See `safari_ios_emulation` for why.
+    let mut emulation = match variant {
+        BrowserVariant::SafariIos26 => safari_ios_emulation(),
+        other => {
+            let (tls, h2, headers) = match other {
+                BrowserVariant::Chrome => (chrome_tls(), chrome_h2(), CHROME_HEADERS),
+                BrowserVariant::ChromeMacos => (chrome_tls(), chrome_h2(), CHROME_MACOS_HEADERS),
+                BrowserVariant::Firefox => (firefox_tls(), firefox_h2(), FIREFOX_HEADERS),
+                BrowserVariant::Safari => (safari_tls(), safari_h2(), SAFARI_HEADERS),
+                BrowserVariant::Edge => (chrome_tls(), chrome_h2(), EDGE_HEADERS),
+                BrowserVariant::SafariIos26 => unreachable!("handled above"),
+            };
+            Emulation::builder()
+                .tls_options(tls)
+                .http2_options(h2)
+                .headers(build_headers(headers))
+                .build()
+        }
     };
 
-    let mut header_map = build_headers(headers);
-
-    // Append extra headers after profile defaults
+    // Append extra headers after profile defaults.
+    let hm = emulation.headers_mut();
     for (k, v) in extra_headers {
         if let (Ok(n), Ok(val)) = (
             http::header::HeaderName::from_bytes(k.as_bytes()),
             http::header::HeaderValue::from_str(v),
         ) {
-            header_map.insert(n, val);
+            hm.insert(n, val);
         }
     }
 
-    let emulation = Emulation::builder()
-        .tls_options(tls)
-        .http2_options(h2)
-        .headers(header_map)
-        .build();
-
     let mut builder = Client::builder()
         .emulation(emulation)
         .redirect(wreq::redirect::Policy::limited(10))

crates/webclaw-mcp/src/server.rs

@@ -749,16 +749,21 @@ impl WebclawMcp {
         Parameters(params): Parameters<VerticalParams>,
     ) -> Result<String, String> {
         validate_url(&params.url)?;
-        // Reuse the long-lived default FetchClient. Extractors accept
-        // `&dyn Fetcher`; FetchClient implements the trait so this just
-        // works (see webclaw_fetch::Fetcher and client::FetchClient).
-        let data = webclaw_fetch::extractors::dispatch_by_name(
-            self.fetch_client.as_ref(),
-            &params.name,
-            &params.url,
-        )
-        .await
-        .map_err(|e| e.to_string())?;
+        // Use the cached Firefox client, not the default Chrome one.
+        // Reddit's `.json` endpoint rejects the wreq-Chrome TLS
+        // fingerprint with a 403 even from residential IPs (they
+        // ship a fingerprint blocklist that includes common
+        // browser-emulation libraries). The wreq-Firefox fingerprint
+        // still passes, and Firefox is equally fine for every other
+        // vertical in the catalog, so it's a strictly-safer default
+        // for `vertical_scrape` than the generic `scrape` tool's
+        // Chrome default. Matches the CLI `webclaw vertical`
+        // subcommand which already uses Firefox.
+        let client = self.firefox_or_build()?;
+        let data =
+            webclaw_fetch::extractors::dispatch_by_name(client.as_ref(), &params.name, &params.url)
+                .await
+                .map_err(|e| e.to_string())?;
         serde_json::to_string_pretty(&data)
             .map_err(|e| format!("failed to serialise extractor output: {e}"))
     }