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fix(core): route direct font fetches through the browser's --proxy-server - #2452
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…rver Font responses are re-fetched from Node (makeDirectRequest) because browser bodies can be badly encoded. That Node request only honoured HTTP(S)_PROXY, so when Chrome was launched with `--proxy-server` (e.g. the visual scanner sending traffic through privoxy to a BrowserStack Local tunnel), every font on a tunnel-only host failed with `getaddrinfo ENOTFOUND` and was dropped from the snapshot while the rest of the page captured fine. directFetch now resolves the proxy Chrome itself would use for the URL from the launch args (`--proxy-server`, per-scheme rules, `--proxy-bypass-list` incl. implicit loopback bypass and `<-loopback>`), and @percy/client's request() accepts an explicit `proxy` that takes precedence over the env vars, NO_PROXY and PAC. SOCKS/direct rules fall back to the existing env behaviour. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Note Some coding-guideline sources were skipped; the reason is listed next to each one. Other guidelines were applied as usual. On a public repository, sources from your configuration are listed without their names. Skipped guideline sources (4)📝 WalkthroughWalkthroughThe client request API accepts an explicit proxy URL and applies request timeouts to proxy CONNECT handshakes. Core direct fetch selects an HTTP(S) proxy from browser arguments and the request URL. It retries through the default route after a proxy request returns status 407 or no response. ChangesProxy routing
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant DirectFetch as Network.directFetch
participant ProxySelector as browserProxyFor
participant Request as makeRequest
DirectFetch->>ProxySelector: browser arguments and request URL
ProxySelector-->>DirectFetch: selected proxy or undefined
DirectFetch->>Request: request through selected proxy
Request-->>DirectFetch: response or proxy failure
DirectFetch->>Request: retry through default route after no response or status 407
Suggested reviewers: Merge Risk: 🟡 Moderate · up to When the first configured proxy is unavailable, direct font fetches do not try later Chrome fallback proxies, so fonts reachable through a later proxy can still be omitted. Resolve or explicitly accept this configuration gap before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (3 passed)
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Review comments at @packages/core/src/utils.js:
- Line 173: Update the rule fallback in browserProxyFor to select a socks=
mapping when no exact scheme match or scheme-less rule exists. Preserve the
existing handling of unsupported SOCKS proxy URLs.
- Line 176: Update the proxy selection logic around
`rule.replace(...).split(',')[0]` to retain the ordered proxy list and try
subsequent proxies when an earlier proxy fails, matching Chrome’s failover
behavior. Ensure request retries advance through that list rather than
repeatedly using the first proxy.
- Around line 191-192: Update the hostname implicit-bypass check to recognize
IPv4 and IPv6 link-local literals, including the 169.254.0.0/16 and fe80::/10
ranges. Preserve the existing loopback checks and the condition that respects
the <-loopback> exception.
- Line 198: Update the bypass-rule matching around
`rule.replace(...).match(...)` to retain and enforce any scheme restriction
instead of stripping the scheme before matching. Also support IP-range rules
such as CIDR notation by matching them against IP-literal URLs, while preserving
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GitHub Actions: Semgrep / 0_semgrep_ci.txt: fix(core): route direct font fetches through the browser's --proxy-server
Conclusion: failure
##[group]Run semgrep ci --sarif --output=semgrep.sarif
�[36;1msemgrep ci --sarif --output=semgrep.sarif�[0m
shell: sh -e {0}
env:
SEMGREP_RULES: p/default
##[endgroup]
┌────────────────┐
│ Debugging Info │
└────────────────┘
SCAN ENVIRONMENT
versions - semgrep 1.164.0 on python 3.12.13
environment - running in environment github-actions, triggering event is pull_request
Fixing git state for github action pull request
Not on head ref: c2f52c2522972991c73c20a7c73c2cb30a11cea4; checking that out now.
Using db9defd63c15c8c4a756b045fcb23d5cabfa23b8 as the merge-base of db9defd63c15c8c4a756b045fcb23d5cabfa23b8 and c2f52c2522972991c73c20a7c73c2cb30a11cea4
Using git merge base detected from environment for diff scans: db9defd63c15c8c4a756b045fcb23d5cabfa23b8
┌─────────────┐
│ Scan Status │
└─────────────┘
Scanning 8 files tracked by git with 1074 Code rules:
Language Rules Files Origin Rules
───────────────────────────── ───────────────────
js 153 8 Community 1074
<multilang> 47 8
Current version has 11 findings.
Creating git worktree from 'db9defd63c15c8c4a756b045fcb23d5cabfa23b8' to scan baseline.
Will report findings introduced by these commits (may be incomplete for shallow checkouts):
* c2f52c2 fix(core): route direct font fetches through the browser's --proxy-server
┌─────────────┐
│ Scan Status │
└─────────────┘
Scanning 4 files tracked by git with 5 Code rules:
Language Rules Files Origin Rules
───────────────────────────── ───────────────────
js 4 4 Community 5
<multilang> 1 4
┌──────────────┐
│ Scan Summary │
└──────────────┘
✅ CI scan completed successfully.
• Findings: 1 (1 blocking)
• Rules run: 1074
• Targets scanned: 8
• Parsed lines: ~100.0%
• Scan was limited to files changed since baseline commit.
• For a detailed list of...
GitHub Actions: Semgrep / semgrep_ci: fix(core): route direct font fetches through the browser's --proxy-server
Conclusion: failure
##[group]Run semgrep ci --sarif --output=semgrep.sarif
�[36;1msemgrep ci --sarif --output=semgrep.sarif�[0m
shell: sh -e {0}
env:
SEMGREP_RULES: p/default
##[endgroup]
┌────────────────┐
│ Debugging Info │
└────────────────┘
SCAN ENVIRONMENT
versions - semgrep 1.164.0 on python 3.12.13
environment - running in environment github-actions, triggering event is pull_request
Fixing git state for github action pull request
Not on head ref: c2f52c2522972991c73c20a7c73c2cb30a11cea4; checking that out now.
Using db9defd63c15c8c4a756b045fcb23d5cabfa23b8 as the merge-base of db9defd63c15c8c4a756b045fcb23d5cabfa23b8 and c2f52c2522972991c73c20a7c73c2cb30a11cea4
Using git merge base detected from environment for diff scans: db9defd63c15c8c4a756b045fcb23d5cabfa23b8
┌─────────────┐
│ Scan Status │
└─────────────┘
Scanning 8 files tracked by git with 1074 Code rules:
Language Rules Files Origin Rules
───────────────────────────── ───────────────────
js 153 8 Community 1074
<multilang> 47 8
Current version has 11 findings.
Creating git worktree from 'db9defd63c15c8c4a756b045fcb23d5cabfa23b8' to scan baseline.
Will report findings introduced by these commits (may be incomplete for shallow checkouts):
* c2f52c2 fix(core): route direct font fetches through the browser's --proxy-server
┌─────────────┐
│ Scan Status │
└─────────────┘
Scanning 4 files tracked by git with 5 Code rules:
Language Rules Files Origin Rules
───────────────────────────── ───────────────────
js 4 4 Community 5
<multilang> 1 4
┌──────────────┐
│ Scan Summary │
└──────────────┘
✅ CI scan completed successfully.
• Findings: 1 (1 blocking)
• Rules run: 1074
• Targets scanned: 8
• Parsed lines: ~100.0%
• Scan was limited to files changed since baseline commit.
• For a detailed list of...
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🪛 ast-grep (0.45.3)
packages/core/src/utils.js
[warning] 202-202: Detects non-literal values in regular expressions
Context: new RegExp(^${glob}$)
Note: [CWE-1333] Inefficient Regular Expression Complexity (ReDoS via non-literal RegExp).
(detect-non-literal-regexp)
🪛 GitHub Check: Semgrep OSS
packages/core/src/utils.js
[warning] 203-203: Semgrep Finding: javascript.lang.security.audit.detect-non-literal-regexp.detect-non-literal-regexp
RegExp() called with a rule function argument, this might allow an attacker to cause a Regular Expression Denial-of-Service (ReDoS) within your application as RegExP blocks the main thread. For this reason, it is recommended to use hardcoded regexes instead. If your regex is run on user-controlled input, consider performing input validation or use a regex checking/sanitization library such as https://www.npmjs.com/package/recheck to verify that the regex does not appear vulnerable to ReDoS.
Address CodeQL and semgrep findings on the browser-proxy change: - semgrep (detect-non-literal-regexp): bypass-list globs are now matched by a linear `*` wildcard matcher instead of building a RegExp from user input. - CodeQL (polynomial regex on library input): an explicit proxy override is used verbatim; only env-sourced proxy URLs go through stripQuotesAndSpaces. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
browserProxyFor (review feedback): - use the `socks=` mapping as the fallback for schemes without their own (an http proxy there is honoured; a scheme-less one is SOCKS4, unsupported) - implicitly bypass link-local hosts (169.254/16, fe80::/10) like loopback - enforce scheme-restricted bypass rules and match CIDR rules (IPv4/IPv6) against IP-literal hosts ProxyHttpsAgent: detach the CONNECT handshake's error/close listeners once the tunnel is established. Previously the normal keep-alive teardown of a proxied https connection logged "Proxying request ... failed: Connection closed while sending request to upstream proxy" plus a network warning and re-invoked the connection callback. Seen on every proxied run, including HTTP_PROXY on master. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude Code PR ReviewPR: #2452 • Head: 3b71d9d • Reviewers: stack-code-reviewer SummaryRoutes the CLI's Node-side font re-fetch through the proxy Chrome was launched with ( Review Table
Findings
Verdict: PASS — no High or Critical findings. The Medium and Low items are addressed in the follow-up push. |
- getProxy: keep the explicit override out of the env-value quote stripping entirely (separate variable), so CodeQL's js/polynomial-redos flow no longer runs through code changed here. Behaviour is unchanged. - cidrMatches: guard net.BlockList (Node >= 14.18); CIDR rules are left unmatched on older 14.x instead of throwing. - globMatches: support `?` like Chrome's MatchPattern. - tests: an established tunnel failing mid-response rejects the request without an unhandled error; move no_proxy cleanup into afterEach. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude Code PR ReviewContinues the previous review — changes since PR: #2452 • Head: 8f5bd6e • Reviewers: stack-code-reviewer SummaryFollow-up to the review. The CodeQL Review Table
Findings
Carried-forward findings from
Verdict: PASS — no High or Critical findings open. |
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/core/src/utils.js:
- Around line 228-237: Update CIDR prefix parsing in the function containing
`net.BlockList` to accept only non-empty decimal digits before converting the
prefix to a number. Reject empty prefixes and other numeric formats so malformed
CIDR rules cannot match addresses.
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🪛 ast-grep (0.45.3)
packages/client/test/unit/request.test.js
[warning] 436-436: Avoid using the initial state variable in setState
Context: setTimeout(r, 50)
Note: [CWE-710] Improper Adherence to Coding Standards. Security best practice.
(setstate-same-var)
[warning] 449-449: Avoid using the initial state variable in setState
Context: setTimeout(r, 100)
Note: [CWE-710] Improper Adherence to Coding Standards. Security best practice.
(setstate-same-var)
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percy/percy-selenium-dotnet
- This is an indirect consumer of the CLI:
package.json:4,7runs tests withpercy execand declares@percy/cli; the README documents that this flow creates a build and takes .NET snapshots (README.md:93-106). Snapshot submission goes through the CLI endpoint (Percy/Percy.cs:1665). The CLI change can therefore affect font/resource discovery for snapshots produced through this SDK. - I found no direct use of the changed proxy APIs or explicit proxy configuration in this repository; proxy-related search hits were dependency entries in
package-lock.json. [::percy/percy-selenium-dotnet::]
🔇 Additional comments (3)
packages/client/src/proxy.js (1)
92-102: LGTM!packages/client/test/unit/proxy.test.js (1)
11-13: LGTM!packages/client/test/unit/request.test.js (1)
433-454: LGTM!
Number('') is 0, so a rule like `10.0.0.0/` became /0 and bypassed the proxy
for every IPv4 literal; '1e1', '0x8', ' 8' and extra '/' segments were also
accepted. Only a plain decimal prefix (and a single '/') is now valid.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Restores 100% statement coverage of packages/core/src/utils.js: the leftover-'*' loop in globMatches only runs when the host is exhausted before trailing stars, e.g. 'a.com**' against 'a.com'. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Routing the direct font fetch through Chrome's `--proxy-server` regressed setups that worked before: an authenticated proxy (Chrome answers the 407 with discovery.authorization, the Node fetch cannot), with or without HTTPS_PROXY=http://user:pass@... for the CLI, and proxies that refuse a non-browser client. Verified with real builds: fonts captured on master, dropped on this branch. When the fetch through the browser proxy fails at the proxy (407, or no response from the target at all), retry via the pre-change route (env proxy or direct), so anything that fetched before still does. Error responses from the target are not retried. Also fix ProxyHttpAgent logging "Proxying request: undefined". Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Review comments at @packages/core/src/network.js:
- Around line 663-665: Update the local fetch function in
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404 response limited to direct fetches and the 200 response for other requests.
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packages/client/src/proxy.js (1)
143-143: LGTM!
…hable A proxy that accepts the connection and then stalls would hang the font re-fetch (which has no overall timeout), so the default-route fallback was never reached. The proxied attempt now uses DIRECT_FETCH_TIMEOUT as an idle timeout (30s under PERCY_GZIP) via a shared directFetchTimeout() helper; a timeout has no response, so it falls back like a 407. Also make the "no fallback on a 404" test's handler explicit. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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- Line 983: Update the timeout budget in captureResourceDirectly so it allows
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than expiring alongside the per-attempt timeout. When the outer timeout does
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package-lock.json. [::percy/percy-selenium-dotnet::]
captureResourceDirectly races the whole direct fetch against one DIRECT_FETCH_TIMEOUT. Through a browser proxy, a stalled proxied attempt uses that same timeout before falling back, so the outer race fired first and the fallback never ran. When a browser proxy applies, budget for both attempts (2x); without one the budget is unchanged. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Node arms a request's `timeout` only once the request has a socket, and ProxyHttpsAgent hands the socket over after the proxy answers CONNECT. A proxy that accepts the connection and never answers therefore hung the request forever. For the browser-proxy font fetch that meant the fallback never ran and the snapshot failed waiting for the network to idle. Apply the request's timeout to the handshake and clear it once the tunnel is established. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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- Around line 226-228: Make ProxyHttpsAgent.handleError idempotent by tracking
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Destroying the socket re-emits 'error' and 'close', so a failed handshake called the createConnection callback and logged the failure up to three times. Ignore everything after the first failure. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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packages/client/test/unit/request.test.js
[warning] 467-467: Avoid using the initial state variable in setState
Context: setTimeout(r, 50)
Note: [CWE-710] Improper Adherence to Coding Standards. Security best practice.
(setstate-same-var)
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2 participants
Problem
Visual scanner builds run Percy with
discovery.launchOptions.args: ['--proxy-server=http://127.0.0.1:8118', ...]so that Chrome goes through privoxy to a BrowserStack Local tunnel. The customer's site (nestscheme-sit6.uk.tapue.com) only resolves through that tunnel.The page, CSS and images captured fine. Self-hosted fonts were dropped every time:
The cause: once Chrome has received a font,
saveResponseResourcere-fetches it from Node (makeDirectRequest→network.directFetch), because font bodies from the browser can be badly encoded. That Node request only honoursHTTP(S)_PROXY, and it knows nothing about Chrome's--proxy-server. So it skips the tunnel and fails DNS. Google Fonts worked only because those hosts resolve publicly.Fix
@percy/core: newbrowserProxyFor(args, url)returns the proxy Chrome would use for a URL, based on the browser's launch args.--proxy-server: a barehost:port(treated as http),http(s)://URLs, per-scheme rules likehttps=…;http=…, thesocks=fallback mapping, and the first entry of a fallback list.--proxy-bypass-list: host globs (*,?, and a leading.meaning*.), optional scheme and port, CIDR ranges (IPv4 and IPv6),<local>, Chrome's implicit loopback and link-local bypass, and<-loopback>to turn the implicit bypass off.direct://rules returnundefined, so those setups keep today's env-var behaviour.directFetchretries via the pre-change route (env proxy or direct). Error responses from the target are not retried. Without this, authenticated-proxy setups regressed: Chrome answers the 407 withdiscovery.authorization, but the Node fetch can't. Real builds confirmed the font was captured on master and dropped without the fallback.@percy/client:request()takes aproxyoption.getProxy(options, override)uses it ahead ofHTTP(S)_PROXY,NO_PROXYand PAC. Behaviour without the option is unchanged.ProxyHttpsAgentno longer reports a false "Connection closed while sending request to upstream proxy" failure, plus a network warning, when an established tunnel later closes. That noise appeared at the end of every proxied run, includingHTTP_PROXYon master.ProxyHttpAgentno longer logs "Proxying request: undefined".SSRF note: on a proxied direct fetch, the proxy resolves the target, so the connected-IP metadata gate only sees the proxy's address. That matches the browser path. The literal-host
isMetadataTargetcheck still aborts metadata targets before any fetch.Tests
NO_PROXY/PAC, the 407 fallback (and no fallback on a 404 from the target), a tunnel close or failure without false errors or crashes, and malformed CIDR rules. The discovery e2e test fails without the fix.ENOTFOUND); master withHTTP_PROXYcaptures it.socks=mapping, a fallback list, a SOCKS5 proxy (unsupported, as before), SOCKS5 plus the env fallback, an HTTPS proxy, and an authenticated proxy (fallback via env credentials, and via a direct fetch).<-loopback>, CIDR, scheme match and mismatch, port match and mismatch, glob, and<local>.HTTP(S)_PROXY/NO_PROXY, a proxy refusing the CLI's CONNECT (clean error, no hang), site basic auth plus cookies through the proxy, a redirect to a second tunnel-only host, the SDK path (percy execwith a DOM snapshot), and the pkg-builtpercybinary (customer config, and multi-width with CIDR).discovery.authorization. The Node fetch can't answer the 407, falls back to a direct fetch, and the font is dropped. Chrome also rejects credentials inside--proxy-server(ERR_NO_SUPPORTED_PROXIES), so that config doesn't work either.Workaround until released
Set
HTTPS_PROXY/HTTP_PROXY=http://127.0.0.1:8118in the environment of thepercyprocess itself, withNO_PROXYcoveringpercy.ioand.browserstack.com.🤖 Generated with Claude Code
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