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Crawl4AI v0.9.1: Bug Fixes & PruningContentFilter Whitelist

July 2026 - 3 min read

I'm releasing Crawl4AI v0.9.1, a patch release that ships 12 bug fixes across Docker, browser, core, and extraction, plus one new feature for PruningContentFilter.

No breaking changes. If you're on v0.9.0, upgrade freely.

What's new at a glance

  • PruningContentFilter whitelist: New preserve_classes / preserve_tags parameters to protect specific elements from density-based pruning
  • Windows browser fix: Default channel='chromium' no longer crashes Playwright on Windows
  • Docker hardening: 6 fixes for auth gate, supervisord, redis, tmpfs, and FastAPI compatibility
  • HTTP timeout fix: page_timeout was passed in milliseconds to aiohttp (which expects seconds), effectively disabling timeouts in HTTP mode
  • Dependency: lxml ceiling widened to allow 6.x

PruningContentFilter whitelist

PruningContentFilter's density-based scoring is great at stripping boilerplate, but it sometimes takes short metadata elements — author names, timestamps, attribution lines — along with it. The new preserve_classes and preserve_tags parameters let you whitelist specific CSS classes or HTML tags that should never be pruned, regardless of their density score.

from crawl4ai.content_filter_strategy import PruningContentFilter
from crawl4ai.markdown_generation_strategy import DefaultMarkdownGenerator

filter = PruningContentFilter(
    threshold=0.48,
    preserve_classes=["author", "byline", "dateline"],
    preserve_tags=["time", "address"],
)
generator = DefaultMarkdownGenerator(content_filter=filter)

config = CrawlerRunConfig(markdown_generator=generator)

Whitelisted nodes skip scoring entirely. Default is empty sets — no behavior change for existing users. (#1900, thanks @hafezparast)

Bug fixes

Docker (6 fixes)

  • Auth gate UI: Dashboard and playground now load when JWT auth is active. Token input bar added to both UIs; all fetch calls use authFetch() with Bearer token. API routes remain fail-closed. (#2037)
  • Supervisord/Redis dirs: Pidfile and RDB snapshot dirs moved to writable paths for read-only rootfs deployments. (#2047, thanks @TobiasWallura-xitaso)
  • tmpfs writable: Read-only tmpfs mounts made writable. (#2027, thanks @nightcityblade)
  • FastAPI cap: Pinned FastAPI below 0.137 to avoid compatibility breakage. (#2025, thanks @nightcityblade)
  • Redis auth: Rate-limit Redis storage now authenticates with the configured password. (#2040, thanks @harshmathurx)
  • Posture tests updated: Dashboard/playground moved to public UI assertions to match auth gate fix.

Browser (2 fixes)

  • Windows channel crash: channel='chromium' (the default) caused Playwright to look for a system Chrome install instead of the bundled binary, crashing on Windows with TargetClosedError. The default channel is no longer passed to Playwright. (#2051, thanks @fstark96)
  • Context snapshot leak: Browser contexts from snapshot are now properly closed. (#1999, thanks @nightcityblade)

Core (2 fixes)

  • HTTP timeout: page_timeout (60000ms) was passed directly to aiohttp.ClientTimeout which expects seconds, making the effective timeout 16.7 hours. Now correctly divided by 1000. (#1894, thanks @hafezparast)
  • Best-first ordering: Batch ordering in BestFirstCrawlingStrategy stabilized for deterministic crawl order. (#1998, thanks @nightcityblade)

Extraction (1 fix)

  • Table attributes: html2text now preserves all attributes on table tags when bypass_tables is enabled. (#2007)

Dependencies (1 fix)

  • lxml 6.x: Widened lxml ceiling from <6 to <7 so crawl4ai can co-install with packages requiring lxml 6.x (e.g. scrapling). (#2019)

Housekeeping

  • Removed dead normalize_url duplicates and accidental adaptive_crawler copy. (thanks @RajanChavada)
  • Sponsor logos hosted locally to fix broken GitHub rendering.

Upgrade

pip install -U crawl4ai
crawl4ai-doctor  # verify installation

Docker users: pull the latest image once the Docker release workflow finishes.

Acknowledgments

Thanks to the community contributors who made this release possible: @hafezparast (#1894, #1900), @nightcityblade (#1998, #1999, #2025, #2027), @fstark96 (#2051), @TobiasWallura-xitaso (#2047), @harshmathurx (#2040), @RajanChavada (#2042).

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