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crawl4ai/docs/md_v2/blog/index.md
Nasrin f6f7f1b551 Release v0.8.0: Crash Recovery, Prefetch Mode & Security Fixes (#1712) 
* Fix: Use correct URL variable for raw HTML extraction (#1116)

- Prevents full HTML content from being passed as URL to extraction strategies
- Added unit tests to verify raw HTML and regular URL processing

Fix: Wrong URL variable used for extraction of raw html

* Fix #1181: Preserve whitespace in code blocks during HTML scraping

  The remove_empty_elements_fast() method was removing whitespace-only
  span elements inside <pre> and <code> tags, causing import statements
  like "import torch" to become "importtorch". Now skips elements inside
  code blocks where whitespace is significant.

* Refactor Pydantic model configuration to use ConfigDict for arbitrary types

* Fix EmbeddingStrategy: Uncomment response handling for the variations and clean up mock data. ref #1621

* Fix: permission issues with .cache/url_seeder and other runtime cache dirs. ref #1638

* fix: ensure BrowserConfig.to_dict serializes proxy_config

* feat: make LLM backoff configurable end-to-end

- extend LLMConfig with backoff delay/attempt/factor fields and thread them
  through LLMExtractionStrategy, LLMContentFilter, table extraction, and
  Docker API handlers
- expose the backoff parameter knobs on perform_completion_with_backoff/aperform_completion_with_backoff
  and document them in the md_v2 guides

* reproduced AttributeError from #1642

* pass timeout parameter to docker client request

* added missing deep crawling objects to init

* generalized query in ContentRelevanceFilter to be a str or list

* import modules from enhanceable deserialization

* parameterized tests

* Fix: capture current page URL to reflect JavaScript navigation and add test for delayed redirects. ref #1268

* refactor: replace PyPDF2 with pypdf across the codebase. ref #1412

* Add browser_context_id and target_id parameters to BrowserConfig

Enable Crawl4AI to connect to pre-created CDP browser contexts, which is
essential for cloud browser services that pre-create isolated contexts.

Changes:
- Add browser_context_id and target_id parameters to BrowserConfig
- Update from_kwargs() and to_dict() methods
- Modify BrowserManager.start() to use existing context when provided
- Add _get_page_by_target_id() helper method
- Update get_page() to handle pre-existing targets
- Add test for browser_context_id functionality

This enables cloud services to:
1. Create isolated CDP contexts before Crawl4AI connects
2. Pass context/target IDs to BrowserConfig
3. Have Crawl4AI reuse existing contexts instead of creating new ones

* Add cdp_cleanup_on_close flag to prevent memory leaks in cloud/server scenarios

* Fix: add cdp_cleanup_on_close to from_kwargs

* Fix: find context by target_id for concurrent CDP connections

* Fix: use target_id to find correct page in get_page

* Fix: use CDP to find context by browserContextId for concurrent sessions

* Revert context matching attempts - Playwright cannot see CDP-created contexts

* Add create_isolated_context flag for concurrent CDP crawls

When True, forces creation of a new browser context instead of reusing
the default context. Essential for concurrent crawls on the same browser
to prevent navigation conflicts.

* Add context caching to create_isolated_context branch

Uses contexts_by_config cache (same as non-CDP mode) to reuse contexts
for multiple URLs with same config. Still creates new page per crawl
for navigation isolation. Benefits batch/deep crawls.

* Add init_scripts support to BrowserConfig for pre-page-load JS injection

This adds the ability to inject JavaScript that runs before any page loads,
useful for stealth evasions (canvas/audio fingerprinting, userAgentData).

- Add init_scripts parameter to BrowserConfig (list of JS strings)
- Apply init_scripts in setup_context() via context.add_init_script()
- Update from_kwargs() and to_dict() for serialization

* Fix CDP connection handling: support WS URLs and proper cleanup

Changes to browser_manager.py:

1. _verify_cdp_ready(): Support multiple URL formats
   - WebSocket URLs (ws://, wss://): Skip HTTP verification, Playwright handles directly
   - HTTP URLs with query params: Properly parse with urlparse to preserve query string
   - Fixes issue where naive f"{cdp_url}/json/version" broke WS URLs and query params

2. close(): Proper cleanup when cdp_cleanup_on_close=True
   - Close all sessions (pages)
   - Close all contexts
   - Call browser.close() to disconnect (doesn't terminate browser, just releases connection)
   - Wait 1 second for CDP connection to fully release
   - Stop Playwright instance to prevent memory leaks

This enables:
- Connecting to specific browsers via WS URL
- Reusing the same browser with multiple sequential connections
- No user wait needed between connections (internal 1s delay handles it)

Added tests/browser/test_cdp_cleanup_reuse.py with comprehensive tests.

* Update gitignore

* Some debugging for caching

* Add _generate_screenshot_from_html for raw: and file:// URLs

Implements the missing method that was being called but never defined.
Now raw: and file:// URLs can generate screenshots by:
1. Loading HTML into a browser page via page.set_content()
2. Taking screenshot using existing take_screenshot() method
3. Cleaning up the page afterward

This enables cached HTML to be rendered with screenshots in crawl4ai-cloud.

* Add PDF and MHTML support for raw: and file:// URLs

- Replace _generate_screenshot_from_html with _generate_media_from_html
- New method handles screenshot, PDF, and MHTML in one browser session
- Update raw: and file:// URL handlers to use new method
- Enables cached HTML to generate all media types

* Add crash recovery for deep crawl strategies

Add optional resume_state and on_state_change parameters to all deep
crawl strategies (BFS, DFS, Best-First) for cloud deployment crash
recovery.

Features:
- resume_state: Pass saved state to resume from checkpoint
- on_state_change: Async callback fired after each URL for real-time
  state persistence to external storage (Redis, DB, etc.)
- export_state(): Get last captured state manually
- Zero overhead when features are disabled (None defaults)

State includes visited URLs, pending queue/stack, depths, and
pages_crawled count. All state is JSON-serializable.

* Fix: HTTP strategy raw: URL parsing truncates at # character

The AsyncHTTPCrawlerStrategy.crawl() method used urlparse() to extract
content from raw: URLs. This caused HTML with CSS color codes like #eee
to be truncated because # is treated as a URL fragment delimiter.

Before: raw:body{background:#eee} -> parsed.path = 'body{background:'
After:  raw:body{background:#eee} -> raw_content = 'body{background:#eee'

Fix: Strip the raw: or raw:// prefix directly instead of using urlparse,
matching how the browser strategy handles it.

* Add base_url parameter to CrawlerRunConfig for raw HTML processing

When processing raw: HTML (e.g., from cache), the URL parameter is meaningless
for markdown link resolution. This adds a base_url parameter that can be set
explicitly to provide proper URL resolution context.

Changes:
- Add base_url parameter to CrawlerRunConfig.__init__
- Add base_url to CrawlerRunConfig.from_kwargs
- Update aprocess_html to use base_url for markdown generation

Usage:
  config = CrawlerRunConfig(base_url='https://example.com')
  result = await crawler.arun(url='raw:{html}', config=config)

* Add prefetch mode for two-phase deep crawling

- Add `prefetch` parameter to CrawlerRunConfig
- Add `quick_extract_links()` function for fast link extraction
- Add short-circuit in aprocess_html() for prefetch mode
- Add 42 tests (unit, integration, regression)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Updates on proxy rotation and proxy configuration

* Add proxy support to HTTP crawler strategy

* Add browser pipeline support for raw:/file:// URLs

- Add process_in_browser parameter to CrawlerRunConfig
- Route raw:/file:// URLs through _crawl_web() when browser operations needed
- Use page.set_content() instead of goto() for local content
- Fix cookie handling for non-HTTP URLs in browser_manager
- Auto-detect browser requirements: js_code, wait_for, screenshot, etc.
- Maintain fast path for raw:/file:// without browser params

Fixes #310

* Add smart TTL cache for sitemap URL seeder

- Add cache_ttl_hours and validate_sitemap_lastmod params to SeedingConfig
- New JSON cache format with metadata (version, created_at, lastmod, url_count)
- Cache validation by TTL expiry and sitemap lastmod comparison
- Auto-migration from old .jsonl to new .json format
- Fixes bug where incomplete cache was used indefinitely

* Update URL seeder docs with smart TTL cache parameters

- Add cache_ttl_hours and validate_sitemap_lastmod to parameter table
- Document smart TTL cache validation with examples
- Add cache-related troubleshooting entries
- Update key features summary

* Add MEMORY.md to gitignore

* Docs: Add multi-sample schema generation section

Add documentation explaining how to pass multiple HTML samples
to generate_schema() for stable selectors that work across pages
with varying DOM structures.

Includes:
- Problem explanation (fragile nth-child selectors)
- Solution with code example
- Key points for multi-sample queries
- Comparison table of fragile vs stable selectors

* Fix critical RCE and LFI vulnerabilities in Docker API deployment

Security fixes for vulnerabilities reported by ProjectDiscovery:

1. Remote Code Execution via Hooks (CVE pending)
   - Remove __import__ from allowed_builtins in hook_manager.py
   - Prevents arbitrary module imports (os, subprocess, etc.)
   - Hooks now disabled by default via CRAWL4AI_HOOKS_ENABLED env var

2. Local File Inclusion via file:// URLs (CVE pending)
   - Add URL scheme validation to /execute_js, /screenshot, /pdf, /html
   - Block file://, javascript:, data: and other dangerous schemes
   - Only allow http://, https://, and raw: (where appropriate)

3. Security hardening
   - Add CRAWL4AI_HOOKS_ENABLED=false as default (opt-in for hooks)
   - Add security warning comments in config.yml
   - Add validate_url_scheme() helper for consistent validation

Testing:
   - Add unit tests (test_security_fixes.py) - 16 tests
   - Add integration tests (run_security_tests.py) for live server

Affected endpoints:
   - POST /crawl (hooks disabled by default)
   - POST /crawl/stream (hooks disabled by default)
   - POST /execute_js (URL validation added)
   - POST /screenshot (URL validation added)
   - POST /pdf (URL validation added)
   - POST /html (URL validation added)

Breaking changes:
   - Hooks require CRAWL4AI_HOOKS_ENABLED=true to function
   - file:// URLs no longer work on API endpoints (use library directly)

* Enhance authentication flow by implementing JWT token retrieval and adding authorization headers to API requests

* Add release notes for v0.7.9, detailing breaking changes, security fixes, new features, bug fixes, and documentation updates

* Add release notes for v0.8.0, detailing breaking changes, security fixes, new features, bug fixes, and documentation updates

Documentation for v0.8.0 release:

- SECURITY.md: Security policy and vulnerability reporting guidelines
- RELEASE_NOTES_v0.8.0.md: Comprehensive release notes
- migration/v0.8.0-upgrade-guide.md: Step-by-step migration guide
- security/GHSA-DRAFT-RCE-LFI.md: GitHub security advisory drafts
- CHANGELOG.md: Updated with v0.8.0 changes

Breaking changes documented:
- Docker API hooks disabled by default (CRAWL4AI_HOOKS_ENABLED)
- file:// URLs blocked on Docker API endpoints

Security fixes credited to Neo by ProjectDiscovery

* Add examples for deep crawl crash recovery and prefetch mode in documentation

* Release v0.8.0: The v0.8.0 Update

- Updated version to 0.8.0
- Added comprehensive demo and release notes
- Updated all documentation

* Update security researcher acknowledgment with a hyperlink for Neo by ProjectDiscovery

* Add async agenerate_schema method for schema generation

- Extract prompt building to shared _build_schema_prompt() method
- Add agenerate_schema() async version using aperform_completion_with_backoff
- Refactor generate_schema() to use shared prompt builder
- Fixes Gemini/Vertex AI compatibility in async contexts (FastAPI)

* Fix: Enable litellm.drop_params for O-series/GPT-5 model compatibility

O-series (o1, o3) and GPT-5 models only support temperature=1.
Setting litellm.drop_params=True auto-drops unsupported parameters
instead of throwing UnsupportedParamsError.

Fixes temperature=0.01 error for these models in LLM extraction.

---------

Co-authored-by: rbushria <rbushri@gmail.com>
Co-authored-by: AHMET YILMAZ <tawfik@kidocode.com>
Co-authored-by: Soham Kukreti <kukretisoham@gmail.com>
Co-authored-by: Chris Murphy <chris.murphy@klaviyo.com>
Co-authored-by: unclecode <unclecode@kidocode.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-17 14:19:15 +01:00

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# Crawl4AI Blog
Welcome to the Crawl4AI blog! Here you'll find detailed release notes, technical insights, and updates about the project. Whether you're looking for the latest improvements or want to dive deep into web crawling techniques, this is the place.
## Featured Articles
### [When to Stop Crawling: The Art of Knowing "Enough"](articles/adaptive-crawling-revolution.md)
*January 29, 2025*
Traditional crawlers are like tourists with unlimited time—they'll visit every street, every alley, every dead end. But what if your crawler could think like a researcher with a deadline? Discover how Adaptive Crawling revolutionizes web scraping by knowing when to stop. Learn about the three-layer intelligence system that evaluates coverage, consistency, and saturation to build focused knowledge bases instead of endless page collections.
[Read the full article →](articles/adaptive-crawling-revolution.md)
### [The LLM Context Protocol: Why Your AI Assistant Needs Memory, Reasoning, and Examples](articles/llm-context-revolution.md)
*January 24, 2025*
Ever wondered why your AI coding assistant struggles with your library despite comprehensive documentation? This article introduces the three-dimensional context protocol that transforms how AI understands code. Learn why memory, reasoning, and examples together create wisdom—not just information.
[Read the full article →](articles/llm-context-revolution.md)
## Latest Release
### [Crawl4AI v0.8.0 – Crash Recovery & Prefetch Mode](../blog/release-v0.8.0.md)
*January 2026*
Crawl4AI v0.8.0 introduces crash recovery for deep crawls, a new prefetch mode for fast URL discovery, and critical security fixes for Docker deployments.
Key highlights:
- **🔄 Deep Crawl Crash Recovery**: `on_state_change` callback for real-time state persistence, `resume_state` to continue from checkpoints
- **⚡ Prefetch Mode**: `prefetch=True` for 5-10x faster URL discovery, perfect for two-phase crawling patterns
- **🔒 Security Fixes**: Hooks disabled by default, `file://` URLs blocked on Docker API, `__import__` removed from sandbox
[Read full release notes →](../blog/release-v0.8.0.md)
## Recent Releases
### [Crawl4AI v0.7.8 – Stability & Bug Fix Release](../blog/release-v0.7.8.md)
*December 2025*
Crawl4AI v0.7.8 is a focused stability release addressing 11 bugs reported by the community. Fixes for Docker deployments, LLM extraction, URL handling, and dependency compatibility.
Key highlights:
- **🐳 Docker API Fixes**: ContentRelevanceFilter deserialization, ProxyConfig serialization, cache folder permissions
- **🤖 LLM Improvements**: Configurable rate limiter backoff, HTML input format support
- **📦 Dependencies**: Replaced deprecated PyPDF2 with pypdf, Pydantic v2 ConfigDict compatibility
[Read full release notes →](../blog/release-v0.7.8.md)
### [Crawl4AI v0.7.7 – The Self-Hosting & Monitoring Update](../blog/release-v0.7.7.md)
*November 14, 2025*
Crawl4AI v0.7.7 transforms Docker into a complete self-hosting platform with enterprise-grade real-time monitoring, comprehensive observability, and full operational control.
Key highlights:
- **📊 Real-time Monitoring Dashboard**: Interactive web UI with live system metrics
- **🔌 Comprehensive Monitor API**: Complete REST API for programmatic access
- **⚡ WebSocket Streaming**: Real-time updates every 2 seconds
- **🔥 Smart Browser Pool**: 3-tier architecture with automatic promotion and cleanup
[Read full release notes →](../blog/release-v0.7.7.md)
### [Crawl4AI v0.7.6 – The Webhook Infrastructure Update](../blog/release-v0.7.6.md)
*October 22, 2025*
Crawl4AI v0.7.6 introduces comprehensive webhook support for the Docker job queue API, bringing real-time notifications to both crawling and LLM extraction workflows.
Key highlights:
- **🪝 Complete Webhook Support**: Real-time notifications for both `/crawl/job` and `/llm/job` endpoints
- **🔄 Reliable Delivery**: Exponential backoff retry mechanism
- **🔐 Custom Authentication**: Add custom headers for webhook authentication
[Read full release notes →](../blog/release-v0.7.6.md)
---
## Older Releases
| Version | Date | Highlights |
|---------|------|------------|
| [v0.7.5](../blog/release-v0.7.5.md) | September 2025 | Docker Hooks System, enhanced LLM integration, HTTPS preservation |
| [v0.7.4](../blog/release-v0.7.4.md) | August 2025 | LLM-powered table extraction, performance improvements |
| [v0.7.3](../blog/release-v0.7.3.md) | July 2025 | Undetected browser, multi-URL config, memory monitoring |
| [v0.7.1](../blog/release-v0.7.1.md) | June 2025 | Bug fixes and stability improvements |
| [v0.7.0](../blog/release-v0.7.0.md) | May 2025 | Adaptive crawling, virtual scroll, link analysis |
## Project History
Curious about how Crawl4AI has evolved? Check out our [complete changelog](https://github.com/unclecode/crawl4ai/blob/main/CHANGELOG.md) for a detailed history of all versions and updates.
## Stay Updated
- Star us on [GitHub](https://github.com/unclecode/crawl4ai)
- Follow [@unclecode](https://twitter.com/unclecode) on Twitter
- Join our community discussions on GitHub
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