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feat(crawl4ai): Implement SMART cache mode

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This commit introduces a new cache mode, SMART, to the crawl4ai library. The SMART mode intelligently validates cached content using HEAD requests before using it, saving significant bandwidth while ensuring fresh content. The changes include modifications to the async_webcrawler.py, cache_context.py, and utils.py files in the crawl4ai directory. The async_webcrawler.py file now includes a check for the SMART cache mode and performs a HEAD check to see if the content has changed. If the content has changed, the url is re-crawled; otherwise, the cached result is used. The cache_context.py and utils.py files have been updated to support these changes.

The documentation has also been updated to reflect these changes. The cache-modes.md file now includes a detailed explanation of the SMART mode, its logs, limitations, and an advanced example. The examples.md file now includes a link to the SMART Cache Mode example. The quickstart.md file now mentions the SMART mode in the note about cache modes.

These changes improve the efficiency of the crawl4ai library by reducing unnecessary re-crawling and bandwidth usage.

BREAKING CHANGE: The introduction of the SMART cache mode may affect existing code that uses the crawl4ai library and does not expect this new mode. Users should review the updated documentation to understand how to use this new mode.
This commit is contained in:
UncleCode
2025-07-21 21:19:37 +08:00
parent 8a04351406
commit d1de82a332
11 changed files with 1139 additions and 29 deletions
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docs/md_v2/core/quickstart.md
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@@ -79,7 +79,7 @@ if __name__ == "__main__":
asyncio.run(main())
```
> IMPORTANT: By default cache mode is set to `CacheMode.ENABLED`. So to have fresh content, you need to set it to `CacheMode.BYPASS`
> IMPORTANT: By default cache mode is set to `CacheMode.ENABLED`. So to have fresh content, you need to set it to `CacheMode.BYPASS`. For intelligent caching that validates content before using cache, use the new `CacheMode.SMART` - it saves bandwidth while ensuring fresh content.
We’ll explore more advanced config in later tutorials (like enabling proxies, PDF output, multi-tab sessions, etc.). For now, just note how you pass these objects to manage crawling.