本文深入探讨了URI爬取过程中处理器链的工作原理，包括预取处理链、获取处理链、提取处理链、写入/索引处理链及后处理链，详细解析每个环节的功能与作用。
When a URI is crawled, a ToeThread will execute a series of processors on it.
The processors are split into 5 distinct chains that are exectued in sequence:
Pre-fetch processing chain
Fetch processing chain
Extractor processing chain
Write/Index processing chain
Post-processing chain
The processors are split into 5 distinct chains that are exectued in sequence:
Pre-fetch processing chain
Fetch processing chain
Extractor processing chain
Write/Index processing chain
Post-processing chain
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