About this bot
YahooCacheSystem is a cache fetcher associated with Yahoo and used for search service content caching.
Primary directory identity signal: YahooCacheSystem. Representative HTTP identity: YahooCacheSystem; YahooWebServiceClient.
Directory status: Active. Identity classification: Verified with Medium confidence. Identity type: current verified identity.
robots.txt behavior is currently unconfirmed. Do not assume robots.txt alone will control this traffic.
Risk classification: Safe. Recommended handling is to evaluate the request context before allowing, rate-limiting, or blocking.
How to identify this bot
- User-agent and crawler identifiers
-
YahooCacheSystemYahooCacheSystem; YahooWebServiceClient - Also known as
- YahooWebServiceClient
Details
- Kind
- Cache fetcher
- Family
- Yahoo
- Purpose
- Search service content caching
- Common Use
- Fetching and caching public website content to support Yahoo Search and related service rendering.
- Respects robots.txt
- Unknown
Verification
- Identity Type
- current-verified-identity
- Evidence Method
- Match YahooCacheSystem/YahooWebServiceClient and corroborate with Yahoo source/network context before trust-based allowlisting.
- Detection Notes
- This identity is associated with content caching for Yahoo Search/services rather than primary web indexing.
Website controls
- Robots.txt Snippet
User-agent: YahooCacheSystem Disallow: /- Apache Rule
SetEnvIfNoCase User-Agent "YahooCacheSystem" botcrawl_match=1- Nginx Rule
if ($http_user_agent ~* "YahooCacheSystem") { set $botcrawl_match 1; }