Manual:$wgSorbsUrl

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HTTP proxy (CDN) settings: $wgSorbsUrl
URL to the Sorbs blacklist.
Introduced in version:1.9.0 (r17528)
Deprecated in version:1.16.0
Removed in version:1.24.0 (Gerrit change 145738; git #1163efde)
Allowed values:(string)
Default value:array() (1.16-1.23)
'http.dnsbl.sorbs.net.' (1.9-1.15)

Details[edit]

URL to the Sorbs blacklist. Used when $wgEnableSorbs is true.