=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
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Date: Tue, 13 Feb 2018 19:00:44 GMT
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Request headers
================
HEAD /groups/africanlanguages/ HTTP/1.1
Host: www.facebook.com
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Accept: */*
Referer: http://51.15.134.16
Connection: close


Link is valid.