=== HTTP code : 200 ===

Response headers
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HTTP/1.1 301 Moved Permanently
Date: Tue, 13 Feb 2018 18:00:42 GMT
Server: Apache/2.4.7 (Ubuntu)
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Cache-Control: max-age=1
Expires: Tue, 13 Feb 2018 18:00:43 GMT
Connection: close
Content-Type: text/html; charset=iso-8859-1

HTTP/1.1 200 OK
Date: Tue, 13 Feb 2018 18:00:42 GMT
Server: Apache-Coyote/1.1
Set-Cookie: plos-device-detected=desktop; path=/; domain=.journals.plos.org; expires=Tue, 13-Feb-2018 20:00:42 GMT
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Connection: close

Request headers
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HEAD /plosone/article?id=10.1371/journal.pone.0077056 HTTP/1.1
Host: journals.plos.org
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Accept: */*
Referer: http://51.15.134.16
Connection: close


Link is valid.