=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Connection: close
Date: Tue, 03 Jan 2017 19:08:24 GMT
Server: Apache
Vary: Accept-Encoding
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 0
X-Cache: Miss from cloudfront
Via: 1.1 9aac77db976fd4f008caa822737485da.cloudfront.net (CloudFront)
X-Amz-Cf-Id: CoAhHEBXbnfHi8kfLxVyJQzrTNerD7GjRrIx9DNp0pmU_GcAw-0sqQ==

Request headers
================
HEAD / HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: slack.com
Accept: */*
Referer: https://mompreneurs.de
Connection: close


Link is valid.