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Responsive Weiterleitungen und "Vary HTTP header" um Google-Ban zu vermeiden

Jeder Webmaster weiss es, Google mag Duplicate-Content überhaupt nicht. Aber was machen wir, wenn wir für Smartphone-Users andere und für Tablet User andere und für PC-Users andere Sites mit gleichen Content haben?

Die Lösung ist "HTTP header: Vary" und rel="alternate".

Mehr dazu gibt es offiziell hier:
https://developers.google.com/webmasters/smartphone-sites/redirects

Ein Beispiel :

GET /meine-unter-seite-1 HTTP/1.1
Host: www.itlantik.de
User-Agent: Mozilla/4.0 (Firefox ...

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