Vi skal lave en tutorial der forklarer http headers, f.eks:
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date: fri, 23 oct 2015 06:51:57 gmt

server: apache/2.2.16 (debian) mod_ssl/2.2.16 openssl/0.9.8o

last-modified: fri, 23 oct 2015 06:51:50 gmt

etag: "20bcaf6-84a-522c00bc3cd80"

accept-ranges: bytes

vary: accept-encoding

content-encoding: gzip

content-length: 907

content-type: text/html; charset=utf-8

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