Request headers:

 host: optometrie.ch
 Accept-Encoding: x-gzip, gzip, deflate
 user-agent: CCBot/2.0 (http://commoncrawl.org/faq/)
 accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
 connection: close
 content-length: 0