title: how nginx know from which site i was redirected to my site?
body: <p>I was checking my nginx access.log and  I found bellow info.
  From there is showing my redirection task: redirect to my site webcovid19.live from another portal sme.sk
  How is this possible ? Is it hidden somewhere in HTML protocol ?
  How webserver knows about redirection ?
  Use Google Analytics the same logic ?  direct vs referral</p>
  
  <pre><code>85.216.x.x - - [24/May/2020:08:50:52 +0000] "GET / HTTP/1.1" 200 1358 "https://domov.sme.sk/diskusie/3671287/2/koronavirus-
  slovensko-minuta-po-minute-23-maj-2020.html" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:76.0) Gecko/20100101 Firefox/76.0"
  85.216.x.x - - [24/May/2020:08:50:52 +0000] "GET /styles.css HTTP/1.1" 200 725 "https://webcovid19.live/" "Mozilla/5.0 (X11
  ; Ubuntu; Linux x86_64; rv:76.0) Gecko/20100101 Firefox/76.0"
  </code></pre>