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marcogbarcellos/what_happens_if_you_type_website_on_browser.md

Created March 21, 2017 01:35
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What happens if you type http://abcdef.com
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what_happens_if_you_type_website_on_browser.md
  • browser looks for the DNS cache
  • browser ask the OS to find the ip
  • OS makes a DNS lookup to find the ip and gives to the browser * Looks for the closest DNS Server to find the IP, if it's not there the DNS Server looks for another DNS Server until finds it
  • OS caches the IP
  • browser opens a tcp connection( If it's HTTPS this step is waay more complicated)
  • browser sends an http request
  • browser receives an http response and may close the connection or reuse for more requests.
  • browser checks what kind of response se he receives: 3xx redirect or conditional, 401 authorization required, 4xx and 5xx errors or 2xx "good" responses
  • If cacheable, browser caches response
  • Browser determine what it'll do with the response(html, image) and either render a page or offer the content for download

Detailed answer

Complete answer with all the details: https://github.com/alex/what-happens-when

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