Uncategorized

Lifecycle of a URL access on a Browser

Step 1

  • DNS lookup
    • Browser cache
    • OS cache
    • Router cache
    • ISP DNS lookup

Step 2

  • Connection setup
    • 3 phase TCP connection

Step 3

  • Browser sends HTTP request
    • GET
    • POST (for auth and form submission)

Step 4

  • Server handles the request and prepares a response.
    • Server could be a web server (Apache, IIS)
    • Handler parses the request header
    • Handler can be coded on ASP, PHP etc.

Step 5

  • Server responds with HTTP header having status code

Step 6

  • Browser gets HTML data
  • It renders tags
  • Fetches images, CSS using GET (usually cached)

Written with StackEdit.

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Categories: Uncategorized

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