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explain-what-happens-when-you-type-domain-in-the-browser-and-press-enter.md

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Explain what happens when you type domain in the browser and press enter

  • Resolve IP address of the URL via DNS
  • Generate an HTTP request with headers (accept, user-agent, cookie, etc)
  • Open an HTTP connection to the resolved IP address
  • Send the request to the server
  • Receive the response from the server
  • Parse response headers
  • Depending on the response headers, perform additional operations
  • Decompress the response body if it's compressed (e.g. gzipped)
  • Parse the HTML code inside the response body
  • Resolve any additional resources (images, stylesheets, scripts, etc)
  • Start loading those resources via their URLs using the same steps
  • Render the HTML as soon as required resources are loaded, continue loading remaining resources in background
  • When all the resources are loaded, close the HTTP connection