CapitalIQ Interview Question for Consultants

Country: India
Interview Type: Phone Interview

Comment hidden because of low score. Click to expand.
of 7 vote

In an rough and simplified sketch, assuming the simplest possible HTTP request, no proxies and IPv4:

1. Checks link's URL part. If not empty take that URL to be feteched.
2. browser checks cache; if requested object is in cache and is fresh, skip to #9
3. browser asks OS for server's IP address
4. OS makes a DNS lookup and replies the IP address to the browser
5. browser opens a TCP connection to server (this step is much more complex with HTTPS)
6. browser sends the HTTP request through TCP connection
7. browser receives HTTP response and may close the TCP connection, or reuse it for another request
8. browser checks if the response is a redirect (3xx result status codes), authorization request (401), error (4xx and 5xx), etc.; these are handled differently from normal responses (2xx)
9. if cacheable, response is stored in cache
10. browser decodes response (e.g. if it's gzipped)
11. browser determines what to do with response (e.g. is it a HTML page, is it an image, is it a sound clip?)
12. browser renders response, or offers a download dialog for unrecognized types

There are many other things happening in parallel to this (processing typed-in address, adding page to browser history, displaying progress to user, notifying plugins and extensions, rendering the page while it's downloading, pipelining, connection tracking for keep-alive, etc.).

- coding.arya June 19, 2013 | Flag Reply
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of 0 votes


- rixcat June 20, 2013 | Flag
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of 0 votes

Very few replies I find which are actually helpful and understandable on this site and this is one of them.

- jatin085 April 20, 2014 | Flag
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of 0 vote


- Anonymous June 20, 2023 | Flag Reply

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