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Understanding Time Values ​​from Charles Debugging Proxy

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This image from Charles shows some pretty interesting information:

  • Duration
  • Request duration
  • Response Duration
  • Delay

I would like to better understand what these terms really mean.

That is, how does Charles measure the duration of the request? (During the HTTP transaction, is this from time to time by then?) Similarly for the response.

In addition, request + response != Duration. Is there any server-side processing time left?

What is latency here?

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From the documentation :

  • Request - time spent on sending (loading) the request (dark blue)
  • - ( )
  • - , () (-)
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