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time.to_first_byte

The time interval since the request started up to the point before the vcl_deliver function ran. When used in a string context, an RTIME variable like this one will be formatted as a number in seconds with 3 decimal digits of precision. In vcl_deliver this interval will be very close to time.elapsed. In vcl_log, the difference between time.elapsed and time.to_first_byte will be the time that it took to send the response body.

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