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Jay Caines-Gooby
2019-03-26 15:42:04 +00:00
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# Introduction
Measures [time-to-first-byte](https://en.wikipedia.org/wiki/Time_to_first_byte) for single or multiple URLs. Can calculate min, max & median TTFB values and log all response headers.
```
Usage: ttfb [options] url [url...]
-d debug
-l <log file> (infers -d)
-n number of times to test
```
Uses the calculation `%{time_starttransfer¹} - %{time_appconnect²}` which doesn't include any connection overhead, to better approximate devtool’s TTFB figure.
¹ [`time_starttransfer`](https://github.com/curl/curl/blob/e431daf013ea04cb1a988a2009d820224ef5fb79/docs/cmdline-opts/write-out.d#L141-L144)
> The time, in seconds, it took from the start until the first byte was just about to be transferred. This includes time_pretransfer and also the time the server needed to calculate the result.</blockquote>
² [`time_appconnect`](https://github.com/curl/curl/blob/e431daf013ea04cb1a988a2009d820224ef5fb79/docs/cmdline-opts/write-out.d#L118-L120)
>The time, in seconds, it took from the start until the SSL/SSH/etc
connect/handshake to the remote host was completed.
# Genesis
Based on a gist https://gist.github.com/sandeepraju/1f5fbdbdd89551ba7925abe2645f92b5 Based on a gist https://gist.github.com/sandeepraju/1f5fbdbdd89551ba7925abe2645f92b5
by https://github.com/sandeepraju by https://github.com/sandeepraju
Modified by jay@gooby.org, [@jaygooby](https://twitter.com/jaygooby) Modified by jay@gooby.org, [@jaygooby](https://twitter.com/jaygooby)
# Usage
``` ```
Usage: ttfb [options] url [url...] Usage: ttfb [options] url [url...]
-d debug -d debug
@@ -30,8 +53,8 @@ news.bbc.co.uk min .032927 max .032237 median .037458
``` ```
$ ttfb bbc.co.uk news.bbc.co.uk $ ttfb bbc.co.uk news.bbc.co.uk
bbc.co.uk DNS lookup: 0.005291 TLS handshake: 0.089403 TTFB including nnection: 0.119651 TTFB: .030248 Total time: 0.506010 bbc.co.uk DNS lookup: 0.005291 TLS handshake: 0.089403 TTFB including connection: 0.119651 TTFB: .030248 Total time: 0.506010
news.bbc.co.uk DNS lookup: 0.004266 TLS handshake: 0.077179 TTFB including nnection: 0.110649 TTFB: .033470 Total time: 0.598472 news.bbc.co.uk DNS lookup: 0.004266 TLS handshake: 0.077179 TTFB including connection: 0.110649 TTFB: .033470 Total time: 0.598472
``` ```
Implicitly follows redirects using curl's `-L` Implicitly follows redirects using curl's `-L`
@@ -62,9 +85,15 @@ the transfer.
![Diagram showing what each of the curl variable timings refer to against a typical HTTP over TLS 1.2 connection](https://blog.cloudflare.com/content/images/2018/10/Screen-Shot-2018-10-16-at-14.51.29-1.png) ![Diagram showing what each of the curl variable timings refer to against a typical HTTP over TLS 1.2 connection](https://blog.cloudflare.com/content/images/2018/10/Screen-Shot-2018-10-16-at-14.51.29-1.png)
To get a better approximation of devtool's TTFB, consider To get a better approximation of devtool's TTFB, we consider
the time without the connection overhead: the time without the connection overhead:
`%{time_starttransfer} - %{time_appconnect}` `%{time_starttransfer} - %{time_appconnect}`
Uses a dirty `eval` to do the ttfb arithmetic. Depends Uses a dirty `eval` to do the ttfb arithmetic. Depends
on `bc` and `column` commands. on `bc` and `column` commands.
# TODO
* [ ] Sort output by fasted TTFB when multiple URLs are supplied
* [ ] Colour code the `TTFB:` figure in the standard response, according to the speed of the response.