Nginx request process time header?

Question

I'm trying to append a header inside nginx that will say something like 'X-Time: 0.06 seconds' which basically will be the time since nginx connected with the client and nginx responded to the client.

Thanks.

To what purpose? Why does this response time have to be sent to the client via HTTP headers? — alphadogg, Oct 14 '11 at 20:14
What I meant was: what was the end goal, because response processing time could be had from the logs. Why send it in a header to the client? — alphadogg, Oct 14 '11 at 23:01

quanta · Answer 1 · 2011-10-15T07:19:53.310

1

AFAIK, the short answer is you cannot. Nginx don't understand the $request_time variable if you use something like this:

add_header  X-Time '$request_time';

edited Oct 15 '11 at 07:19

answered Oct 15 '11 at 05:37

quanta

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I just checked today and that line works in current nginx :) – Mike Szyndel Jan 30 '19 at 19:39

score 1 · Accepted Answer · answered Jan 24 '13 at 15:26

From official docs: http://nginx.org/en/docs/http/ngx_http_core_module.html#var_request_time

$request_time request processing time in seconds with a milliseconds resolution (1.3.9, 1.2.6); time elapsed since the first bytes were read from the client

Since versions 1.3.9 and 1.2.6 in common variables. Before: only in ngx_http_log_module.

Nginx request process time header?

2 Answers2