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fix syntax for haproxy X-Request-Start configuration

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source: https://stackoverflow.com/questions/31036893/how-do-i-add-x-request-start-in-haproxy/50060498#50060498
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Sai Ram Kunala 2020-07-20 16:50:21 +05:30 • committed by GitHub
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docs/deployment.md
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@ -66,7 +66,8 @@ thread to become available.
* Have your upstream proxy set a header with the time it received the request:
* nginx: `proxy_set_header X-Request-Start "${msec}";`
* haproxy: `http-request set-header X-Request-Start "%t";`
* haproxy >= 1.9: `http-request set-header X-Request-Start t=%[date()]%[date_us()]`
* haproxy < 1.9: `http-request set-header X-Request-Start t=%[date()]`
* In your Rack middleware, determine the amount of time elapsed since `X-Request-Start`.
* To improve accuracy, you will want to subtract time spent waiting for slow clients:
* `env['puma.request_body_wait']` contains the number of milliseconds Puma spent